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65-591: The Southwest Washington Regional Transportation Council ( SWRTC ) is the metropolitan planning organization for southwestern Washington state , including parts of the Portland, Oregon metropolitan area . It oversees long-range planning and transportation funding for Clark , Klickitat , and Skamania counties. SWRTC was established in 1992 under the provisions of the 1990 Washington State Growth Management Act . This article about transportation in Washington

130-501: A compilation of air pollutant emission factors for a wide range of industrial sources. The United Kingdom, Australia, Canada, and many other countries have published similar compilations, as well as the European Environment Agency . An air pollutant is a material in the air that can have many effects on humans and the ecosystem. The substance can be solid particles, liquid droplets, or gases, and often takes

195-768: A faster rate of breathing than a child engaged in sedentary activity. The daily exposure must therefore include the amount of time spent in each micro-environmental setting as well as the kind of activities performed there. The air pollutant concentration in each microactivity/microenvironmental setting is summed to indicate the exposure. For some pollutants such as black carbon , traffic related exposures may dominate total exposure despite short exposure times since high concentrations coincide with proximity to major roads or participation in (motorized) traffic. A large portion of total daily exposure occurs as short peaks of high concentrations, but it remains unclear how to define peaks and determine their frequency and health impact. In 2021,

260-657: A health environment is not maintained. Even at levels lower than those considered safe by United States regulators, exposure to three components of air pollution, fine particulate matter, nitrogen dioxide and ozone, correlates with cardiac and respiratory illness. Individual reactions to air pollutants depend on the type of pollutant a person is exposed to, the degree of exposure, and the individual's health status and genetics. The most common sources of air pollution include particulates and ozone (often from burning fossil fuels), nitrogen dioxide, and sulfur dioxide. Children aged less than five years who live in developing countries are

325-562: A legal definition of air pollution, 31 percent lack outdoor air quality standards, 49 percent restrict their definition to outdoor pollution only, and just 31 percent have laws for tackling pollution originating from outside their borders. National air quality laws have often been highly effective, notably the 1956 Clean Air Act in Britain and the US Clean Air Act , introduced in 1963. Some of these efforts have been successful at

390-482: A link between air pollution levels and longevity. The WHO estimates that in 2016, ~58% of outdoor air pollution-related premature deaths were due to ischaemic heart disease and stroke. The mechanisms linking air pollution to increased cardiovascular mortality are uncertain, but probably include pulmonary and systemic inflammation. India and China have the highest death rate due to air pollution. India also has more deaths from asthma than any other nation according to

455-452: A major conceptual shift for many MPOs (and others in the planning community), since the imposition of fiscal discipline on plans now required, not only understanding how much money might be available, but how to prioritize investment needs and make difficult choices among competing needs. Adding to this complexity is the need to plan across transportation modes and develop approaches for multimodal investment prioritization and decision making. It

520-415: A mixture of natural and human sources. There are also sources from processes other than combustion : Air pollutant emission factors are reported representative values that aim to link the quantity of a pollutant released into the ambient air to an activity connected with that pollutant's release. The weight of the pollutant divided by a unit weight, volume, distance, or time of the activity generating

585-426: A spectrum of clinical disorders that include emphysema , bronchiectasis , and chronic bronchitis . COPD risk factors are both genetic and environmental. Elevated particle pollution contributes to the exacerbation of this disease and likely its pathogenesis. The risk of lung disease from air pollution is greatest for infants and young children, whose normal breathing is faster than that of older children and adults;

650-566: A total of 460,000 deaths in the US were attributed to coal PM 2.5 . The largest cause of air pollution is fossil fuel combustion  – mostly the production and use of cars , electricity production, and heating. There are estimated 4.5 million annual premature deaths worldwide due to pollutants released by high-emission power stations and vehicle exhausts. Diesel exhaust (DE) is a major contributor to combustion-derived particulate matter air pollution. In several human experimental studies, using

715-400: A variety of committees as well as a professional staff. The "policy committee" is the top-level decision-making body for the planning organization. In most MPOs, the policy committee comprises: With only a few unique exceptions nationwide, MPO policy committee members are not elected directly by citizens. Rather, a policy committee member typically is an elected or appointed official of one of

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780-794: A well-validated exposure chamber setup, DE has been linked to acute vascular dysfunction and increased thrombus formation. A study concluded that PM 2.5 air pollution induced by the contemporary free trade and consumption by the 19 G20 nations causes two million premature deaths annually, suggesting that the average lifetime consumption of about ~28 people in these countries causes at least one premature death (average age ~67) while developing countries "cannot be expected" to implement or be able to implement countermeasures without external support or internationally coordinated efforts. The US EPA has estimated that limiting ground-level ozone concentration to 65 parts per billion (ppb), would avert 1,700 to 5,100 premature deaths nationwide in 2020 compared with

845-494: A year and fine particulate (PM 2.5 ) pollution around another 2.1 million. The scope of the air pollution crisis is large: In 2018, WHO estimated that "9 out of 10 people breathe air containing high levels of pollutants." Although the health consequences are extensive, the way the problem is handled is considered largely haphazard or neglected. The World Bank has estimated that welfare losses (premature deaths) and productivity losses (lost labour) caused by air pollution cost

910-439: Is a stub . You can help Misplaced Pages by expanding it . Metropolitan planning organization Purposes of MPOs: In other words, the federal government requires that federal transportation funds be allocated to regions in a manner that has a basis in metropolitan plans developed through intergovernmental collaboration, rational analysis, and consensus-based decision making. Typically, an MPO governance structure includes

975-510: Is a significant risk factor for a number of pollution-related diseases , including respiratory infections , heart disease , chronic obstructive pulmonary disease (COPD), stroke , and lung cancer . Growing evidence suggests that air pollution exposure may be associated with reduced IQ scores, impaired cognition, increased risk for psychiatric disorders such as depression and detrimental perinatal health. The human health effects of poor air quality are far reaching, but principally affect

1040-851: Is associated with nearly one in three strokes (29%) worldwide (33.7% of strokes in developing countries versus 10.2% in developed countries). In women, air pollution is not associated with hemorrhagic but with ischemic stroke. Air pollution was found to be associated with increased incidence and mortality from coronary stroke. Associations are believed to be causal and effects may be mediated by vasoconstriction, low-grade inflammation and atherosclerosis . Other mechanisms such as autonomic nervous system imbalance have also been suggested. Research has demonstrated increased risk of developing asthma and chronic obstructive pulmonary disease (COPD) from increased exposure to traffic-related air pollution. Air pollution has been associated with increased hospitalization and mortality from asthma and COPD. COPD comprises

1105-698: Is in this context of greater prominence, funding, and requirements that MPOs function today. An annual element is composed of transportation improvement projects contained in an area's transportation improvement program (TIP), which is proposed for implementation during the current year. The annual element is submitted to the U.S. Department of Transportation as part of the required planning process. The passage of Safe, Accountable, Flexible, Efficient Transportation Equity Act: A Legacy for Users SAFETEA-LU in 2005 created new and revised requirements for transportation planning and programs. Although SAFETEA-LU increased standards, most MPOs already were in compliance with

1170-459: Is introduced with the use of air fresheners , incense , and other scented items. Controlled wood fires in cook stoves and fireplaces can add significant amounts of harmful smoke particulates into the air, inside and out. Indoor pollution fatalities may be caused by using pesticides and other chemical sprays indoors without proper ventilation. Also the kitchen in a modern produce harmful particles and gases, with equipment like toasters being one of

1235-673: Is nitrogen dioxide and other nitrogen oxides (NOx) emitted by road vehicles. Across the European Union , air pollution is estimated to reduce life expectancy by almost nine months. In a 2015 consultation document the UK government disclosed that nitrogen dioxide is responsible for 23,500 premature UK deaths per annum. There is a positive correlation between pneumonia -related deaths and air pollution from motor vehicle emissions in England. Eliminating energy-related fossil fuel emissions in

1300-515: Is one of the key roles that the technical committee supports. The technical committee typically comprises staff-level officials of local, state, and federal agencies. In addition, a technical committee may include representatives of interest groups, various transportation modes, and local citizens. A 2005 survey of MPOs nationally commissioned in preparation of "Special Report 288" of the Transportation Research Board of

1365-408: Is strong evidence linking both short- and long-term exposure to air pollution with cardiovascular disease mortality and morbidity, stroke, blood pressure, and ischemic heart diseases (IHD). Air pollution is a leading risk factor for stroke, particularly in developing countries where pollutant levels are highest. A systematic analysis of 17 different risk factors in 188 countries found air pollution

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1430-882: The Metropolitan Council is the MPO. An example of a medium-sized MPO is the Lexington Area MPO in Kentucky . An example of a small MPO is the Kittery Area MPO in Maine . Another MPO planning organization has developed in the area of western central Florida . Several MPOs there, with governance over eight counties, have developed a greater regional planning committee, the Chairs Coordinating Committee (CCC), composed of

1495-751: The National Academies found that "forecast by negotiation" was a common method of projecting future population and employment growth for use in travel forecasting , suggesting rent-seeking behavior on the part of MPO committees influencing the technical staff. Usually MPOs retain a core professional staff in order to ensure the ability to carry out the required metropolitan planning process in an effective and expeditious manner. The size and qualifications of this staff may vary by MPO, since no two metropolitan areas have identical planning needs Most MPOs, however, require at least some staff dedicated solely to MPO process oversight and management because of

1560-454: The world economy $ 5 trillion per year. The costs of air pollution are generally an externality to the contemporary economic system and most human activity, although they are sometimes recovered through monitoring, legislation, and regulation . Many different technologies and strategies are available for reducing air pollution. Although a majority of countries have air pollution laws , according to UNEP , 43 percent of countries lack

1625-544: The 75 ppb standard. The agency projected the more protective standard would also prevent an additional 26,000 cases of aggravated asthma, and more than a million cases of missed work or school. Following this assessment, the EPA acted to protect public health by lowering the National Ambient Air Quality Standards (NAAQS) for ground-level ozone to 70 ppb. A 2008 economic study of

1690-989: The American Lung Association; the US Consumer Product Safety Commission (CPSC) 2012; and the US Environmental Protection Agency 2012a. Indoor contaminants that can cause pollution include asbestos, biologic agents, building materials, radon, tobacco smoke, and wood stoves, gas ranges, or other heating systems. Radon (Rn) gas, a carcinogen , is exuded from the Earth in certain locations and trapped inside houses. Building materials including carpeting and plywood emit formaldehyde (H-CHO) gas. Paint and solvents give off volatile organic compounds (VOCs) as they dry. Lead paint can degenerate into dust and be inhaled. Intentional air pollution

1755-625: The MPO's constituent local jurisdictions. The policy committee member thus has legal authority to speak and act on behalf of that jurisdiction in the MPO setting. Federal law, however, does not require members of an MPO policy committee to be representatives of the metropolitan areas' populations. Systematic studies have found that MPO policy committees' representations of urban municipalities and disadvantaged minority populations in their areas are less than proportional to population. The policy committee's responsibilities include debating and making decisions on key MPO actions and issues, including adoption of

1820-631: The USA under the Clean Air Act and in Europe under numerous directives (including the Air "Framework" Directive, 96/62/EC, on ambient air quality assessment and management, Directive 98/24/EC, on risks related to chemical agents at work, and Directive 2004/107/EC covering heavy metals and polycyclic aromatic hydrocarbons in ambient air). The risk of air pollution is determined by the pollutant's hazard and

1885-567: The United States would prevent 46,900–59,400 premature deaths each year and provide $ 537–$ 678 billion in benefits from avoided PM 2.5 -related illness and death. A study published in 2023 in Science focused on sulfur dioxide emissions by coal power plants (coal PM 2.5 ) and concluded that "exposure to coal PM 2.5 was associated with 2.1 times greater mortality risk than exposure to PM 2.5 from all sources." From 1999 to 2020,

1950-463: The WHO halved its recommended guideline limit for tiny particles from burning fossil fuels. The new limit for nitrogen dioxide (NO 2 ) is 75% lower. Growing evidence that air pollution—even when experienced at very low levels—hurts human health, led the WHO to revise its guideline (from 10 μg/m to 5 μg/m ) for what it considers a safe level of exposure of particulate pollution, bringing most of

2015-402: The WHO reported that outdoor air pollution was estimated to cause 4.2 million premature deaths worldwide in 2019. The global mean loss of life expectancy (LLE; similar to YPLL ) from air pollution in 2015 was 2.9 years, substantially more than, for example, 0.3 years from all forms of direct violence. Communities with persons that live beyond 85 years have low ambient air pollution, suggesting

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2080-754: The World Health Organization estimated that every year air pollution causes the premature death of 7 million people worldwide, 1 in 8 deaths worldwide. A study published in 2019 indicated that in 2015 the number may be closer to 8.8 million, with 5.5 million of these premature deaths due to air pollution from anthropogenic sources. A 2022 review concluded that in 2019 air pollution was responsible for approximately 9 million premature deaths. It concluded that since 2015 little real progress against pollution has been made. Causes of deaths include strokes, heart disease, COPD , lung cancer, and lung infections. Children are particularly at risk. In 2021,

2145-778: The World Health Organization, these may be defined as asbestosis, lung cancer, and peritoneal mesothelioma (generally a very rare form of cancer, when more widespread it is almost always associated with prolonged exposure to asbestos). Biological sources of air pollution are also found indoors, as gases and airborne particulates. Pets produce dander, people produce dust from minute skin flakes and decomposed hair, dust mites in bedding, carpeting and furniture produce enzymes and micrometre-sized fecal droppings, inhabitants emit methane, mold forms on walls and generates mycotoxins and spores, air conditioning systems can incubate Legionnaires' disease and mold, and houseplants, soil and surrounding gardens can produce pollen , dust, and mold. Indoors,

2210-571: The World Health Organization. In 2019, 1.6 million deaths in India were caused by air pollution. In 2013, air pollution was estimated to kill 500,000 people in China each year. In 2012, 2.48% of China's total air pollution emissions were caused by exports due to US demand, causing an additional 27,963 deaths across 30 provinces. Annual premature European deaths caused by air pollution are estimated at 430,000 to 800,000. An important cause of these deaths

2275-445: The air when primary pollutants react or interact. Ground level ozone is a prominent example of a secondary pollutant. Some pollutants may be both primary and secondary: they are both emitted directly and formed from other primary pollutants. Pollutants emitted into the atmosphere by human activity include: Secondary pollutants include: There are many other chemicals classed as hazardous air pollutants. Some of these are regulated in

2340-704: The amount of exposure to that pollutant. Air pollution exposure can be measured for a person, a group, such as a neighborhood or a country's children, or an entire population. For example, one would want to determine a geographic area's exposure to a dangerous air pollution, taking into account the various microenvironments and age groups. This can be calculated as an inhalation exposure. This would account for daily exposure in various settings, e.g. different indoor micro-environments and outdoor locations. The exposure needs to include different ages and other demographic groups, especially infants, children, pregnant women, and other sensitive subpopulations. For each specific time that

2405-714: The atmosphere that are harmful to the health of humans and other living beings, or cause damage to the climate or to materials. It is also the contamination of the indoor or outdoor environment either by chemical, physical, or biological agents that alters the natural features of the atmosphere. There are many different types of air pollutants, such as gases (including ammonia , carbon monoxide , sulfur dioxide , nitrous oxides , methane and chlorofluorocarbons ), particulates (both organic and inorganic) and biological molecules . Air pollution can cause diseases, allergies, and even death to humans; it can also cause harm to other living organisms such as animals and crops, and may damage

2470-411: The body's respiratory system and the cardiovascular system . Individual reactions to air pollutants depend on the type of pollutant a person is exposed to, the degree of exposure, and the individual's health status and genetics . Air pollution is the largest environmental risk factor for disease and premature death and the fourth largest risk factor overall for human health. Air pollution causes

2535-451: The chairs of seven MPOs and the chairs of their appointed advisory committee (or their representatives) in order to coordinate transportation planning for the region, that is compatible with all, as well as addressing the challenges of long range planning for a large and growing region that has overlapping issues among the MPOs or transportation plans that extend throughout the entire area. Often

2600-527: The complexity of the process and need to ensure that requirements are properly addressed. There are five core functions of an MPO: If the metropolitan area is designated as an air quality non-attainment or maintenance area, then Presently, most MPOs have no authority to raise revenues such as to levy taxes on their own, rather, they are designed to allow local officials to decide collaboratively how to spend available federal and other governmental transportation funds in their urbanized areas. The funding for

2665-418: The environment, promote energy conservation, improve the quality of life, and promote consistency between transportation improvements and state and local planned growth and economic development patterns. There are a large number of metropolitan planning organizations in the United States. Air quality Air pollution is the contamination of air due to the presence of substances called pollutants in

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2730-663: The extensive use of asbestos in industrial and domestic environments in the past has left a potentially very dangerous material in many localities. Asbestosis is a chronic inflammatory medical condition affecting the tissue of the lungs. It occurs after long-term, heavy exposure to asbestos from asbestos-containing materials in structures. Those with asbestosis have severe dyspnea (shortness of breath) and are at an increased risk regarding several different types of lung cancer . As clear explanations are not always stressed in non-technical literature, care should be taken to distinguish between several forms of relevant diseases. According to

2795-423: The first time, state transportation officials were required to consult seriously with local representatives on MPO governing boards regarding matters of project prioritization and decision-making. These changes had their roots in the need to address increasingly difficult transportation problems—in particular, the more complicated patterns of traffic congestion that arose with the suburban development boom in

2860-470: The form of an aerosol (solid particles or liquid droplets dispersed and carried by a gas). A pollutant can be of natural origin or man-made. Pollutants are classified as primary or secondary. Primary pollutants are usually produced by processes such as ash from a volcanic eruption. Other examples include carbon monoxide gas from motor vehicle exhausts or sulfur dioxide released from factories. Secondary pollutants are not emitted directly. Rather, they form in

2925-520: The health impacts and associated costs of air pollution in the Los Angeles Basin and San Joaquin Valley of Southern California shows that more than 3,800 people die prematurely (approximately 14 years earlier than normal) each year because air pollution levels violate federal standards. The number of annual premature deaths is considerably higher than the fatalities related to auto collisions in

2990-638: The international level, such as the Montreal Protocol , which reduced the release of harmful ozone depleting chemicals, and the 1985 Helsinki Protocol , which reduced sulfur emissions , while others, such as international action on climate change , have been less successful. There are many different sources of air pollution. Some air pollutants (such as nitrogen oxides) originate mainly from human activities, while some (notably radon gas) come mostly from natural sources. However, many air pollutants (including dust and sulfur dioxide) come from

3055-1014: The lack of air circulation allows these airborne pollutants to accumulate more than they would otherwise occur in nature. Air pollution has both acute and chronic effects on human health, affecting a number of different systems and organs but principally affect the body's respiratory system and the cardiovascular system. Afflictions include minor to chronic upper respiratory irritation such as difficulty in breathing, wheezing, coughing, asthma and heart disease , lung cancer , stroke , acute respiratory infections in children and chronic bronchitis in adults, aggravating pre-existing heart and lung disease, or asthmatic attacks. Short and long term exposures have been linked with premature mortality and reduced life expectancy and can result in increased medication use, increased doctor or emergency department visits, more hospital admissions and premature death. Diseases that develop from persistent exposure to air pollution are environmental health diseases, which develop when

3120-418: The means to achieve important national goals including economic progress, cleaner air , energy conservation , and social equity . ISTEA promoted a transportation system in which different modes and facilities—highway, transit, pedestrian , bicycle , aviation , and marine —were integrated to allow a "seamless" movement of both goods and people. New funding programs provided greater flexibility in

3185-558: The members of the executive committee of an MPO act interchangeably as the representative to this seven-MPO regional committee. This committee meets less frequently than the participating MPOs. The enactment of the 1991 Intermodal Surface Transportation Efficiency Act (ISTEA) ushered in a "renaissance" for MPOs. After a decade or more of being consigned to a minimal role in transportation planning, ISTEA directed additional federal funding to MPOs, expanded their authority to select projects, and mandated new metropolitan planning initiatives. For

3250-422: The metropolitan long-range transportation plans, transportation improvement programs , annual planning work programs, budgets, and other policy documents. The policy committee also may play an active role in key decision points or milestones associated with MPO plans and studies, as well as conducting public hearings and meetings. An appointed advisory committee (CAC) develops the recommendations for consideration by

3315-422: The most vulnerable population to death attributable to indoor and outdoor air pollution. Under the Clean Air Act , U.S. EPA sets limits on certain air pollutants, including setting limits on how much can be in the air anywhere in the United States. Mixed exposure to both carbon black and ozone could result in significantly greater health affects. Estimates of deaths toll due to air pollution vary. In 2014

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3380-498: The natural environment (for example, climate change , ozone depletion or habitat degradation ) or built environment (for example, acid rain ). Air pollution can be caused by both human activities and natural phenomena. Air quality is closely related to the Earth's climate and ecosystems globally. Many of the contributors of air pollution are also sources of greenhouse emission i.e., burning of fossil fuel . Air pollution

3445-407: The operations of an MPO comes from a combination of federal transportation funds and required matching funds from state and local governments. In some regions, MPOs have been given authority to handle expanded functions: MPOs differ greatly in various parts of the country and even within states. Some have large staffs, while others may include only a director and a transportation planner. Sometimes

3510-645: The planning process and to see that investment decisions contributed to meeting the air quality standards of the Clean Air Act Amendments . In addition, ISTEA placed a new requirement on MPOs to conduct "fiscally constrained planning", and ensure that long-range transportation plans and short-term transportation improvement programs were fiscally constrained; in other words, adopted plans and programs can not include more projects than reasonably can be expected to be funded through existing or projected sources of revenues. This new requirement represented

3575-538: The policy committee and establishes a ranked proposal for work plans. Most MPOs also establish a technical committee to act as an advisory body to the policy committee for transportation issues that primarily are technical in nature. The technical committee interacts with the MPO's professional staff on technical matters related to planning, analysis tasks, and projects. Through this work, the technical committee develops recommendations on projects and programs for policy committee consideration. Metropolitan travel forecasting

3640-742: The pollutant is how these factors are commonly stated (e.g., kilograms of particulate emitted per tonne of coal burned). These criteria make estimating emissions from diverse sources of pollution easier. Most of the time, these components are just averages of all available data of acceptable quality, and they are thought to be typical of long-term averages. The Stockholm Convention on Persistent Organic Pollutants identified pesticides and other persistent organic pollutants of concern. These include dioxins and furans which are unintentionally created by combustion of organics, like open burning of plastics, and are endocrine disruptors and mutagens . The United States Environmental Protection Agency has published

3705-468: The premature deaths of around 7 million people worldwide each year, or a global mean loss of life expectancy (LLE) of 2.9 years, and there has been no significant change in the number of deaths caused by all forms of pollution since at least 2015. Outdoor air pollution attributable to fossil fuel use alone causes ~3.61 million deaths annually, making it one of the top contributors to human death . Anthropogenic ozone causes around 470,000 premature deaths

3770-566: The previous decades. Many recognized that the problems could only be addressed effectively through a stronger federal commitment to regional planning. The legislation that emerged, the Intermodal Surface Transportation Efficiency Act (ISTEA), was signed into federal law by President George H. W. Bush in December 1991. It focused on improving transportation, not as an end in itself, but as

3835-570: The professional staff of an MPO is provided by a county or a council of governments. In many urban areas, existing organizations such as county governments or councils of government also function as MPOs. The MPO role also may be played by an independent governmental organization or a regional government. In the Portland, Oregon, metropolitan area, for example, Metro is the MPO. In the Minneapolis-St. Paul, Minnesota , metropolitan area,

3900-440: The regulations. Some of the planning topic areas include transportation systems security, emergency preparedness, public participation plans for metropolitan planning, and requiring the electronic publication of plans and TIP/STIP by the MPOs. SAFETEA-LU requires that the statewide transportation planning process and the metropolitan planning process provide for consideration of projects and strategies that will protect and enhance

3965-511: The same area, which average fewer than 2,000 per year. A 2021 study found that outdoor air pollution is associated with substantially increased mortality "even at low pollution levels below the current European and North American standards and WHO guideline values" shortly before the WHO adjusted its guidelines. According to the Global Burden of Disease Study , air pollution is responsible for 19% of all cardiovascular deaths. There

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4030-462: The subgroup is in the setting and engaged in particular activities, the exposure to an air pollutant must integrate the concentrations of the air pollutant with regard to the time spent in each setting and the respective inhalation rates for each subgroup, playing, cooking, reading, working, spending time in traffic, etc. A little child's inhaling rate, for example, will be lower than that of an adult. A young person engaging in strenuous exercise will have

4095-547: The use of funds, particularly regarding using previously restricted highway funds for transit development, improved " intermodal " connections, and emphasized upgrades to existing facilities over building new capacity—particularly roadway capacity. To accomplish more serious metropolitan planning, ISTEA doubled federal funding for MPO operations and required the agencies to evaluate a variety of multimodal solutions to roadway congestion and other transportation problems. MPOs also were required to broaden public participation in

4160-525: The world—97.3 percent of the global population—into the unsafe zone. A lack of ventilation indoors concentrates air pollution where people often spend the majority of their time. Indoor air pollution can pose a significant health risk. According to EPA reports, the concentrations of many air pollutants can be two to five times higher in indoor air than in outdoor air. Indoor air pollutants can be up to 100 times higher in some cases than they are inside. People can spend up to 90% of their time indoors, according to

4225-535: The worst sources. Carbon monoxide poisoning and fatalities are often caused by faulty vents and chimneys, or by the burning of charcoal indoors or in a confined space, such as a tent. Chronic carbon monoxide poisoning can result even from poorly-adjusted pilot lights . Traps are built into all domestic plumbing to keep sewer gas and hydrogen sulfide , out of interiors. Clothing emits tetrachloroethylene , or other dry cleaning fluids, for days after dry cleaning. Though its use has now been banned in many countries,

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