Bronte Wells
Air pollutants are substances that contaminate the air and can cause serious health issues and adverse environmental effects. They can be classified into two main types: primary and secondary. Primary pollutants are emitted directly into the atmosphere, such as carbon monoxide from vehicle exhausts, while secondary pollutants are formed through chemical reactions between primary pollutants, like the formation of photochemical smog from interactions between nitrogen oxides and volatile organic compounds (VOCs). The US EPA categorizes certain pollutants as criteria pollutants, which are regulated based on their impact on human health and the environment. These include ground-level ozone, particle pollution, carbon monoxide, lead, nitrogen oxides, and sulfur oxides. Other hazardous air pollutants, or HAPs, are known or suspected to cause cancer and other severe health issues. Examples of HAPs include benzene, perchloroethylene, asbestos, mercury, and lead compounds. To fully understand air pollution dynamics and implement effective preventative measures, it is crucial to measure a wide range of pollutants and consider their interactions.
| Characteristics | Values |
|---|---|
| Hazardous air pollutants (HAPs) | Benzene, perchloroethylene, methylene chloride, dioxins, asbestos, toluene, cadmium, mercury, chromium, lead compounds |
| Common or criteria pollutants | Ground-level ozone, particle pollution, carbon monoxide, lead, nitrogen oxides, sulfur oxides |
| Particulate matter (PM) | PM2.5, PM10 |
| Sources of PM | Pollen, sea spray, wind-blown dust from erosion, agricultural spaces, roadways, mining operations, combustion of fuels, chemical reactions between gases |
| Other pollutants | VOCs, NOx, peroxyacetyl nitrate (PAN), formaldehyde, nitrogen dioxide, tetrachloroethylene |
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Particulate matter
PM2.5, or fine particles, have diameters of 2.5 micrometers or less. These particles are more dangerous because they can get into the deep parts of the lungs and even into the bloodstream. They are the main cause of reduced visibility (haze) in many parts of the United States, including national parks and wilderness areas. Ultrafine particles have diameters of 100 nm or less.
The health effects of particulate matter have been widely studied, and exposure has been linked to a range of adverse outcomes. Inhalation of particulate matter can cause respiratory issues, cardiovascular problems, tissue damage, developmental disorders, neurodegenerative disorders, mental disorders, and premature death. It is estimated to cause tens of thousands of deaths per year in the United States and hundreds of thousands of premature deaths globally.
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Carbon monoxide
Cars, trucks, and other vehicles or machinery that burn fossil fuels are the greatest sources of outdoor CO. A variety of household items, such as unvented kerosene and gas space heaters, leaking chimneys and furnaces, and gas stoves, also release CO and can impact indoor air quality. CO can cause harmful health effects by reducing oxygen delivery to the body's organs and tissues. Even healthy people can be affected by high levels of CO, which can cause dizziness, confusion, unconsciousness, and even death.
CO is regulated as a "criteria" air pollutant by the EPA, which sets and reviews standards for CO in outdoor air under the Clean Air Act. EPA standards and data help state, tribal, and local agencies ensure that CO is maintained at a safe level.
In addition to its direct health impacts, CO also contributes indirectly to climate change. It participates in chemical reactions in the atmosphere that produce ozone, a potent climate change gas. Due to its role in climate change and air pollution, CO emission reductions are considered a potential strategy to mitigate the effects of global warming.
CO levels can be considerably higher indoors than outdoors, with gas stoves, malfunctioning or improperly vented gas appliances, space heaters, fireplaces, tobacco smoke, and car emissions all contributing to indoor CO levels. It is important to ensure proper ventilation and maintenance of gas appliances to mitigate the risks associated with indoor CO exposure.
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Ozone
Long-term exposure to ozone is associated with increased respiratory illnesses, metabolic disorders, nervous system issues, reproductive issues, and increased respiratory and cardiovascular-related mortality. Breathing in other pollutants such as sulfur dioxide and nitrogen oxide can make the lungs react more strongly to ozone, and ozone may also increase the response to allergens in people with allergies.
To protect public health, the EPA regulates ground-level ozone as one of six "criteria" air pollutants, meaning that its levels in outdoor air must be limited based on health criteria. States must draft plans to improve the air quality in areas that do not meet the national standard, and the EPA has rules in place to reduce emissions of pollutants that form ground-level ozone.
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Nitrogen dioxide
NO2 primarily gets into the air from the burning of fuel. It is formed from emissions from cars, trucks, buses, power plants, and off-road equipment. The highest concentrations of outdoor NO2 are found in large urban regions, and levels are higher on or near heavily travelled roadways. This is because road traffic is the principal outdoor source of nitrogen dioxide.
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Hazardous air pollutants
HAPs are regulated by the EPA under the Clean Air Act, which requires the reduction of HAPs emissions from industrial facilities in two phases. The EPA works with state, local, and tribal governments to achieve this. HAPs data and emissions controls are used to develop regulatory programs that limit emissions from stationary sources.
Major sources of HAPs include emissions from coal-fired power plants, industries, refineries, and vehicles such as cars, trucks, and buses. Certain industries produce specific toxins, such as ethylene oxide from medical equipment sterilization facilities. Chemical releases from accidents at industrial facilities or during hazardous material transport can also release HAPs into the air.
Indoor air can also contain HAPs from tobacco smoke, building materials like asbestos, and consumer products like cleaning supplies and air fresheners. HAPs can settle into soil and waterways, leading to potential ingestion or consumption through drinking water or fish.
While particle pollution is not always classified as a hazardous air pollutant, it can still cause serious health issues, including cancer. It is made up of tiny solid or liquid particles in the air, which can be large enough to be visible, like smoke, or so small that they are invisible. Smaller particles, known as PM2.5, can penetrate deep into the lungs and even enter the bloodstream, posing a more significant health risk.
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Frequently asked questions
There are various types of air pollutants, including particulate matter, carbon monoxide, ozone, nitrogen dioxide, and sulfur dioxide. These pollutants can be released into the air through household activities, industrial processes, and vehicle emissions.
Particulate matter, also known as particle pollution, refers to tiny solid or liquid particles in the air. These particles can be of different sizes, with larger particles (PM10) irritating the eyes, nose, and throat, and smaller particles (PM2.5) reaching the deep parts of the lungs or even the bloodstream.
Common sources of air pollutants include vehicle emissions, industrial activities, power generation facilities, and household activities such as cooking, heating, and lighting with kerosene. Outdoor air pollution can also be caused by natural sources such as wind-blown dust, pollen, and sea spray.
