Greta Jimenez
Air pollution is a pressing issue that affects the health and well-being of people worldwide. It is caused by the release of various substances into the atmosphere, including gases, finely divided solids, and liquid aerosols. These pollutants can have detrimental effects on human health, the environment, and even cause economic and aesthetic damage. While there are many different pollutants, the six most common air pollutants, also known as criteria pollutants, are particulate matter, ground-level ozone, carbon monoxide, sulfur dioxide, nitrogen dioxide, and lead. These pollutants are found in urban areas and can come from vehicles, power plants, and other sources of fuel burning. Other common pollutants include TVOC, carbon dioxide, and hazardous air pollutants (HAPs) like benzene and asbestos. Understanding and monitoring air quality is crucial to protect ourselves and the environment from the harmful effects of these invisible pollutants.
| Characteristics | Values |
|---|---|
| Common air pollutants | Carbon monoxide, lead, ground-level ozone, particulate matter, nitrogen dioxide, sulfur dioxide |
| Gaseous criteria air pollutants | Sulfur dioxide, nitrogen dioxide, carbon monoxide, ozone |
| HAPs (hazardous air pollutants) | Benzene, perchloroethylene, methylene chloride, dioxins, asbestos, toluene, cadmium, mercury, chromium, lead compounds |
| Other pollutants | TVOC, carbon dioxide, nitrogen oxides |
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What You'll Learn
Carbon monoxide
To address this issue, the US Environmental Protection Agency (EPA) has implemented standards and data to help state, tribal, and local agencies maintain safe levels of carbon monoxide. These agencies can take necessary measures to ensure that carbon monoxide levels are within acceptable limits. EPA calls pollutants like carbon monoxide "criteria" air pollutants because it regulates them by developing limits based on human health and environmental criteria.
Additionally, individuals can take proactive steps to protect themselves from carbon monoxide exposure. Regularly checking the air quality index (AQI) readings before leaving home can provide valuable information about the air quality in your local area. This awareness can guide your decisions and help you take appropriate precautions when necessary.
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Nitrogen dioxide
While everyone is at risk from the health impacts of nitrogen dioxide pollution, those who live near emission sources are at higher risk. Other vulnerable subpopulations at higher risk from NO2 exposure include people with pre-existing medical conditions such as asthma, chronic obstructive pulmonary disease (COPD), cardiovascular disease, diabetes, and lung cancer, as well as people of color.
The good news is that nitrogen dioxide emissions have been declining due to cleanup efforts and more protective standards. EPA's regional rules to reduce NO2 emissions are helping state and local governments meet National Ambient Air Quality Standards (NAAQS). Monitors show that large urban regions have the highest concentrations of outdoor NO2, and levels are higher on or near heavily traveled roadways.
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Sulfur dioxide
SO2 is formed when fossil fuels containing sulfur, such as coal, petroleum oil, or diesel, are burned. The largest sources of SO2 emissions are power plants, industrial facilities, and other industrial processes such as metal processing and petroleum refining. Diesel vehicles and equipment were once a major source of SO2, but federal regulations to reduce sulfur in diesel fuels have significantly lowered emissions. Ports, smelters, and other sources of sulfur dioxide can also cause high concentrations of emissions nearby, affecting people who live and work in these areas.
In addition to its health impacts, SO2 and other sulfur oxides can contribute to acid rain, which can damage trees, plants, and sensitive ecosystems. They can also react with other compounds in the atmosphere to form fine particles that reduce visibility (haze) and contribute to smog.
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Particulate matter
The health effects of particulate matter are significant. Due to their small size, particles less than 10 micrometers in diameter can penetrate deep into the lungs, and particles smaller than 2.5 micrometers, known as PM2.5, may even enter the bloodstream. These fine particles are the main cause of reduced visibility (haze) in parts of the United States, including national parks and wilderness areas. They can remain suspended in the atmosphere for days to weeks, travelling great distances and affecting air quality far from their original source.
Particle pollution levels tend to be particularly high near busy roads, in urban areas (especially during rush hour), and in industrial zones. While everyone is at risk from the health impacts of outdoor particle pollution, those living near emission sources are at an even higher risk. This includes vulnerable subpopulations such as people of color. High outdoor particle pollution levels can also elevate indoor concentrations, as fine particles can penetrate into homes and buildings.
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Lead
Sources of lead emissions vary from one area to another. On a national level, major sources of lead in the air are ore and metals processing, and piston-engine aircraft operating on leaded aviation fuel. Other sources include waste incinerators, utilities, and lead-acid battery manufacturers. The highest air concentrations of lead are usually found near lead smelters. As a result of regulatory efforts, such as removing lead from motor vehicle gasoline, lead levels in the air decreased by 98% between 1980 and 2014.
Once lead is taken into the body, it is distributed throughout the body via the blood and accumulates in the bones. There is no known safe concentration of lead in the blood, and it can adversely affect multiple organ systems, including the nervous system, kidney function, immune system, reproductive and developmental systems, and the cardiovascular system. Lead exposure during pregnancy can also impact the developing fetus.
Young children are particularly vulnerable to lead poisoning as they may absorb lead at higher rates than adults. Malnourished children are at an increased risk as they absorb more lead when other nutrients are deficient. Lead exposure can have severe and permanent consequences on children's brain development, leading to reduced intelligence, behavioural changes, and decreased educational attainment.
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Frequently asked questions
The six most common air pollutants, also known as "criteria pollutants", are found all over the United States and include carbon monoxide (CO), lead (Pb), ground-level ozone (O3), particulate matter (PM), nitrogen dioxide (NO2), and sulfur dioxide (SO2).
These pollutants are emitted directly into the air from fossil fuels such as fuel oil, gasoline, and natural gas that are burned in power plants, automobiles, and other combustion sources.
Exposure to these pollutants has been associated with adverse health effects such as coughing and wheezing, aggravation of respiratory illnesses like asthma, and neurodevelopmental effects in the case of lead exposure.
It is important to understand the air quality around you and regularly check your local air quality station's Air Quality Index (AQI) readings. Simple solutions like wearing masks or using air purifiers can also help protect against these pollutants.
