Kiera Jefferson
Nitrogen dioxide (NO2) is a gaseous air pollutant composed of nitrogen and oxygen. It is a member of a family of chemicals known as nitrogen oxides or NOx, which also includes nitric acid and nitrous acid. NO2 is formed when fossil fuels such as coal, oil, gas, or diesel are burned at high temperatures. It is emitted from vehicles, power plants, and off-road equipment. NO2 contributes to the reddish-brown haze characteristic of smoggy air and has negative health impacts, including lung and heart harm, and adverse pregnancy and birth outcomes.
| Characteristics | Values |
|---|---|
| Chemical composition | One atom of nitrogen and two atoms of oxygen |
| State | Gas at ambient temperatures |
| Colour | Brownish-red |
| Smell | Pungent |
| Health impact | Irritates airways in the human respiratory system, aggravates respiratory diseases, causes coughing, wheezing, and difficulty breathing |
| Vulnerable subpopulations | People with pre-existing medical conditions such as asthma, chronic obstructive pulmonary disease (COPD), cardiovascular disease, diabetes, lung cancer, people of colour, children, and the elderly |
| Sources | Burning of fossil fuels such as coal, oil, gas, or diesel at high temperatures, vehicle emissions, power plants, industrial sites, on-road vehicles, and off-road equipment |
| Control measures | EPA's national and regional rules to reduce NO2 and NOx emissions, state, local, and tribal government plans to reduce NO2, cleanup of emission sources |
| Ambient air quality standards | Maximum pollutant concentration in outdoor air without harming human health: 0.18 ppm for a one-hour standard and 0.030 ppm for an annual average standard |
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What You'll Learn
Nitrogen dioxide is a gaseous pollutant
Nitrogen dioxide (NO2) is a gaseous pollutant and a member of the nitrogen oxides (NOx) family of chemicals, which also includes nitric acid and nitrous acid. NO2 is composed of one nitrogen atom and two oxygen atoms and is a gas at ambient temperatures. It has a pungent odour and a brownish-red colour.
Nitrogen dioxide is formed when fossil fuels such as coal, oil, gas, or diesel are burned at high temperatures. The primary sources of NO2 emissions are trucks, buses, and cars, followed by industrial processes such as oil and gas production, and coal-fired power plants. NO2 is also formed through photochemical reactions between nitric oxide (NO) and other air pollutants in the presence of sunlight.
Nitrogen dioxide is a significant air pollutant that poses risks to human health and the environment. Even short-term exposure to high concentrations of NO2 can irritate the airways and aggravate respiratory diseases, especially asthma. Prolonged exposure to elevated levels of NO2 may contribute to the development of asthma and increase susceptibility to respiratory infections. Additionally, NO2 has been linked to adverse effects on pregnancy and birth outcomes, as well as an increased risk of heart and lung issues, kidney problems, and neurological harm.
To address the harmful effects of nitrogen dioxide, regulatory bodies like the US EPA and state governments have implemented standards and regulations to reduce NO2 emissions and improve air quality. These efforts include setting maximum allowable concentrations of NO2 in outdoor air and working with state and local governments to meet National Ambient Air Quality Standards (NAAQS). As a result of these measures, nitrogen dioxide levels in the United States have decreased over the years, leading to improved air quality nationwide.
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It is formed by burning fossil fuels
Nitrogen dioxide (NO2) is a gaseous air pollutant composed of nitrogen and oxygen. It is a member of a family of chemicals known as nitrogen oxides or NOx, which also includes nitric acid and nitrous acid. NO2 is formed when fossil fuels such as coal, oil, gas, or diesel are burned at high temperatures. This process typically occurs in power plants, industrial sites, and vehicles, with trucks, buses, and cars being the largest sources of NO2 emissions.
NO2 emissions are highly correlated with those of other oxides of nitrogen and several other traffic-related pollutants. As a result, measures that reduce NO2 emissions will also decrease the release of other harmful NOx species. NO2 is a critical component of photochemical smog, contributing to the reddish-brown haze often observed in smoggy air.
The burning of fossil fuels releases NO2 into the atmosphere, where it can react with other chemicals to form additional pollutants. These secondary pollutants include ozone (O3), particulate matter, acid rain, and other toxic chemicals. High concentrations of NO2 and these secondary pollutants can cause a range of adverse health effects, particularly for those living near emission sources.
Short-term exposure to elevated levels of NO2 can irritate the airways and aggravate respiratory conditions such as asthma, leading to coughing, wheezing, and breathing difficulties. Longer-term exposure may contribute to the development of asthma and potentially increase susceptibility to respiratory infections. Studies have also linked elevated NO2 levels to heart and lung harm, adverse pregnancy and birth outcomes, and a potentially higher risk of kidney and neurological harm, autoimmune disorders, and cancer.
Regulators have implemented standards and measures to reduce NO2 emissions and improve air quality. For example, the US Clean Air Act has helped drive down nitrogen dioxide emissions, leading to improved outdoor air quality nationwide. Additionally, the Environmental Protection (Air) Amendment Policy 2024 (EPP Air) has set objectives for nitrogen dioxide exposure to protect sensitive individuals, including children and asthmatics.
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NO2 is harmful to human health
Nitrogen dioxide (NO2) is a reddish-brown gas with a pungent odour. It is a major air pollutant, emitted mainly by combustion engines. NO2 is a member of a family of chemicals known as nitrogen oxides (NOx). NO2 is harmful to human health in several ways. Firstly, it irritates the airways in the human respiratory system. Short-term exposure to high concentrations of NO2 can aggravate respiratory diseases, especially asthma, leading to coughing, wheezing, and difficulty breathing. Prolonged exposure to elevated levels of NO2 may also contribute to the development of asthma and increase susceptibility to respiratory infections and chronic lung disease. People with asthma, children, and the elderly are at greater risk of experiencing the health effects of NO2.
Secondly, NO2 has adverse effects on cardiovascular health. A recent study published in BMJ found a linear association between short-term exposure to NO2 and an increased risk of cardiovascular and respiratory-related deaths.
Thirdly, a 2022 review of multiple studies linked elevated NO2 levels to heart and lung harm, adverse pregnancy and birth outcomes, and a likely increased risk of kidney and neurological harm, autoimmune disorders, and cancer.
Furthermore, NO2 contributes to the formation of smog and haze, reducing visibility. This is caused by the formation of nitrate aerosols (particulate matter) that, along with NO2, can penetrate deep into the respiratory tract due to the very small size of the particles.
While everyone is at risk from the health impacts of NO2, certain subpopulations are at higher risk, including those living near emission sources, such as major roads, and people with pre-existing medical conditions like asthma, chronic obstructive pulmonary disease (COPD), cardiovascular disease, diabetes, and lung cancer.
To protect human health, the World Health Organization (WHO) has set an annual average NO2 concentration limit of 10 µg/m3. Ambient air quality standards have also been established to define the maximum allowable pollutant levels in outdoor air. Regulations and standards, such as the US EPA's National Ambient Air Quality Standards (NAAQS), aim to reduce NO2 emissions and improve air quality.
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It contributes to smog
Nitrogen dioxide (NO2) is a gaseous air pollutant composed of nitrogen and oxygen. It is a member of a family of chemicals known as nitrogen oxides (NOx), which also includes nitric acid and nitrous acid. NO2 is formed when fossil fuels such as coal, oil, gas, or diesel are burned at high temperatures. As such, NO2 emissions primarily come from cars, trucks, buses, power plants, and off-road equipment.
NO2 is a significant contributor to smog. It is one of the six common air pollutants known as criteria pollutants, which are subject to primary and secondary National Ambient Air Quality Standards under the Federal Clean Air Act. In the presence of sunlight, NO2 reacts with other chemicals in the air to form other pollutants, such as ozone (O3), particulate matter, acid rain, and other toxic chemicals that can cause lung irritation and respiratory issues. These toxic chemicals produce the reddish-brown haze characteristic of smoggy air in places like California.
The health impacts of NO2 pollution affect everyone, but those living near emission sources, such as major roads or industrial sites, are at a higher risk of adverse health effects. People with pre-existing medical conditions, such as asthma, chronic obstructive pulmonary disease (COPD), cardiovascular disease, diabetes, and lung cancer, are particularly vulnerable to the harmful effects of NO2. Additionally, vulnerable subpopulations, including people of colour, children, and the elderly, are more susceptible to the negative consequences of NO2 exposure.
The good news is that air quality has improved in recent years due to regulatory efforts and the transition to cleaner power plants, industrial sites, and vehicles. For example, the US Environmental Protection Agency (EPA) has implemented rules to reduce NO2 emissions, helping state and local governments meet the National Ambient Air Quality Standard (NAAQS). Similarly, the Clean Air Act has driven down nitrogen dioxide emissions, leading to improved air quality nationwide.
Despite this progress, many people still breathe unhealthy levels of NO2 pollution. To address this issue, the EPA identifies areas that do not meet the national NO2 standards and works with state, local, and tribal governments to develop plans to reduce NO2 levels in those regions. Additionally, the California Air Resources Board has lowered the state one-hour standard for NO2 to 0.18 ppm and retained the annual average standard of 0.030 ppm to protect sensitive individuals, including children and asthmatics. These regulatory efforts are crucial in mitigating the health risks associated with NO2 pollution and reducing its contribution to smog formation.
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There are rules and standards in place to reduce NO2 emissions
Nitrogen Dioxide (NO2) is a gaseous air pollutant composed of nitrogen and oxygen. NO2 is formed when fossil fuels such as coal, oil, gas, or diesel are burned at high temperatures. It is a pungent gas that contributes to the reddish-brown haze characteristic of smoggy air in places like California. NO2 is harmful to human health, particularly the respiratory system, and can cause coughing, wheezing, and difficulty breathing. It is especially dangerous for people with pre-existing medical conditions such as asthma, cardiovascular disease, and diabetes.
In 2007, California's Air Resources Board lowered the state one-hour standard for NO2 to 0.18 ppm while retaining the annual average standard of 0.030 ppm based on evidence of adverse health effects. The national standard was revised in 2010 following a review of literature that pointed to adverse effects on asthmatics at lower NO2 concentrations. The Clean Air Act requires the EPA to periodically review and update the NAAQS to ensure adequate health and environmental protection.
Additionally, the federal Clean Air Act has helped drive down nitrogen dioxide emissions nationwide. Power plants, industrial sites, and on-road vehicles are now cleaner, leading to improved air quality across the country. However, there are still many people who breathe in unhealthy levels of NO2 pollution, especially in large urban regions.
To further reduce NO2 emissions, cleanup efforts must continue for trucks, buses, cars, diesel-powered non-road equipment, industrial processes, boilers, and coal-fired power plants, as these are the largest sources of NO2 emissions. By addressing these sources and implementing the NAAQS, NO2 emissions can be reduced, improving air quality and protecting public health.
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Frequently asked questions
Nitrogen dioxide (NO2) is a pungent gas composed of nitrogen and oxygen. It is one of a group of highly reactive gases known as nitrogen oxides or NOx.
Nitrogen dioxide is formed when fossil fuels such as coal, oil, gas, or diesel are burned at high temperatures. It is produced from natural sources, motor vehicles, and other fuel-burning processes.
Nitrogen dioxide is a pollutant that can cause harm to both human health and the environment. Exposure to high levels of nitrogen dioxide can irritate the airways and cause coughing, wheezing, or difficulty breathing. It can also contribute to the formation of other pollutants, such as ozone, particulate matter, and acid rain.
