Kiera Jefferson
Nitrogen dioxide (NO2) is a gaseous air pollutant and a member of the nitrogen oxides (NOx) family. NO2 is primarily released into the air through the burning of fossil fuels such as coal, oil, methane gas, and diesel at high temperatures. Cars, trucks, and buses are the largest sources of NO2 emissions, followed by non-road diesel-powered equipment, industrial processes, and coal-fired power plants. NO2 is also produced from burning natural gas (methane) and wood, both outdoors and indoors. High levels of NO2 are typically found near heavily travelled roadways and large urban regions. NO2 contributes to particle pollution and the formation of other air pollutants, including ozone (O3) and nitric acid (HNO3). Exposure to NO2 irritates the airways and can cause adverse health effects, particularly for individuals with pre-existing respiratory conditions such as asthma.
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What You'll Learn
Burning fossil fuels
Nitrogen dioxide (NO2) is a gaseous air pollutant composed of nitrogen and oxygen. It is one of a group of related gases called nitrogen oxides or NOx. NO2 is primarily released into the air through the burning of fuel, including the burning of fossil fuels, such as coal, oil, methane gas (natural gas), or diesel at high temperatures.
The burning of fossil fuels has been steadily increasing since the invention of the first coal-fired steam engines in the 1700s. Today, fossil fuels are burned to generate energy for electricity, transportation, and industrial processes. This combustion releases NO2 into the atmosphere, contributing to air pollution and negatively impacting human health and the environment.
Trucks, buses, and cars are the largest sources of NO2 emissions from burning fossil fuels. These vehicles burn fossil fuels like diesel and gasoline, releasing NO2 into the air through their emissions. Additionally, non-road equipment, such as construction vehicles, and industrial processes, including oil and gas production and industrial boilers, also contribute significantly to NO2 emissions.
Power plants, particularly coal-fired power plants, are another significant source of NO2 pollution from burning fossil fuels. These plants burn coal, oil, or natural gas to generate electricity, emitting NO2 into the atmosphere. Gas-fired power plants, for example, contribute to NO2 emissions both outdoors and indoors.
The burning of fossil fuels, such as natural gas, wood, or other fuels, indoors can also lead to elevated levels of NO2. Gas stoves, space heaters, and other appliances that burn natural gas or liquified petroleum gas (LPG) can produce substantial amounts of NO2. If these appliances are not adequately vented, NO2 levels can build up indoors, posing health risks to occupants.
NO2 pollution from burning fossil fuels has harmful effects on human health, particularly the respiratory system. Short-term exposure to high concentrations of NO2 can irritate airways and aggravate respiratory diseases, especially asthma. Prolonged exposure may contribute to the development of asthma and increase susceptibility to respiratory infections. Vulnerable populations, including children, the elderly, and individuals with pre-existing medical conditions, are at higher risk of experiencing adverse health effects from NO2 pollution.
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Industrial processes
Nitrogen dioxide (NO2) is a chemical compound and a highly reactive reddish-brown gas. It is one of a group of gases known as oxides of nitrogen or nitrogen oxides (NOx). It is formed by various combinations of oxygen and nitrogen at high temperatures during the combustion process.
The use of gas appliances, such as gas stoves for cooking, and gas heaters, also produces NO2, leading to poorer indoor air quality. In industrial settings, higher concentrations of gaseous NO2 can cause eye irritation.
The EPA has implemented rules to reduce NO2 emissions, and these efforts have led to improvements in air quality. However, strong economic activity in developing regions corresponds to increasing NO2 emissions.
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Vehicle emissions
Diesel engines, in particular, have been associated with high proportions of NO2/NOx emissions. This is due to the use of emission control technologies such as Diesel Oxidation Catalysts. However, recent data from the UK shows that while new diesel cars and light commercial vehicles have high NO2/NOx emissions, the overall absolute emissions of NOx and NO2 from Euro 6 vehicles have decreased substantially. This trend of decreasing NO2 emissions with increasing vehicle mileage has also been observed in light-duty diesel vehicles, contributing to reduced NO2 concentrations near roadsides.
To mitigate NOx emissions, modern diesel vehicles often employ exhaust-gas recirculation (EGR) systems. EGR reduces the oxygen content and increases the water vapour content of the combustion mixture, thereby lowering the peak combustion temperature and the amount of NOx produced. However, a delicate balance must be maintained as excessive exhaust gas recycling can increase PM2.5 and reduce fuel efficiency.
NOx emissions from vehicles have detrimental effects on human health and the environment. Exposure to secondary fine particulate matter (PM2.5) formed from NOx and atmospheric chemicals can lead to serious health issues, including stroke, ischemic heart disease, and respiratory infections. Additionally, NOx contributes to the formation of ground-level ozone, a significant component of smog, which can exacerbate chronic lung diseases.
Furthermore, vehicle emissions of nitrous oxide (N2O) have a global warming impact, contributing to the growth rate of this greenhouse gas in the atmosphere. Laboratory and remote sensing measurements have provided consistent data on N2O emissions from various vehicles, aiding in the understanding of their environmental impact.
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Power plants
Nitrogen dioxide (NO2) is a gaseous air pollutant composed of nitrogen and oxygen. It is a member of the NOx family, which includes nitric oxide (NO), nitrous oxide, nitrous acid, and nitric acid. NO2 is formed when fossil fuels such as coal, oil, methane gas (natural gas), or diesel are burned at high temperatures. This process is known as fuel combustion, and it occurs in power plants, vehicles, and industrial facilities. Therefore, power plants are a significant source of NO2 emissions.
Thermal power plants, which generate electricity through the combustion of fuel, are a dominant source of NO2 emissions. This is because the burning of fossil fuels, such as coal and oil, releases a significant amount of NOx gases. Additionally, gas-fired power plants that use natural gas (methane) as a fuel source also contribute to NO2 emissions.
NO2 emissions from power plants have been addressed through the implementation of regulations and standards. For example, the Clean Air Act in the United States has helped drive down nitrogen dioxide emissions from power plants, leading to improved air quality nationwide. Federal and state regulations have also played a role in reducing NOx emissions from power plants, resulting in significant decreases in NO2 levels.
However, it is important to note that power plants are not the only source of NO2 pollution. Other sources include vehicles, industrial facilities, and even indoor sources such as unvented heaters and gas stoves. Nonetheless, power plants play a significant role in the production of NO2, and efforts to reduce emissions from these sources have positively impacted air quality.
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Indoor sources
Nitrogen dioxide (NO2) is a gaseous air pollutant composed of nitrogen and oxygen. It is formed when fossil fuels such as coal, oil, methane gas (natural gas), or diesel are burned at high temperatures. NO2 can also form indoors when fuels like wood or gas are burned.
Indoor levels of NO2 are influenced by the presence of NO2-emitting appliances, the indoor-outdoor air exchange rate (whether windows are open or closed), and seasonal factors. Gas stoves, space heaters, and gas ovens are common indoor sources of NO2 emissions. Other potential sources include improperly vented furnaces, water heaters, and clothes dryers.
The use of gas appliances is more frequent during winter, leading to higher NO2 levels compared to summer when ventilation through open windows is also reduced. Unvented gas stoves can cause average nitrogen dioxide concentrations to exceed 150 μg/m3 over several days. However, a Canadian study found no significant association between wood-burning appliances and elevated NO2 levels.
Tobacco smoke and the burning of kerosene, oil, or coal in appliances are also identified as significant indoor sources of NO2.
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Frequently asked questions
NO2, or nitrogen dioxide, is a gaseous air pollutant that is formed when fossil fuels such as coal, oil, methane gas, or diesel are burned at high temperatures.
Cars, trucks, and buses are some of the largest sources of NO2 emissions, followed by non-road vehicles and equipment, industrial processes, and power plants.
NO2 is a harmful air pollutant that irritates the airways and contributes to respiratory problems, especially in individuals with asthma. It also reacts with other chemicals to form particulate matter and ozone, further reducing air quality.
Cleaner power plants, industrial sites, and vehicles have helped reduce NO2 emissions. Additionally, individuals can advocate for policy changes to promote the cleanup of air pollution and protect themselves on days with high levels of air pollutants.
