Helena Joyce
Nitrogen oxides are a group of related gases that contribute to air pollution. Nitrogen dioxide (NO2) is one of the most common nitrogen oxides and is considered a primary pollutant. It is formed during the combustion of fossil fuels such as coal, oil, methane gas, and diesel, as well as from the use of unvented gas stoves and tobacco smoke. NO2 contributes to particle pollution and the formation of smog, acid rain, and tropospheric ozone. N2O5, or dinitrogen pentoxide, is another nitrogen oxide that is formed through the reaction of nitric acid (HNO3) with water vapour or liquid water, forming nitric acid. While N2O5 reacts rapidly with water, its role as an indoor or outdoor pollutant is less clear.
| Characteristics | Values |
|---|---|
| N2O5 formation | Via heterogeneous reaction, N2O5 forms from the reaction of water vapour or liquid water with HNO3 |
| N2O5 reaction | N2O5 reacts rapidly with liquid water to form nitric acid (HNO3) |
| N2O5 and NOx removal | Nitric acid can be removed through wet and dry deposition, resulting in the removal of NOx from the atmosphere |
| NOx formation | NOx is formed during the combustion of fuels, such as hydrocarbons, in the presence of nitrogen and oxygen at high temperatures |
| NOx sources | Road traffic, industrial activities, transportation, and natural sources like lightning |
| NOx pollution | NOx contributes to smog formation, acid rain, ozone depletion, and tropospheric ozone changes |
| Health impacts | Adverse effects on lung tissue, reduction in lung function, increased risk of lung diseases, and potential DNA mutations |
| Vulnerable populations | Children, the elderly, people with asthma or other pre-existing medical conditions, and people of colour |
| Nitrogen dioxide (NO2) sources | Fossil fuel combustion, indoor fuel burning, and unvented gas stoves |
| Nitrogen dioxide (NO2) health effects | Respiratory issues, increased likelihood of hospital admissions, potential asthma development in children |
| Nitrous oxide (N2O) pollution | Nitrous oxide is a greenhouse gas that contributes to global warming and ozone depletion |
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What You'll Learn
- N2O5 is formed through the reaction of nitric acid and water vapour or liquid water
- N2O5 is not a primary pollutant, unlike nitrogen dioxide (NO2)
- NO2 is a reddish-brown gas with a pungent odour and is a common air pollutant
- NO2 is formed during the combustion of fossil fuels like coal, oil, methane gas, and diesel
- NO2 is linked to respiratory issues and diseases, and can be fatal if inhaled in large quantities
N2O5 is formed through the reaction of nitric acid and water vapour or liquid water
Nitrogen oxides are known to contribute to air pollution. Nitrogen dioxide (NO2), in particular, is a principal nitrogen oxide associated with combustion sources. It is a reddish-brown gas with a pungent, acrid odour above 21.2 °C (70.2 °F; 294.3 K) and becomes a yellowish-brown liquid below 21.2 °C. It is poisonous and can be fatal if inhaled in large quantities. Cooking with a gas stove, for example, produces nitrogen dioxide, which causes poorer indoor air quality.
Nitrogen dioxide is also a precursor for smog formation, which is an issue in places like California. It is produced and transported as its cryogenic liquid dimer, dinitrogen tetroxide (N2O4). Industrially, it is produced by the oxidation of ammonia, known as the Ostwald Process, which is the first step in the production of nitric acid.
Dinitrogen pentoxide (N2O5) is formed through the reaction of nitric acid and water vapour or liquid water. This reaction has been well-documented in chemistry literature. When dinitrogen pentoxide gas dissolves in water, it reacts to form two molecules of nitric acid (HNO3). This reaction can be written as N2O5(g) + H2O(l) → 2HNO3(aq). The reactants N2O5 and H2O are in gaseous and liquid states, respectively, while the product HNO3 is in an aqueous state. This reaction exemplifies Nitrogen(V) oxide, N2O5, being the anhydride of nitric acid.
N2O5 reacts rapidly with liquid water and water vapour to form nitric acid (HNO3). Nitric acid can be removed through wet and dry deposition, resulting in the removal of NOx from the atmosphere. NOx, in turn, contributes to the formation of smog and acid rain, which harms sensitive ecosystems such as lakes and forests.
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N2O5 is not a primary pollutant, unlike nitrogen dioxide (NO2)
Nitrogen dioxide (NO2) is a poisonous gas that can be fatal if inhaled in large quantities. It is a significant air pollutant, particularly in urban areas with high traffic density. NO2 is one of the nitrogen oxides (NOx) that contribute to smog, acid rain, and the depletion of the ozone layer. The combustion of fossil fuels, such as coal, oil, methane, and diesel, at high temperatures, is a primary source of NO2 emissions.
N2O5, on the other hand, is not considered a primary pollutant. It is a product of the reaction between NO2 and water vapour or liquid water, forming nitric acid (HNO3). While N2O5 itself is not a major concern in terms of direct pollution, the formation of nitric acid can have environmental implications. Nitric acid can be removed from the atmosphere through wet and dry deposition, contributing to the removal of NOx.
The presence of NO2 in the atmosphere is a more pressing issue, with health organisations such as the World Health Organization (WHO) and the American Lung Association providing guidelines and highlighting the risks associated with nitrogen dioxide pollution. High concentrations of NO2 can lead to respiratory issues and diseases, and it is particularly harmful to vulnerable populations, including children, the elderly, and people with pre-existing medical conditions such as asthma, COPD, cardiovascular disease, and diabetes.
The sources of NO2 pollution are diverse, including road traffic, industrial activities, and the combustion of fossil fuels. Efforts to reduce NO2 emissions have been implemented, such as the US EPA's rules to reduce NO2 and NOx emissions and the federal Clean Air Act, which has helped improve air quality. However, N2O5 is not a primary focus in terms of pollution, as it is a secondary product of reactions involving NO2 and water.
While N2O5 itself may not be a primary pollutant, it is important to recognise that it is connected to the broader discussion of air quality and pollution. The formation of N2O5 through reactions involving NO2 highlights the complex chemical processes occurring in the atmosphere. Therefore, while N2O5 may not be a primary pollutant, understanding its role in atmospheric chemistry can contribute to a more comprehensive approach to addressing air pollution and its impacts on human health and the environment.
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NO2 is a reddish-brown gas with a pungent odour and is a common air pollutant
Nitrogen dioxide (NO2) is a reddish-brown gas with a pungent odour. It is a member of a family of chemicals known as nitrogen oxides, which are formed by the reaction between nitrogen and oxygen during the combustion of fuels. NO2 is a common air pollutant, contributing to the reddish-brown haze that characterises smoggy air. It is primarily produced by road traffic, as well as indoor sources such as tobacco smoke, gas stoves, and burning appliances.
NO2 is a significant contributor to air pollution, particularly in dense urban areas. It plays a role in the formation of smog, acid rain, and tropospheric ozone. High concentrations of NO2, often found in large cities, can have adverse effects on human health. Controlled human exposure studies have shown that NO2 exposure can intensify responses to allergens in allergic asthmatics and lead to respiratory issues. Infants and children are especially vulnerable due to their higher breathing rate relative to their body weight and greater outdoor exposure.
Additionally, NO2 reacts with volatile organic compounds (VOCs) in the presence of sunlight to form ozone. While ozone in the upper atmosphere protects life on Earth by absorbing ultraviolet radiation, ground-level ozone is a harmful pollutant. It can cause damage to lung tissue and reduce lung function, primarily affecting children, the elderly, and people with asthma. Furthermore, NO2 contributes to the formation of other air pollutants, including nitric acid (HNO3) and nitrate (NO3-) particles.
To address NO2 pollution, regulatory bodies such as the US EPA and the California Air Resources Board have implemented measures to reduce emissions. These include setting air quality standards and working with state, local, and tribal governments to develop plans for improving air quality. Efforts to reduce NO2 emissions also positively impact the reduction of other nitrogen oxide species, as control measures targeting NO2 will have a beneficial effect on decreasing emissions of other NOx compounds.
While N2O5 was not specifically discussed in the context of air pollution in the sources provided, it is mentioned as a product formed from the reaction of NO2 with ozone. N2O5 reacts rapidly with water vapour or liquid water to form nitric acid (HNO3), which can be removed from the atmosphere through deposition processes, contributing to the removal of NOx compounds.
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NO2 is formed during the combustion of fossil fuels like coal, oil, methane gas, and diesel
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 formed during the combustion of fossil fuels like coal, oil, methane gas (natural gas), and diesel at high temperatures. NO2 and other nitrogen oxides in the outdoor air contribute to particle pollution and the chemical reactions that make ozone.
NO2 is a primary pollutant that is usually considered the product of the oxidation of nitric oxide (NO) in the air. NO is emitted during the combustion of fossil fuels, and it is rapidly oxidized in the air to form NO2. The higher the combustion temperature, the more nitric oxide is generated. Indeed, 90–95% of nitrogen oxides are emitted as nitric oxide, and only 5–10% are emitted as nitrogen dioxide.
The combustion of fossil fuels like oil, coal, and gas releases large amounts of NO2 and carbon dioxide (CO2) into the atmosphere. These combustion processes, such as heating systems, power generation, and engines, also release other pollutants like carbon monoxide (CO), sulfur dioxide (SO2), nitric oxide (NO), volatile organic compounds (VOCs), and hydrocarbons (HCs).
Outdoor sources of NO2 include gas-fired power plants and facilities that extract, process, or transport oil and gas. The primary sources of NOx emissions are motor vehicles, trucks, buses, cars, and diesel-powered non-road equipment. High levels of NO2 are found in large urban regions with heavy traffic congestion, such as the Northeast corridor, Chicago, and Los Angeles.
Indoor sources of NO2 include the burning of fuels like wood or gas, tobacco smoke, and gas-, wood-, oil-, kerosene-, and coal-burning appliances such as stoves, ovens, heaters, and fireplaces, especially if they are unflued or poorly maintained. High NO2 concentrations are also associated with the use of candles, incense, and mosquito coils.
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NO2 is linked to respiratory issues and diseases, and can be fatal if inhaled in large quantities
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, or diesel are burned at high temperatures. NO2 is one of the six widespread air pollutants with national air quality standards limiting their levels outdoors.
NO2 is harmful when inhaled and can irritate the airways in the human respiratory system. Exposure to high levels of NO2 over short periods can aggravate respiratory diseases, especially asthma, leading to coughing, wheezing, and breathing difficulties. Prolonged exposure to elevated NO2 concentrations may also contribute to the development of asthma and increase susceptibility to respiratory infections. People with pre-existing respiratory conditions such as asthma, chronic obstructive pulmonary disease (COPD), and other medical conditions are at a higher risk of adverse health effects from NO2 inhalation. Scientific evidence suggests that NO2 exposure may cause asthma in children.
NO2 inhalation can result in both short-term and long-term respiratory issues, including morbidity or death, depending on the extent and duration of exposure. Nitrogen dioxide poisoning occurs when NO2 is inhaled beyond the threshold limit. It causes inflammation of the mucous membrane and the upper and lower respiratory tracts. The toxicity of NO2 on the respiratory tract depends on the dose inhaled, with higher concentrations leading to more severe effects.
Indoor sources of NO2 include appliances that burn natural gas, liquefied petroleum gas, kerosene, and other fuels. Inadequate ventilation of these appliances can lead to a buildup of NO2 to unhealthy levels indoors. Outdoor sources of NO2 include vehicles such as trucks, buses, and cars, as well as industrial processes and power plants that burn fossil fuels.
Overall, NO2 is a significant respiratory hazard, and prolonged or high-level exposure can have severe consequences for human health, including fatal outcomes in severe cases.
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Frequently asked questions
N2O5 is dinitrogen pentoxide, which is formed through the reaction of nitric acid.
N2O5 is not a primary pollutant. However, it reacts rapidly with water vapour or liquid water to form nitric acid, which can be removed through wet and dry deposition, resulting in the removal of NOx from the atmosphere.
NOx refers to nitrogen oxides, which are a group of gases that contribute to air pollution. These include nitric oxide (NO) and nitrogen dioxide (NO2), which are associated with combustion sources.
NOx is produced through the combustion of fossil fuels such as coal, oil, methane gas, and diesel at high temperatures. It is also naturally produced by lightning and through the use of nitrogen fertilisers in agriculture.
