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Nitrogen dioxide (NO2) is a reddish-brown gas and air pollutant that is soluble in water and acts as a strong oxidant. It is produced as both a primary and secondary pollutant by combustion processes. Sources of NO2 include vehicle emissions, industrial processes, and household sources such as gas stoves and ovens. High temperatures and incomplete combustion of fuels contribute to the formation of NO2. This gas poses health risks, particularly for individuals with respiratory conditions such as asthma, and can lead to adverse effects on breathing and respiratory illness symptoms. Additionally, NO2 plays a role in the formation of ground-level ozone, a secondary pollutant, through reactions with volatile organic compounds.
| Characteristics | Values |
|---|---|
| Definition | Pollutants that are formed in the lower atmosphere by chemical reactions |
| Examples | Ozone, secondary organic aerosol (haze), peroxyacyl nitrates (PANs), nitric acid, sulfates, nitrates, carbon monoxide |
| Formation | When primary pollutants react with molecules in the atmosphere |
| Primary pollutants involved | Hydrocarbons, nitrogen oxides, volatile organic compounds |
| Sources of primary pollutants | Combustion activities (motor vehicles, power plants, wood burning), certain industrial processes |
| Health effects | Reduced respiratory function, eye irritation, emphysema, impaired breathing, other lung problems, asphyxia, shortness of breath, coughing, irritation to eyes, nose and throat |
| Environmental effects | Contributes to acid rain, reduces visibility |
| Sensitivity | Sensitive to weather patterns |
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What You'll Learn
- Nitrogen dioxide (NO2) is a reddish-brown gas, soluble in water, and a strong oxidant
- Ground-level ozone is a secondary pollutant formed by the action of sunlight on primary pollutants
- Sulfur dioxide is emitted by industrial furnaces or power plants burning coal or oil containing sulfur
- Carbon monoxide (CO) is a poisonous gas that combines with hemoglobin in the blood, inhibiting oxygen delivery to body tissue
- Smog is composed of particulate matter such as pollen, dust, sulfur oxides, and ammonia gas
Nitrogen dioxide (NO2) is a reddish-brown gas, soluble in water, and a strong oxidant
Nitrogen dioxide, or NO2, is a reddish-brown gas that is soluble in water and a strong oxidant. It is one of several nitrogen oxides and has a bent molecule with C2v point group symmetry. NO2 is a good oxidizer, and will combust in the presence of hydrocarbons. This gas is a pollutant that is harmful to human health, and is known to cause respiratory issues and diseases.
Nitrogen dioxide is formed through the oxidation of nitric oxide by oxygen in the air, often as a result of corona discharge. It is introduced into the Earth's atmosphere through natural processes, including entry from the stratosphere, bacterial respiration, volcanic activity, and lightning. NO2 is also a byproduct of human activity, such as the combustion of fuels in transportation, industry, and power generation. The use of gas stoves for cooking is a significant source of indoor nitrogen dioxide, which can lead to poorer air quality within homes.
In its gaseous form, nitrogen dioxide is reddish-brown and heavier than air, with a pungent odour that can be perceived from a concentration of 188 μg/m3 (0.1 ppm). It is corrosive and poorly soluble in water. When nitrogen dioxide reacts with water, it forms nitrous acid and nitric acid. This reaction is an important step in the industrial production of nitric acid from ammonia, which is used primarily for the production of fertilizers.
Nitrogen dioxide is a significant contributor to air pollution, particularly in dense urban areas where concentrations can exceed 500 μg/m3. It plays a role in absorbing sunlight and regulating the chemistry of the troposphere, influencing ozone concentrations in the atmosphere. The health effects of NO2 exposure are caused by the reaction products, which can lead to bronchoconstriction, inflammation, and a reduced immune response.
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Ground-level ozone is a secondary pollutant formed by the action of sunlight on primary pollutants
Ground-level ozone, also known as surface-level or tropospheric ozone, is a harmful secondary pollutant. It is formed when two primary pollutants, nitrogen oxides (NOx) and volatile organic compounds (VOCs), react in the presence of sunlight. This process is sensitive to weather patterns, particularly the amount of sunlight, which is why pollution levels tend to be higher in the summer months.
Nitrogen oxides are produced by the combustion of fossil fuels, such as the burning of coal, gasoline, and oil. About 95% of NOx from human activity comes from motor vehicles, homes, industries, and power plants. VOCs, on the other hand, have both human and natural sources. Human activities that produce VOCs include gasoline combustion and marketing, upstream oil and gas production, residential wood combustion, and the evaporation of liquid fuels and solvents. Natural sources of VOCs include coniferous forests.
Ground-level ozone is a major component of smog and has significant impacts on both human health and the environment. Exposure to ozone has been linked to premature mortality, hospital admissions, and adverse health effects, especially for those with underlying respiratory conditions such as asthma, chronic obstructive pulmonary disease (COPD), and lung cancer. The irritation of the respiratory system can cause coughing, throat irritation, and an uncomfortable sensation in the chest.
Ozone can also affect vegetation, decreasing the productivity of some crops and injuring flowers and shrubs. It may even contribute to forest decline in certain regions. Furthermore, ozone can damage synthetic materials, cause cracks in rubber, accelerate the fading of dyes, and speed up the deterioration of paints and coatings.
To address the harmful effects of ground-level ozone, organizations like the EPA in the United States have implemented rules to reduce emissions of pollutants that form this secondary pollutant. These include vehicle and transportation standards, regional haze and visibility rules, and regular reviews of air quality standards.
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Sulfur dioxide is emitted by industrial furnaces or power plants burning coal or oil containing sulfur
Sulfur dioxide (SO2) is a colorless gas with a pungent smell, often described as the odor of burnt matches. It is a toxic gas and a common air pollutant. SO2 is emitted by industrial furnaces or power plants burning fossil fuels or oil that contains sulfur.
The burning of fossil fuels, particularly those containing sulfur, is a major source of SO2 emissions. Power plants, industrial facilities, and other human activities contribute significantly to the release of SO2 into the atmosphere. This process involves the combustion of sulfur-bearing fossil fuels, which results in the production of SO2 as a byproduct.
Additionally, sulfur dioxide can be released through the refining of metals and the burning of sulfur-containing materials. Volcanic activity also contributes to natural emissions of SO2.
Once emitted into the atmosphere, SO2 can create secondary pollutants such as sulfate aerosols, particulate matter, and acid rain. These secondary pollutants have significant environmental and health impacts. For example, acid rain can damage trees, plants, and sensitive ecosystems, while particulate matter can contribute to respiratory illnesses and aggravate existing heart and lung conditions.
To address the issue of SO2 pollution, regulatory bodies such as the US EPA have implemented national ambient air quality standards. These standards aim to reduce SO2 emissions and protect human health and the environment from the adverse effects of this toxic gas.
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Carbon monoxide (CO) is a poisonous gas that combines with hemoglobin in the blood, inhibiting oxygen delivery to body tissue
Carbon monoxide (CO) is a colourless, odourless, and poisonous gas that is harmful to human health. It is a byproduct of the incomplete burning of fuels, with industrial processes and vehicle emissions being the primary sources of carbon monoxide pollution. CO has a strong affinity for hemoglobin, the molecule in red blood cells that carries oxygen throughout the body. Specifically, CO has an affinity for hemoglobin that is 210 times that of oxygen. When CO enters the bloodstream, it combines with hemoglobin, forming carboxyhemoglobin and preventing oxygen from being transported to the body's tissues. This can lead to asphyxia or shortness of breath and poses a serious health threat, especially to individuals with cardiovascular disease. Even healthy individuals can be affected at high exposure levels.
The health effects of carbon monoxide are primarily due to its interference with oxygen delivery in the body. Oxygen is essential for cellular respiration, the process by which cells generate energy. By inhibiting oxygen transport, carbon monoxide disrupts normal cellular function and can lead to tissue damage. Prolonged exposure to carbon monoxide can have severe consequences, including brain damage and death.
Carbon monoxide is a significant concern in indoor environments, particularly those with poor ventilation. Inadequate ventilation can lead to a buildup of CO, increasing the risk of exposure. Sources of carbon monoxide in indoor spaces can include gas stoves, furnaces, and heaters, especially when they are not properly maintained or vented. Using charcoal or gas grills indoors or in enclosed spaces can also lead to dangerous levels of carbon monoxide.
Additionally, carbon monoxide exposure can be a concern in workplaces, especially in industrial settings where fuels are burned or certain chemical processes are used. Workers in industries such as welding, mining, and smelting may be at higher risk of exposure. Occupational safety guidelines emphasize the importance of proper ventilation and monitoring of CO levels in these environments to protect workers' health.
While carbon monoxide itself is not a component of smog, it can contribute to the formation of ground-level ozone, which is a secondary pollutant and a major constituent of smog. Ground-level ozone is formed through photochemical reactions involving nitrogen oxides and volatile organic compounds in the presence of sunlight. High concentrations of ground-level ozone are associated with adverse health effects and environmental damage.
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Smog is composed of particulate matter such as pollen, dust, sulfur oxides, and ammonia gas
Smog is a type of air pollution that is caused by the emission of pollutants from various sources, such as vehicles, industrial activities, and power generation facilities. It is a significant issue in cities with warm and sunny climates, where it can cause severe health problems for residents.
The composition of smog includes particulate matter, which is made up of tiny solid particles and liquid droplets that are small enough to be inhaled. These particles can include pollen, dust, and other substances. For instance, larger particles, also known as coarse particles, are primarily composed of pollen, sea spray, and wind-blown dust from sources like erosion, agriculture, roadways, and mining operations. On the other hand, smaller particles, known as PM2.5, can be formed through the combustion of fuels in power generation or industrial processes, as well as through secondary sources such as chemical reactions between gases.
In addition to particulate matter, smog contains gases such as nitrogen oxides, sulfur dioxide, and ozone. Nitrogen oxides are a family of gases released from vehicles, power plants, and industrial sources, contributing significantly to air pollution and posing health risks. Sulfur dioxide (SO2) is another gas present in smog, emitted directly from sources like coal combustion. Furthermore, when SO2 and nitrogen oxides (NOx) are released into the atmosphere, they undergo oxidation to form nitric acid, a key component of acid rain.
Ozone (O3), a secondary pollutant, plays a crucial role in the formation of smog. Ground-level ozone acts as a primary ingredient in smog and is considered harmful. It is formed through the combination of hydrocarbons and nitrogen oxides in the presence of sunlight. This process is characteristic of photochemical smog, which is prevalent in cities with warm and sunny conditions.
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Frequently asked questions
Secondary pollutants are those formed by a combination or reaction with primary pollutants. Primary pollutants are emitted directly into the air from a source.
Ground-level ozone is a secondary pollutant formed by the action of sunlight on primary pollutants. Nitrogen oxides, volatile organic compounds, and sulphur oxides are also secondary pollutants.
Primary pollutants are emitted directly into the air from a source. Examples include particulate matter, oxides of nitrogen, and toxic metals.
Secondary pollutants like ground-level ozone and nitrogen oxides can have serious and harmful effects on human health and the environment. Nitrogen dioxide, for instance, is an irritant gas that causes narrowing of the airways in both asthmatic and non-asthmatic individuals.
