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Smog is a type of air pollution that reduces visibility and is harmful to human health. It is a combination of harmful pollutants, often appearing as a yellow-brown haze, that are introduced into the atmosphere by both natural and human-induced processes. The term smog was coined in the early 20th century, derived from the words smoke and fog. The main components of smog are ground-level ozone and particulate matter, which can cause respiratory problems and other negative health impacts. Other types of pollution found in smog include carbon monoxide, nitrogen dioxide, and sulfur dioxide. These pollutants are released into the air through the combustion of fossil fuels, industrial emissions, and vehicle exhaust, among other sources.
| Characteristics | Values |
|---|---|
| Composition | Nitrogen oxides, sulfur oxide, ozone, smoke, and other particulates |
| Origin | Coal combustion emissions, vehicular emissions, industrial emissions, forest and agricultural fires, and photochemical reactions of these emissions |
| Types | Summer smog, winter smog, sulfurous smog, and photochemical smog |
| Health Effects | Respiratory distress, eye irritation, plant damage, cardiovascular issues, cerebrovascular issues (stroke), lung cancer, Alzheimer's disease |
| Pollutants | Particulate matter (PM), carbon monoxide (CO), ozone (O3), nitrogen dioxide (NO2), sulfur dioxide (SO2), volatile organic compounds (VOCs) |
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What You'll Learn
Nitrogen oxides, hydrocarbon vapours, and volatile organic compounds (VOCs)
Nitrogen oxides are one of the many components of smog, which is a type of air pollution that forms when primary pollutants, such as emissions from coal combustion, react with sunlight to create secondary pollutants. This process is more common in warmer, sunnier weather, and the smog can linger over densely populated cities and urban areas, causing dangerous levels of air pollution.
Hydrocarbon vapours are another contributor to air pollution. Hydrocarbons are organic compounds composed of hydrogen and carbon, and they are a primary energy source in modern society. They are found in many household and occupational products, including motor fuels, paint thinners, cleaning agents, and industrial solvents. Inhalation, ingestion, or dermal exposure to hydrocarbon vapours can lead to serious toxicity and even death. The pulmonary system is most commonly affected, but the cardiovascular, nervous, and gastrointestinal systems can also be impacted.
Volatile organic compounds (VOCs) are emitted as gases from certain solids or liquids, and they can have adverse short- and long-term health effects. Indoor levels of VOCs can be significantly higher than outdoor levels due to the use of products containing organic chemicals, such as paint, glues, and cleaning agents. Formaldehyde, a well-known VOC, can be readily measured and is considered an indoor air pollutant. Exposure to VOCs can cause various symptoms and has been linked to cancer in both animals and humans.
It is important to note that the specific effects of these pollutants on human health depend on factors such as the level of exposure and the length of time exposed. While nitrogen oxides and VOCs are more commonly associated with outdoor air pollution, hydrocarbon vapours can be a concern in both indoor and outdoor settings, especially when inhaled or ingested. Overall, these pollutants contribute to the overall degradation of air quality and pose risks to human health.
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Sulphur dioxide and other fossil fuels
Sulphur dioxide is a major pollutant that contributes to smog, a type of air pollution. Smog is a portmanteau of the words "smoke" and "fog", referring to smoky fog due to its opacity and odour. Sulphur dioxide is released from the combustion of fossil fuels, particularly coal, and is a primary pollutant, directly emitted from a source. It is one of the main components of "sulphurous smog" or "London smog", which has a high concentration of sulphur oxides due to the use of sulphur-bearing fossil fuels.
Other fossil fuels also contribute to air pollution, especially during the winter months when there is an increase in the use of coal and other fossil fuels for heating. The combustion emissions from these fuels, combined with the lack of pollutant dispersion under inversions, characterise winter smog formation.
In addition to sulphur dioxide, the combustion of fossil fuels releases other pollutants such as nitrogen oxides, carbon monoxide, volatile organic compounds (VOCs), and particulate matter. Nitrogen oxides are a family of gases that contribute to pollution and are harmful to human health. They are released from sources such as truck and automobile emissions, electric power plants, and industrial sources. Carbon monoxide is a deadly pollutant that affects health by reducing the blood's ability to carry oxygen, starving vital tissues. VOCs are carbon-containing compounds that easily evaporate at room temperature and enter the air. They are emitted from human-made sources such as paints, pesticides, solvents, fuel production, combustion, and older-model cars.
Particulate matter, or PM, is made up of solid and liquid particles that vary in size and composition. The smaller particles, known as "respirable PM", can penetrate deep into the lungs and cause damage to the cardio-respiratory system, resulting in infections, asthma, bronchitis, and emphysema. The combustion of fossil fuels, particularly in power generation facilities, industries, and vehicles, is a significant source of PM.
The pollutants released from the combustion of fossil fuels contribute to the formation of smog, which has adverse effects on human health and the environment. Sulphur dioxide, in particular, is a major component of sulphurous smog, and its release from the combustion of fossil fuels, such as coal, makes it a significant contributor to air pollution.
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Particulate matter
The sources of particulate matter can be both indoor and outdoor. In the home, the greatest source is generally the combustion of polluting fuels in open hearths or poorly vented stoves and space heaters. Household activities like cooking, space heating, and lighting also contribute. Outdoor sources are typically location-specific and can include traffic, industrial activities, power plants, construction sites, waste burning, and fires.
Additionally, particulate matter can have adverse effects on plant life. Ground-level ozone, a component of smog, can damage plant cells, inhibit their growth, and reduce their ability to perform photosynthesis effectively. This leads to decreased agricultural yields and impacts synthetic materials, causing deterioration or disintegration over time.
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Ground-level ozone
Ozone pollution is closely monitored in many places, such as Washington State, where it is currently within the healthy range. However, certain areas, like the Tri-Cities region near Kennewick, have recently shown periods of relatively high ozone levels. To address this issue, the Washington State Department of Ecology recommends reducing emissions by driving less, using cleaner fuels, and limiting the use of gasoline-powered equipment and paint products during hot weather.
The EPA in the United States also plays a crucial role in regulating ground-level ozone pollution. They designate areas as attainment or nonattainment based on whether they meet national ambient air quality standards. States with nonattainment areas must develop state implementation plans (SIPs) to outline measures for improving air quality. These regulations aim to protect human health and the environment from the detrimental effects of ground-level ozone.
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Carbon monoxide
The presence of carbon monoxide in the air can have detrimental effects on human health. It is particularly dangerous because it binds with haemoglobin in the blood, reducing its ability to carry oxygen. This process starves vital tissues and organs of oxygen, which can lead to serious health issues, especially for individuals with weaker immune systems or pre-existing health conditions. High levels of carbon monoxide can cause headaches, dizziness, confusion, nausea, fainting, and even death in severe cases. Prolonged exposure to lower levels of carbon monoxide can also have adverse effects on overall health and well-being.
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Frequently asked questions
Smog is a specific type of air pollution. It is a combination of harmful pollutants that are introduced into the atmosphere by both natural and human-induced processes.
Smog is made up of many chemicals, including nitrogen oxides (NOx), sulphur dioxide (SOx), carbon monoxide (CO), and volatile organic compounds (VOCs). The two main components of smog are particulate matter (PM) and ground-level ozone (O3).
Particulate matter (PM) refers to inhalable particles composed of sulphate, nitrates, ammonia, sodium chloride, black carbon, mineral dust, or water. PM can vary in size and is generally defined by its aerodynamic diameter, with PM2.5 and PM10 being the most common in regulatory frameworks and relevant for health.
Ozone is a greenhouse gas made of three atoms of oxygen. While stratospheric ozone forms a protective layer in the upper atmosphere that shields us from the sun's ultraviolet radiation, ground-level ozone is a pollutant and a primary ingredient of smog. It is an intense irritant that can damage the eyes, nose, throat, and lungs, causing respiratory problems.
The health risks associated with smog are well documented. Exposure to smog can cause respiratory distress, coughing, shortness of breath, irritation of the eyes, and aggravate asthma. Long-term exposure to particulate matter has been linked to lung cancer, cardiovascular diseases, and adverse perinatal outcomes. Additionally, tiny magnetic particles from air pollution have been found lodged in human brains, potentially contributing to neurodegenerative diseases like Alzheimer's.
