Meghan Hodges
Smog, a combination of smoke and fog, is caused by high levels of hazardous gases like sulphur dioxide, soot, and benzene, which form smoke and react with fog to create chemical compounds. Smog is toxic to humans and can cause severe sickness, shortened life spans, and premature death. It is often worsened by lower temperatures and can cause eye irritation, coughing, difficulty breathing, congestion, and other respiratory problems. While fog is whiter, smog is grey and persists in the air, transferring smoke-like particles that are ingested. Large-scale aerosol pollution can change weather patterns and affect fog formation, with urbanization and industrial pollution contributing to smog development in cities like Mexico City and Los Angeles.
| Characteristics | Values |
|---|---|
| What is it called when fog mixes with pollution? | Smog |
| How is smog formed? | When high levels of hazardous gases like sulphur dioxide, soot, and benzene react with fog to form chemical compounds |
| Where does smog come from? | Smog-causing compounds are often released from factories, crop burning, and other polluting power plants |
| How does smog affect humans? | Smog can cause severe sickness, a shortened lifespan, immature death, eye irritation, coughing, difficulty breathing, congestion, and other respiratory problems |
| How does urbanization affect fog? | Urbanization inhibits low-level fog, delays its formation, and advances its dissipation due to higher temperatures and lower saturations |
| How does air pollution affect fog? | Large-scale aerosol pollution can change weather patterns and affect large-scale fog formation |
| How does fog affect air pollution? | Fog has a removal effect on air pollution, particularly on particulate matter (PM2.5) through wet scavenging |
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What You'll Learn
Smog is a mixture of smoke and fog
Smog is a combination of smoke and fog. The term "smog" was first used in the 1880 publication "Santa Cruz & Monterey Illustrated Handbook" and was later quoted in the "Santa Cruz Weekly Sentinel" in 1880. However, Henry Antoine Des Voeux is often credited with coining the term in his 1905 paper, "Fog and Smoke," for a meeting of the Public Health Congress. The term "smog" was used to describe the mixture of smoke and fog that was prevalent in London at the time.
The formation of smog is influenced by various factors, including urbanization and air pollution. Large-scale aerosol pollution, resulting from rapid urbanization and industrial activities, can alter weather patterns and impact fog formation. In some cases, urbanization may inhibit low-level fog formation due to higher temperatures and lower saturations. However, it can enhance upper-level fog through updraft-induced vapor convergence.
The presence of stable atmospheric conditions, such as an inversion layer, can also contribute to the development of smog by trapping pollution close to the ground. This is often observed in cities located in basins or surrounded by hills, where cold, polluted air sinks and becomes trapped, leading to increased levels of atmospheric pollution.
Smog consists of high levels of hazardous gases, including sulphur dioxide, soot, and benzene. These gases react with the fog to form chemical compounds that make up smog. Smog is known to cause severe health issues, including eye irritation, coughing, difficulty breathing, congestion, and other respiratory problems. It can also worsen with decreasing temperatures, making it a more common occurrence during winter.
While fog and smog may appear similar, there are distinct differences between the two. Fog eventually dissipates, while smog persists in the air, transferring smoke-like particles that can be inhaled. Smog also has a distinct grey tone, in contrast to the whiter appearance of fog.
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Urbanization and air pollution affect fog formation
The mixture of smoke and fog, known as "smog", has been a problem in cities since the Middle Ages, when coal fires were used for heating and energy production. The term "smog" was first recorded in 1880, but it was popularised in 1905 by Dr. Harold Antoine Des Voeux, following a smog episode in Glasgow, Scotland, in 1909.
Urbanization and air pollution have a significant impact on fog formation. Urban areas tend to have higher temperatures and lower saturations due to the urban heat island (UHI) and urban dry island (UDI) effects, which inhibit low-level fog formation and advance its dissipation. In contrast, updraft-induced vapour convergence can enhance upper-level fog. The presence of aerosols in polluted air can also affect fog formation by acting as cloud condensation nuclei (CCN), causing them to activate at lower humidity levels. This can lead to thicker fog in cities with high levels of air pollution.
Aerosols can have both suppressing and promoting effects on fog. They can block solar radiation and lower surface temperature, causing longer fog duration and later dissipation. However, if aerosol concentration exceeds a certain threshold, this promoting effect disappears or even turns into a suppressing effect due to strong vapour competition. Large-scale aerosol pollution can also change weather patterns and affect large-scale fog formation.
Studies have found that in polluted regions of East China, such as Beijing, Tianjin, and Hebei, urbanization and air pollution have had significant impacts on fog events. Urban cores experience minimal fog, while rural outskirts experience maximum fog. The effects of urbanization and air pollution on fog formation are complex and depend on various factors, including land use, atmospheric stratification, temperature, and humidity.
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Fog has a removal effect on air pollution
The mixture of fog and pollution is commonly known as "smog". The term was coined by Henry Antoine Des Voeux in his 1905 paper, "Fog and Smoke", though the term appeared in print 25 years prior in the Santa Cruz & Monterey Illustrated Handbook. Smog is toxic to humans and can cause severe sickness, shortened life spans, and premature death.
While fog and air pollution often coexist, fog has been shown to have a removal effect on air pollution. Fog droplets have been observed to have wet removal effects on almost all species of pollutants. For example, in a dense fog event in North China in 2013, the PM2.5 concentration decreased remarkably from 150 μg m−3 to 45 μg m−3. However, fog cannot completely clean the atmosphere and interrupt a pollution event.
The interaction between fog and air pollution is complex and depends on various factors such as aerosol properties, urban development, and atmospheric conditions. Urbanization, for instance, has been found to inhibit low-level fog formation due to higher temperatures and lower saturations. In contrast, upper-level fog may be enhanced due to updraft-induced vapour convergence.
Large-scale aerosol pollution can also change weather patterns and affect fog formation. Aerosols affect convective clouds through two mechanisms: invigorating convection by promoting vapour condensation, and suppressing convection by blocking solar radiation and reducing surface heat flux. Under heavily polluted conditions, the suppressing effect outweighs the invigorating effect, which can reduce fog occurrence.
Overall, while fog has a removal effect on air pollution, the complex interplay between urbanization, aerosol pollution, and atmospheric conditions influences the formation and dissipation of fog and its ability to mitigate pollution.
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Air pollution affects climate change
The term "smog" was coined by Henry Antoine Des Voeux in his 1905 paper, "Fog and Smoke", to describe the mixture of fog and smoke that was common in great cities. Smog is toxic to humans and can cause severe sickness, shortened life spans, and premature death. It is caused by air pollution, which has a significant impact on the environment and climate change.
Air pollution is a major contributor to climate change, and the two are closely interconnected. Climate change refers to long-term changes in global or regional climate patterns and can be influenced by various factors, including human activities such as burning fossil fuels and deforestation. Air pollution refers to the presence of harmful substances in the air, such as greenhouse gases, particulate matter, and ozone, which can have both local and global effects on the environment and human health.
One of the primary ways that air pollution affects climate change is through the emission of greenhouse gases, such as carbon dioxide (CO2), methane (CH4), and nitrous oxide (N2O). These gases trap heat in the atmosphere, leading to the phenomenon known as the greenhouse effect, which is the primary driver of global warming and climate change. Reducing emissions of these gases is crucial for mitigating climate change and its impacts.
In addition to greenhouse gases, air pollution also includes particulate matter, such as black carbon and aerosols. Black carbon, which is emitted from cookstoves, diesel engines, and the burning of fossil fuels, contributes to the warming of the atmosphere. It absorbs sunlight and converts it into heat, enhancing the greenhouse effect. Aerosols, on the other hand, can have both cooling and warming effects on the climate. They can reflect sunlight back into space, cooling the planet, or they can contribute to cloud formation, which can have complex effects on climate depending on the type and altitude of the clouds.
The complex interplay between air pollution and climate change also leads to feedback loops that further exacerbate the problem. For example, climate change can increase the frequency and intensity of heat waves and droughts, which in turn can degrade air quality. Heat waves enhance ground-level ozone formation and prolong pollen seasons, negatively impacting human health. Drought conditions increase the risk of forest fires, which release carbon monoxide and particulate matter into the atmosphere, further contributing to air pollution and climate change.
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Smog is toxic to humans
Smog is a portmanteau of "smoke" and "fog", and it refers to the harmful mixture of smoke and fog that is toxic to humans. It is a serious problem in many cities and has detrimental effects on human health. Smog is caused by air pollution, which can come from sources such as coal fires, industrial activities, vehicle emissions, and stubble burning in agricultural areas. Large-scale aerosol pollution, a type of air pollution, can change weather patterns and affect large-scale fog formation. Urbanization, for example, can inhibit low-level fog formation due to higher temperatures and lower saturations. However, it can enhance upper-level fog due to updraft-induced vapour convergence.
The presence of smog in the atmosphere can have severe consequences for human health. Ground-level ozone, sulfur dioxide, nitrogen dioxide, and carbon monoxide are especially harmful to senior citizens, children, and individuals with pre-existing heart and lung conditions. Exposure to smog can inflame breathing passages, decrease lung capacity, cause shortness of breath, and lead to eye and nose irritation. It dries out the protective membranes in the nose and throat, making it harder for the body to fight infections and increasing susceptibility to illnesses.
The health risks associated with smog exposure are significant. Studies have shown that smog contributes to thousands of premature deaths each year. Long-term exposure to air pollution increases the likelihood of premature death from respiratory diseases. Additionally, air pollution has been linked to adverse health effects such as asthma. Recent research has also discovered the presence of tiny magnetic particles from air pollution lodged in human brains, which may be a possible factor in the development of Alzheimer's disease.
The impact of smog is not limited to physical health; it also extends to socioeconomic well-being. For example, the Canadian province of Ontario incurs significant economic losses due to the effects of smog, including damage to crops and a decrease in tourism revenue. Smog also affects climate change, influencing weather patterns and contributing to the greenhouse effect.
Overall, smog is a pressing issue that poses a toxic threat to human health, the environment, and socioeconomic stability. It is crucial to address and mitigate the causes of smog to minimize its harmful effects and protect the well-being of individuals and communities affected by this toxic mixture of smoke and fog.
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Frequently asked questions
Fog mixed with pollution is called smog. The word "smog" was coined by Henry Antoine Des Voeux in his 1905 paper, "Fog and Smoke". It is a combination of smoke and fog.
Smog is formed when high levels of hazardous gases like sulphur dioxide, soot, and benzene, which form smoke, react with fog to form chemical compounds. Most of these compounds come from factories, crop burning, and other polluting power plants.
Smog can cause severe sickness, a shortened life span, premature death, eye irritation, coughing, difficulty breathing, congestion, and other respiratory problems.
Unlike fog, smog has tones of grey instead of white. Smog also persists in the air and transfers smoke-like particles that are ingested. Smog can also be smelled, unlike fog.
