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May 13, 2024 · Smog is polluted air that lies over many cities and has various sources and effects. Learn about sulfurous smog, photochemical smog, and atmospheric brown clouds from Britannica's editors.
- The Editors of Encyclopaedia Britannica
Smog, or smoke fog, is a type of intense air pollution. The word "smog" was coined in the early 20th century, and is a portmanteau of the words smoke and fog to refer to smoky fog due to its opacity, and odor.
Oct 19, 2023 · Smog is a mix of smoke and fog that reduces visibility and harms human health and the environment. Learn about the causes, effects, and solutions of smog, and see examples of smoggy cities and events.
Aug 24, 2021 · Smog is a mixture of air pollutants that form ozone near the ground and affect human health and the environment. Learn how smog is produced, where it occurs, and how to recognize it.
- Larry West
Learn how ozone and particulate matter, the main components of smog, are formed by chemical reactions involving VOCs and nitrogen oxides in the presence of sunlight. Find out how smog affects human health, the environment, and what we can do to reduce it.
Aug 13, 2019 · Smog can spike during hot days. A new study finds that the effects of breathing air pollution may be cumulative. Long-term exposure may lead to lung disease, even among people who've never smoked.
Apr 25, 2024 · Learn how the transportation sector contributes to smog, soot, and other air pollution, and what EPA programs and standards are in place to reduce them. Find out the health and environmental benefits of cleaner fuels, vehicles, and engines.
