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May 13, 2024 · Smog, community-wide polluted air. Although the term is derived from the words smoke and fog, it is often used to describe the pall of automotive or industrial origin that lies over many cities, and its composition is variable.
- 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 air pollution that reduces visibility. The term "smog" was first used in the early 1900s to describe a mix of smoke and fog. The smoke usually came from burning coal. Smog was common in industrial areas, and remains a familiar sight in some cities today. Today, most of the smog we see is photochemical smog.
Aug 24, 2021 · Smog is a mixture of air pollutants— nitrogen oxides and volatile organic compounds —that combine with sunlight to form ozone. Ozone can be beneficial or harmful depending on its location.
- Larry West
Apr 25, 2024 · EPA implements national programs and standards for fuels and vehicles that reduce air pollution including smog, soot, and toxic pollutants, and spur investments in clean vehicle and engine technology.
Smog is mainly made of ground-level ozone and particulate matter. Here, Caltech scientists explain the smog formation process.
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.
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