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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.
Jul 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.
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.
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.
Oct 31, 2023 · Smog (sometimes referred to as ground-level ozone) occurs when emissions from combusting fossil fuels react with sunlight. Soot—a type of particulate matter—is made up of tiny particles of...
