[Answer] What is smog?

Answer: Fog or haze intensified by smoke
What is smog?

California Smog Check Program – Wikipedia

Smoke fog or smog for short is a type of intense air pollution. The word “smog” was coined in the early 20th century and is a contraction (portmanteau) of the words smoke and fog to refer to smoky fog due to its opacity and odor. The word was then intended to refer to what was sometimes known as pea soup fog a familiar and serious problem in London from the 19th century to the mid-20th century. T…

Smoke fog or smog for short is a type of intense air pollution. The word “smog” was coined in the early 20th century and is a contraction (portmanteau) of the words smoke and fog to refer to smoky fog due to its opacity and odor. The word was then intended to refer to what was sometimes known as pea soup fog a familiar and serious problem in London from the 19th century to the mid-20th century. This kind of visible air pollution is composed of nitrogen oxides sulphur oxides ozone smoke and other particulates. Man-made smog is derived from coal combustion emissions vehicular emissions industrial emissions forest and agricultural fires and photochemical reactions of these emissions. Smog is often categorized as being either summer smog or winter smog. Summer smog is primarily associated with the photochemical formation of ozone. During the summer season when the temperatures are warmer and there is more sunlight present photochemical smog is the dominant type of smog formation. During the winter months when the temperatures are colder and atmospheric inversions are common there is an increase in coal and other fossil fuel usage to heat homes and buildings. These combustion emissions together with the lack of pollutant dispersion under inversions characterize winter smog formation. While photochemical smog is the main smog formation mechanism during summer months winter smog episodes are still common. Smog formation in general relies on both primary and secondary pollutants. Primary pollutants are emitted directly from a source such as emissions of sulfur dioxide from coal combustion. Secondary pollutants such as ozone are formed when primary pollutants undergo chemical reactions in the atmosphere. Photochemical smog as found for example in Los Angeles is a type of air pollution derived from vehicular emission from internal combustion engines and industrial fumes. These pollutants react in the atmosphere with sunlight to form secondary pollutants that also combine with the primary emission… Read more on Wikipedia

Coinage of the term “smog” is often attributed to Dr. Henry Antoine Des Voeux in his 1905 paper “Fog and Smoke” for a meeting of the Public Health Congress. The 26 July 1905 edition of the London newspaper Daily Graphic quoted Des Voeux “He said it required no science …

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