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Smog refers to a noxious mixture of gases and particles that often appears as a haze in the air. It has been linked to a number of adverse effects on health and the environment. The two primary pollutants in smog are ground-level ozone ( O 3 ) and particulate matter ( PM ).
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.
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.
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.
Sulphur dioxide is a colourless gas that smells like burnt matches. It is one of the main ingredients in acid rain. Sulphur dioxide, combines with volatile organic chemicals (VOCs) and sunlight, creates ground-level ozone, the main ingredient in smog.
The Info-Smog program offers air quality forecasts and smog warnings in Quebec.
VOCs exposed to sunlight react photochemically with NOx, producing ozone and organic aerosols, two key components of smog. VOCs include a range of chemicals that can be found in natural emissions (biogenic emissions), combustion products (e.g. engine exhaust) and evaporative emissions from consumer products (e.g. oil-based paint, cleaning ...
