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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.
Learn about the sources, impacts and history of smog in Canada. Smog is a mixture of gases and particles that affects health and the environment, especially in summer and winter.
May 13, 2024 · smog, community-wide polluted air. Its composition is variable. The term is derived from the words smoke and fog, but it is commonly used to describe the pall of automotive or industrial origin that lies over many cities.
- The Editors of Encyclopaedia Britannica
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.
Jun 5, 2023 · Smoke from wildfires in Ontario and Quebec has made Ottawa's air quality the worst among Canada's major cities. Environment Canada warns that the air quality may remain dangerous for days and advises people to reduce outdoor activities and exposure.
Learn about the sources, effects and costs of outdoor air pollution in Canada, including smog, ozone, particulate matter and wildfire smoke. Find out how to minimize the health impacts and contact us for more information.
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.
