Normal smog often called London-type smog is mainly a product of burning large amounts of high sulfur coal. Whereas photochemical smog is a more modern phenomena commonly produced by vehicle emissions in contact with sunlight —mostly from burning gasoline and diesel. Visit the page here to learn more about photochemical smog. This page does not include the chemical formulas in the formation of smog—to see them, along with more detail about smog, visit the UC Davis ChemWiki.
Smog forms when pollutants are released into the air. The pollutants are formed both naturally and by humans, however, the human-induced pollutants are of most concern due to the magnitude of pollutants produced by the burning and extraction of fossil fuels , which are known to cause extreme health effects.
The location of smog formation is also of great concern, especially for human health, as a good portion of it is produced within cities where large portions of the population live. One of the primary constituents, ozone, is created through chemical reactions between sunlight and certain pollutants. The other primary constituent, particulate matter, can also form through chemical reactions but is introduced to the atmosphere through other means as well.
Wind may disperse these particles among land, thereby decreasing the amount within a given area. In addition, rainfall may wash these pollutants out of the local atmosphere, [2] however, this can result in other unwanted events like acid rain.
When smog encounters an inversion layer caused by warm areas in the upper atmosphere it can stay over a region for an extended period of time—exposing people to its effects for longer.
Visit the inversion layer page to see how this phenomena occurs. The health effects from smog and its components can be severe, and depend on many variables. Smog is harmful when inhaled, with the severity of it depending on the amount inhaled, the types of pollutants contained in it, as well as the individual's age, weight, activity level, and well-being.
Smog is a mixture of smog and fog that is often found in industrial cities on certain days. The London type of smog smog "Classic" as opposed to photochemical smog as is popular in other major cities is the result of coal smoke particulate matter from incomplete combustion and sulfur dioxide and fog, The resultant heavy acidic mixture of smoke an dfog an create a number of problems related to acidic precipitation and health problems such as asthma.
Mixture of smoke and fog. Yes, photo chemical smog can be a mixture of ozone and other pollutants. Ozone is also a pollutant at ground level. Classic smog is a mixture of coal smoke containing particulate and sufur dioxide and fog. Photochemical smog takes place with the presence of sunlight. London type of smog is caused by air pollution due to combustion of coal.
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