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In the production of photochemical smog, there are primary and secondary sources that contribute to its production.
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In the production of photochemical smog, there are primary and secondary sources that contribute to its production. Primary sources are injected directly into the atmosphere, whereas secondary sources are formed in the atmosphere through chemical and photochemical reactions. As the graph shows, motor vehicles (the red and pink columns) contribute largely to most of the primary pollutants. The main pollutants though are Carbon Monoxide and oxides of nitrogen (Nox). Motor vehicles also contribute largely to the secondary pollutant Nitrogen Dioxide. During the combustion of coal, primary pollutants are formed. Oxides of Nitrogen and Sulphur are formed because is there is both nitrogen and sulphur in coal - initially from the decomposed organisms. This becomes oxidised by burning. Oxides of Nitrogen are also created because there is such a high temperature of combustion, atmospheric nitrogen and oxygen form what is called thermal NOx (1). Photochemical smog is a condition that develops when...
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