Describe, in terms of the production of photochemical smog, what is meant by primary pollutants, and secondary pollutants in the atmosphere, and list the main primary and secondary pollutants produced as a result of motor vehicles.

... Describe, in terms of the production of photochemical smog, what is meant by primary pollutants, and secondary pollutants in the atmosphere, and list the main primary and secondary pollutants produced as a result of motor vehicles. (3) * 3 Paragraphs - One about photochemical smog, leading to PP, and SP. - One about PP and SP - List about the PP's and SP's produced by cars Photochemical smog is a combination of many chemical substances called primary and secondary pollutants. This smog is not very visible, but it's very oxidizing. It forms during high pressure conditions in the lowest part of the atmosphere, the troposphere. There is usually still air which doesn't mix with altitude air, trapping the pollutants. [1] Primary pollutants are pollutants that have been directly released into the atmosphere, for example in the combustion of fuels. When primary pollutants undergo further reactions, secondary pollutants are formed. [1] Primary pollutants: Nitrogen Oxides (NOx), Volatile Organic

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