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It may seem obvious, but road traffic is the main source of air pollution. It is also exacerbated by weather conditions and locality.
Air pollution consists of many chemicals which are the by-products of engine combustion. Some are present as gases, while others are solid, suspended in the air as particles. The contributing substances may appear in the air in different amounts, in various combinations and often interact with each other. There is no constant in pollution which only serves to increase the risk and make it harder for scientists to evaluate its effects.
