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While Sydney has occasional pollution problems, the city fares much better than places such as Beijing.
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"Fine particle pollution is a serious health problem, predicted to get worse in many urban areas and is not effectively managed by state governments," said Dr Ben Ewald, of Doctors for the Environment Australia.
They are widely used as disinfectants. Other sources are jet plane emissions which contain chlorofluorocarbons. Chlorofluorocarbons are also used in refrigeration and formation of certain types of solid plastic foams. Burning of plastics produces polychlorinated biphenyls (PCBs). The latter are persistent and pass into the food chain. Chlorofluorocarbons and carbon tetrachloride react with ozone layers of stratosphere and hence deplete the same.