Some main sources of pollution are burning of fossil fuel (Petroleum, wood, dung, oil stoves etc) which emits pollutants such as carbon monoxide and nitrogen oxides. Carbon emission is linked with the process of incomplete burning of fossil fuel.
Other contributors are agricultural activities, industrial activities, mining operations and all emissions coming from domestic and indoor sources.
Pollution in cities is measured in terms of Suspended Particulate Matter in the air commonly known as SPM.
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