The main causes of air pollution are the traffic, industries and agriculture. During all these processes, air pollutants are emitted. Large concentrations of substances like Volatile Organic Compounds negatively affects public health and ecosystem.
Traffic is held responsible for air pollution most of the times. Emissions caused by traffic are mainly includes carbon dioxide, carbon monoxide, nitrogen oxides, VOC and small dust particles.
Industrial processes are responsible for the emission of chemical wastes in large quantities. Industrial processes leads to the emission of carbon dioxide, carbon monoxide, nitrogen oxides, sulphur dioxide, VOC and methane.
Nitrous oxide is mainly caused from agriculture processes as denitrification process includes emission of mitrous oxide. Also, the application of fertilizers causes emission of ammonia, nitrogen oxide and methane. The extensive use of pesticides also causes the emission of many toxic chemicals.
Lastly, the indoor air pollution caused by the people or consumers. This leads to dual pollution as the products have caused air pollution in its manufacturing cycle, and later they cause air pollution in its distribution and application.