How does urbanization cause air pollution?

Urbanization has resulted in concentration of industries around the cities. Big and small industries, power plants, brick kilns create air pollution. Also there are numerous vehicles in the urban areas creating a lot of air pollution. Urbanization causes air pollution in following ways:

1. The burning of fuels in automobiles and aeroplanes lead to emission of Carbon Monoxide and Hydrocarbons containing nitrogen and oxygen.
2. Industries like il refinery discharge Ammonia, Hydrocarbons and Sulphur oxide. Aluminium plants release fluoride dust.
3. Burning of garbage lead to emission of carbon dioxide and nitrogen oxide.
4. Brick kilns also release huge quantity of Carbon dioxide and particulate matters.
5. Use of cleansing agents release chemicals like Ammonia and chlorine, causing indoor pollution.
6. Use of radioactive elements or use of isotopes(medical purpose) lead to emission of α, β and γ radiations.