Air pollution is the introduction of chemicals, particulate matter, or biological materials into the atmosphere that can harm living organisms or damage the natural and built environment. The industrialization of society, introduction of motor vehicles, and population explosion are contributing to growing air pollution problems. Major pollutants found in urban areas include carbon monoxide, nitrogen oxides, sulfur oxides, hydrocarbons, and particulate matter. Air pollution can cause smog and damage trees, and increase ultraviolet radiation exposure which can lead to health issues like skin cancer and cataracts. Solutions include restricting population growth, using less energy, improving energy efficiency, and reducing waste.

7. SMOG The products of photochemical reactions includes organic particles, ozone, aldehydes, ketones, peroxyacetyl nitrate, organic acids, and other oxidants

12. ^Do not wait for the right moment to take care of your environment. Do it now. If you wait for the right time, never stop waiting and the world is destroyed gradually^.