A carcinogen is any substance, radionuclide, or radiation that promotes carcinogenesis, the formation of cancer. This may be due to the ability to damage the genome or to the disruption of cellular metabolic processes.

Des Voeux coined the term smog in 1905 to describe the condition of fog which has smoke in it. C. J.F.

Ozone absorbs ultraviolet radiation but lets other types of radiation, such as visible light, pass through. Molecules of ozone absorb ultraviolet radiation. The ozone gas throughout the stratosphere is called the ozone layer. It absorbs harmful ultraviolet radiation from the Sun.

Atmospheric ozone layer which protect us from UV-B and C is getting depleted most by addition of chlorofluorocarbon.

The inherent ability of organisms to reproduce and multiply is called biotic potential.

Ozone layer depletion causes increased UV radiation levels at the Earth’s surface, which is damaging to human health. Negative effects include increases in certain types of skin cancers, eye cataracts and immune deficiency disorders.

UV radiations is injurious to plants because it causes genetic changes.

CPCB is the regulatory authority of quality in India.