Air pollution

Lesson 15:Environmental pollution

Air pollution

Air pollution is the human introduction of chemicals, particulate matter or biological materials that causes harm or discomfort to humans or other living organisms or damages the natural environment.
The presence in the atmospheric environment of natural and artificial substances that affect human health or well- being, or the well-being of any other organism is air pollution.
Air pollution causes death and respiratory diseases. It is also one of the main reasons for ozone depletion.

Composition of air

The Earth’s atmosphere is a layer of gases surrounding the planet Earth. Dry air contains roughly 78.8% nitrogen, 20.95 % oxygen, 0.93% argon, 0.038% carbon dioxide and trace amounts of other gases.

Atmospheres with oxygen concentrations below 19.5% can have adverse physiological effects and atmospheres with less than 16% oxygen can become life threatening.
Definition: “The imbalance in quality of air so as to cause adverse effects on the living organisms existing on earth” is called air pollution.

“Presence of one or more contaminants such as fumes, dust, gases, mist, grit, odour, smoke, aerosol, smog, plume or fog in considerable quantities, which is injurious to health, of human, animal or plant life or which interferes with the comfortable enjoyment of life and prosperity” is known as air pollution.

Last modified: Friday, 30 December 2011, 7:13 AM