Direct cause and main air pollution is the human, and especially in recent centuries, with these horns enormous industrial revolutions, especially after the discovery of coal and oil and fuel, which are considered the greatest enemy of the environment and the air due to its toxic gases during combustion, as carbon monoxide gas resulting from the process of incomplete combustion of fuels and carbon dioxide resulting from the combustion process full of fuel, the carbon dioxide gas necessary for respiration, but incursions in some areas Globe on vegetation which has contributed to its decline and diminished, increased the concentration of this gas in the atmosphere, resulting in damage to animals and humans, especially since this gas is also produced from breathing in humans and animals.
One of the reasons for increasing wastes accumulation air pollution contributed to the emission of odors and toxic gases into the atmosphere, adding to the resulting radioactive pollution from nuclear explosions and other.