Causes+of+Air+Pollution


 * Causes of Air Pollution **
 * Carbon Dioxide
 * although living beings do exhale carbon dioxide, this gas is harmful when emitted from other sources, which are caused due to human activity.
 * used in various industries such as the oil industry and the chemical industry.
 * The combustion of fuels in automobiles, jet planes etc all cause the release of several primary pollutants into the air
 * The burning of fossil fuels in big cities which is seen at most factories, offices and even a large number of homes
 * number of power plants and manufacturing units or industries that mostly have activities related to the burning of fuels
 * Carbon monoxide
 * produced due to any fuel burning appliance and appliances such as gas water heaters, fireplaces, woodstoves, gas stoves, gas dryers, yard equipments as well as automobiles
 * Sulfur dioxide
 * emitted largely to the excessive burning of fossil fuels, petroleum refineries, chemical and coal burning power plants etc.
 * Nitrogen dioxide
 * excess of nitrogen dioxide mainly happens due to most power plants seen in major cities, the burning of fuels due to various motor vehicles and other such sources
 * Sulfur and chlorofluorocarbons (CFCs)
 * produced by combustion of sulfur-containing fuels, such as coal and fuel oils
 * irritates the upper respiratory tract of human beings because potential effect of sulfur dioxide is to make breathing more difficult by causing the finer air tubes of the lung to constrict.
 * As emissions of sulfur dioxide and nitric oxide from stationary sources are transported long distances by winds, they form secondary pollutants such as nitrogen dioxide, nitric acid vapor, and droplets containing solutions of sulfuric acid, sulfate, and nitrate salts. These chemicals descend to the earth's surface in wet form as rain or snow and in dry form as a gases fog, dew, or solid particles. This is known as acid deposition or acid rain.
 * Chlorofluorocarbons (CFCs)
 * Spray cans, discarded or leaking refrigeration and air conditioning equipment, and the burning plastic foam products release the CFCs into the atmosphere.
 * Under high energy ultra violet (UV) radiation, they break down and release chlorine atoms, which speed up the breakdown of ozone (O3) into oxygen gas (O2
 * Chlorofluorocarbons, also known as Freons, are greenhouse gases that contribute to global warming