*AIR POLLUTION* 

             The term "air pollution" is used to describe substances that are artificially introduced into the air. Air pollution is considered one of the most dangerous kinds of pollution.So in my essay i will have this object from three sides.First of all, i will mention some causes of this phenomenon. second ,air pollution endangers human health or produces other measured effects on living matter and other materials.And finally some solutions to eliminate air pollution.



           
              There are many causes of this dangerous phenomenon and i am going to introduce them now .For the establishment of factories, industries and due to urbanization in various parts of the world, trees are cut on a large scale without any adequate efforts to plant new trees. This leads to deforestation, which has caused a rise in the pollution levels and distortion of natural order. Each year industrially developed countries generate billions of tons of pollutants. Many pollutants come from directly identifiable sources; sulphur dioxide, for example, comes from electric power plants burning coal or oil. Others are formed through the action of sunlight on previously emitted reactive materials (called precursors). For example, ozone, a dangerous pollutant in smog, is produced by the interaction of hydrocarbons and nitrogen oxides under the influence of sunlight. Ozone has also caused serious crop damage. The increasing number of vehicles have also lead to an increase in Air Pollution,. Gases generated in the Chemical plants also cause air pollution. People suffer because of smoke and bad smell from the industrial units particularly from chemical plants.
           
           Of the suite of pollutants that taint urban air, fine suspended particulate matter, sulphur dioxide (SO2), and ozone pose the most widespread and acute risks; however, airborne lead pollution is a critical concern in many cities as well. Recent studies on the effects of chronic exposure to air pollution have singled out particulate matter as the pollutant most responsible for the life-shortening effect of unhealthy air, although other pollutants may also play an important role. These pollutants cause respiratory and other health disorders.

           Various countries have set standards in legislation in the form of concentration levels that are believed to be low enough to protect public health. Source emission standards are also specified to limit the discharge of pollutants into the air, so that air-quality standards will be achieved. However, the nature of the problem requires the implementation of international environmental treaties.  In addition, several international protocols have been aimed specifically at reducing the incidence of acid rain. Awareness among masses, regarding the adverse effects of pollution around the world, can also help in reducing the intensity of pollution. This awareness can be created through various media like newspapers, television, radio, flyers, seminars, etc.
       
          Finally this problem of air pollution is considered real risk. It has many reasons. But we can come over them.And with this way we can protect human life from many dangers.