The main sources of pollution are:
-> Industry
-> Transports
-> Volcano eruptions
-> Natural fires
-> Dust storms
-> Housekeeping activities
The main polluter in the world is nowadays the industry. During the industrial process, harmful substances are set free into the atmosphere, causing local catastrophes when special filters are inexistent for purging the residual gases. Depending on the height of the furnaces and on the atmospheric conditions, the gases can spread locally or at big distances. All these gases will finally end up on the soil, and studies have proven the fact that up to 40 km of soil around the metallurgic works are affected by the gases these works produce.
Transports are another source of pollution. In
USA 60% of the gas pollution is caused by auto vehicles and in certain city like LA or Chicago the percentage is raised to 90%. The combustion engine is the main responsible for all this pollution. The vehicles are eliminating gases very near to the earth, leading to high concentrations of gas in the atmosphere, even for low density gases. The volume, nature and concentration of the car pollutants...
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