write a presentation of air pollution
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Air pollution occurs when harmful or excessive quantities of substances are ... from uncontrolled biomass combustion can make up almost 75% of all air pollution by concentration.
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Air pollution is a type of environmental pollution that affects the air and is usually caused by smoke or other harmful gases, mainly oxides of carbon, sulphur and nitrogen. In other words, air pollution is the contamination of air due to the presence or introduction of a substance which has a poisonous effect.
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