question_answer 11)

List any three human activities that you think would lead to air pollution.  

Answer:

The following activities lead to air pollution: (i) Excessive burning of fossil fuels, i.e., coal and petroleum produces high amount of oxides of nitrogen and sulphur. These oxides mix with air and cause acid rain leading to many harmful effects. (ii) Many industries release high amount of poisonous gases into the atmosphere causing air pollution. (iii) Forest fires, excessive use of chlorofluorocarbons (CFCs) used in refrigerators, excessive mining and ore refining release harmful gases into the air leading to pollution.