question_answer

 "Calcutta had a long history of air pollution." In view of this statement examine the reasons for air pollution is Calcutta.

Answer:

(i) The inhabitants of Calcutta inhaled grey smoke specially in winter.

(ii) Since the city was built on marshy land, the resulting fog combined with smoke to generated thick black smog.

(iii) High levels of pollution was a consequence of huge population that depended on dung and wood as fuel in their daily life. But the real pollutants' were industries and establishments that used steam engines run on coal.

(iv) The high content of ash in Indian coal was a problem.