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Chemical composition of rainwater around an industrial region in Mumbai

2003; Elsevier BV; Volume: 44; Issue: 4 Linguagem: Inglês

10.1016/s0140-6701(03)82152-5

1873-7161

Medha S. Naik, G.A. Momin, P.S.P. Rao, P.D. Safai, Kaushar Ali,

Water Quality and Pollution Assessment

Chemical analysis of rainwater samples collected at Kalyan, a downwind location of a large industrial belt, and at Alibag and Colaba, the upwind locations, during the southwest monsoon seasons of 1994 and 1995 and comparison with similar data of 1973-74 reveal that pH of rainwater at Kalyan which was alkaline 20 years ago became acidic due to long-term effect of pollutants. A decreasing trend in excess SO4 was observed at Colaba and Kalyan, which is attributed to the pollution control measures adopted by industries and switching over from coal to natural gas which contains low sulphur. Whereas the increasing trend in NOx observed at Kalyan and Colaba, is attributable to increased automobile emission.