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Abstract
Representative sampling of rainwater has been carried out in Greater Bombay and its neighbourhood during the SW monsoon period of 1974. It is estimated that on the average ∼200 kg ha−1 sea salt is deposited here, each monsoon. A high ‘excess’ of Ca is observed throughout Bombay, including relatively unpolluted places. The source of this excess is seen to be non-marine. The mean pH, ionic balance and salinity of rainwater has been used to characterise different areas of Bombay in varying degrees of pollution.