Abstract
The ionic composition and pH of rainwater samples collected during the summer monsoon seasons of 1963 and 1965 at Agra and Delhi, respectively have been compared with those collected during the summer monsoon seasons of 1984 at both these cities. The pH values at Agra and Delhi have been found to have decreased by 2.8 (9.1-6.3) and 0.9 (7.0-6.1) units, respectively after the period of two decades during which the cities developed industrially to a great extent. The main cause for the decrease in the pH values is a significant increase of acidic components and decrease of soil-oriented components in the rain water. For the first time in India, long-term effects of pollutants on the pH of rain water have been observed but the effects are comparatively slow compared with those in western countries.
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