Volume No. 6 Issue No.: 4 Page No.: 1127-1132 April-June 2012




Mishra A., Singh A. K., Singh K. A., Pandey P., Yadav S., Khan A.H.* and Barman S.C.

Environment Monitoring Division, Indian Institute of Toxicology Research, Mahatma Gandhi Road, Lucknow (INDIA)


Received on : March 25,2012




Rain water is the purest form of water until it is contaminated by the atmospheric pollution. It is the source to surface and ground water recharge. If ground water recharge takes place with uncontaminated rain water, it remains fit for drinking purposes. On the other hand rain water is an efficient pathway for removing the gases and particles from the atmosphere, which determines the composition of rain water. The composition of rain water varies from site to site and region to region due to interference of local sources of air contaminants. Thus study on air pollution levels and rain water characterization was carried out in Lucknow city, (India) during monsoon season to better understand the relation between the two. Precipitation includes all forms of water that condense in the atmosphere and fall to the ground. Unpolluted precipitation is frequently assumed to have a pH above 5.6, the same value as pure water in equilibrium with the global atmospheric concentration of carbon dioxide (330 ppm). The urban air pollution may cause direct as well as indirect effect on rain water and leads to acid rain. This paper represents the ambient air quality data of selected locations in the Lucknow city during study period for air quality parameters i.e. respirable particulate matter (PM10), sulphur dioxide (SO2) and oxides of nitrogen (NOx) and rain water quality from two locations i.e. IITR Campus and Daliganj for parameters : pH, Total Dissolved Solids, Electrical Conductivity, Chloride, Alkalinity, CO2, Hardness, Sulphide and Acidity. The maximum values of pH, chloride and carbon dioxide were recorded as 7.39, 17.04 mg/l and 9.2 mg/l during the initial rains. Further the values decreased to 6.24, 5.98 mg/l and 2.2 mg/l for respective parameters as rainy season progressed which reflects contamination of rain water from air pollution.


Keywords : Acid rain, Sulphur dioxide, Oxides of nitrogen, pH, Electrical Conductivity