Abstract
Impact of the pollution generated by the developing industrial area in Dehra Dun – Rishikesh – Haridwar Range has been assessed by measuring concentrations of modest and most harmful pollutants like sulphur dioxide, suspended particulate matters, noxious and carbon monoxide gases for the period October, 1990 to January, 1992 by setting fifteen ambient air quality monitoring stations in the most concentrated zone with moderately polluting industries centred at Lal Tappar. The stations were set up within 10 km radius from the centre Lal Tappar. The data collected infers the zone polluted with suspended particulate matter and carbon – monoxide. On the otherhand the concentration of sulphur dioxide has been found in appreciable quantity some times more than the safer limit. The air pollution index has been calculated as a cumulative effect of SPM, SO2 and CO. The whole area has been categorised on the basis of pollution index. The variation of pollution level index correlated with standard deviation.
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