Vertical Stratification of Ozone in Different Seasons in the Lower Troposphere of New Delhi

Vertical ozone measurements were carried out in the urban environment of New Delhi, in three different seasons from 1989-1991. Air sampling was done synoptically at ground level, 23m, 51m, 57m, 117m and 153m heights. A significant positive vertical gradient in the ozone concentration was observed at all sites. At any given time, ozone levels were lowest at the ground level and invariably increased with increasing distance from the ground. A distinct seasonal variation in the vertical ozone profile was also observed. Ozone concentration was highest in summer at all heights. The peak in ozone concentration during the day, appeared earlier at all heights in summers, in comparison to winter and spring. At the 51m height in summers, the ozone concentration decreased rapidly during the late evening. Such vertical ozone stratification may have severe implications for trees and residents of high rise buildings particularly in urban and industrial conglomerations which serve as the prime foci in the release of ozone forming substances.

並列關鍵字

Ozone pollution ； Oxidant ； Tropospheric ozone ； Vertical variation ； Air quality

國際替代計量

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