associations of trace gases and meteorological parameters and particulate matter with ozone under smog conditions

This work investigated the connection between o3 and other pollutants and meteorological conditions during a smog episode in delhi. ozone concentrations varied from site to site (150~269µg/m3). a significant negative correlation has been observed between o3 and its precursor gases. wind speed showed a positive correlation, but high wind usually dilutes the pollutant concentrations. thus, a positive correlation with wind speed represents ozone transport from other locations to observational sites. the high ratio of pm2.5 to pm10 indicates a predominance of human involvement. toluene and benzene ratios(t/b) are estimated to understand the nature of emission sources and the lifetime of pollution. the analysis of the benzene and toluene fractions indicates anthropogenic air masses' dominance. very high t/b values at several sites indicated that benzene was emitted from vehicular emission while toluene was from point sources. ozone formation potential analysis showed that toluene and p-xylene are the prime contributors to ozone.