Study on surface ozone and its precursors at an urban site of Delhi, India
Continuous measurements of the surface ozone (O3), oxidess of nitrogen (NOx), carbon monooxide (CO), methane (CH4) and total non-methane hydrocarbons (TNMHCs) have been carried out at an urban site of Delhi, India during 1–31, May 2014 to study the influence of ozone precursors (NOx, CO, CH4 and TNMHCs) in the formation of surface O3 over Delhi. In the present study, the average mixing ratios of surface O3, NO, NO2, CO, CH4 and NMHCs were recorded as 37.1 ± 9.8 ppb, 20.4 ± 13.1 ppb, 14.7 ± 3.2 ppb, 1.4 ± 0.5 ppm, 2.6 ± 0.4 ppm and 0.13 ± 0.09 ppm, respectively. The surface O3, NO, NO2, CO, CH4 and TNMHCshave shown the prominent diurnal variations during study. The result reveals that the surface O3 positively correlated with NO2, TNMHCs, NO2/NO and NMHCs/NOx and influenced the surface O3 production at the observational site of Delhi.
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