In this study, ambient NH, NO, NO, CO and SO were measured continuously from February, 2008, to December, 2016. The annual average mixing ratios (mole/mole) of NH, NO, NO, CO and SO were 17.8 ± 3.4 ppb; 21.2 ± 2.3 ppb, 18.1 ± 3.2 ppb; 1.7 ± 0.3 ppm and 2.0 ± 0.3 ppb, respectively. All the trace gases (NH, NO, NO, CO and SO) showed significant annual variation during the study. A significant increasing trend in mixing ratios of ambient NH and NO were observed at the observational site of Delhi, whereas, increasing trend were recorded in case of NO, CO and NO mixing ratios. The results emphasized that traffic could be one of the significant sources of ambient NH at the urban site of Delhi, as illustrated by positive correlations of NH with traffic related co-pollutants (NO and CO).
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