Seasonal variability of ambient NH3, NO, NO2 and SO2 over Delhi
S. K. Sharma , A. Datta , T. Saud , M. Saxena , T. K. Mandal , Y. N. Ahammed , B. C. Arya
DOI:
Received May 29, 2009,Revised August 14, 2009, Accepted , Available online
Volume 22,2010,Pages 1023-1028
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We present the diurnal and seasonal variability of ambient NH3, NO, NO2 and SO2 over Delhi, India. Ambient NH3, NO and
NO2 were measured continuously during winter, summer and autumn seasons using NH3- and NOx-analyzer, which operates by
chemiluminescence method with a higher estimation e ciency (> 90%) than the chemical trap method (reproducibility 4.7%).
Prominent diurnal, day-to-day and seasonal variations of ambient mixing ratio of NH3, NO, NO2 and SO2 were observed during
the study period. Seasonal variation with higher mixing ratio in winter was observed for all measured trace gases except NO. Day-night
variation of all measured trace gases observed was higher in winter in comparison with summer. Late morning increase in NO2 mixing
ratio might be attributed to conversion of NO to NO2 with the interaction of O3.
