Sharma, S. K. and -, Rohtash and Mandal, T. K. and Deb, N. C. and Pal, S. (2016) Measurement of Ambient NH3, NO and NO2 at an Urban Area of Kolkata, India. Mapan, 31 (1). 75-80 . ISSN 0970-3950

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Mixing ratios of ambient NH3, NO and NO2 were measured in campaign mode at Kolkata a megacity of Indo-Gangetic plain of India to study the diurnal variation and mixing ratios of NH3, NO and NO2 during 24-27 February 2012. The present study has been carried out on campaign based measurement of mixing ratios of NH3, NO and NO2 for short period of time at Kolkata represent the indicative values over the region. The average mixing ratios of ambient NH3, NO and NO2 were recorded as 43.4 +/- A 7.0 ppb, 46.0 +/- A 8.7 ppb and 31.9 +/- A 5.5 ppb at Kolkata. In the present case, significant diurnal variation of NH3, NO and NO2 were recorded at Kolkata during study. Mixing ratio of ambient NH3 reaches its maxima (78.9 ppb) at night and minimum during daytime. Result reveals that the ambient NH3 mixing ratio is positively correlated with ambient NO (r (2) = 0.395) and NO2 (r (2) = 0.404) mixing ratio and significant negatively correlated with ambient temperature (r (2) = -0.669). Surface wind direction and wind speed analysis indicates that the local acitivities (livestock, drainage, agriculture, vehicles etc.,) may be the possible sources of ambient NH3 at the observational site of Kolkata.

Item Type: Article
Additional Information: Copyright for this article belongs to M/s Springer Verlag.
Subjects: Instruments/ Instrumentation
Applied Physics/Condensed Matter
Depositing User: Dr. Rajpal Walke
Date Deposited: 30 Jan 2018 11:24
Last Modified: 30 Jan 2018 11:24

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