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Four-year measurements of trace gases (SO2, NOx, CO, and O3) at an urban location, Kanpur, in Northern India

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Abstract

In this study, we present long-term near-surface measurements of sulfur dioxide (SO2), oxides of nitrogen (NOx), carbon monoxide (CO), and ozone (O3) carried out at an urban location, Kanpur (26.46°N, 80.33°E, 125 m amsl), in Northern India from June 2009 to May 2013. The mean concentrations of SO2, NOx, CO, and O3 over the entire study period were 3.0, 5.7, 721, and 27.9 ppb, respectively. SO2, NOx and CO concentrations were highest during the winter season, whereas O3 concentration peaked during summer. The former could be attributed mainly to the near-surface anthropogenic sources (e.g. automobiles, residential cooking, brick kilns, coal-burning power plants, agricultural land-clearing, and biomass burning) and low mixing height in winter, whereas the latter was clearly due to enhanced chemical production of O3 during the pre-monsoon (i.e. summer) season. The lowest concentration of all trace gases were observed during the monsoon season, due to efficient wet scavenging by precipitation. The averaged diurnal patterns also showed similar seasonal variation. NOx and CO showed peaks during morning and evening traffic hours and a valley in the afternoon irrespective of the seasons, clearly linked to the boundary layer height evolution. Contrarily, O3 depicted a reverse pattern with highest concentrations during afternoon hours and lowest in the morning hours. The mean rate of change of O3 concentrations (dO3/dt) during the morning hours (08:00 to 11:00 h) and evening hours (17:00 to 19:00 h) at Kanpur were 3.3 ppb h−1 and −2.6 ppb h−1, respectively. O3 followed a positive linear relationship with temperature, except in post-monsoon season while the strong negative with the relative humidity in all seasons. The ventilation coefficient was found to be highest in the pre-monsoon season (15,622 m2 s−1) and lowest during winter (2564 m2 s−1), indicative of excellent pollution dispersion efficiency during the pre-monsoon season. However, the low ventilation coefficient during winter and post-monsoon seasons indicated that the high-pollution potential occurs at this site.

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Acknowledgments

The authors are thankful to the Indian Space Research Organization Geosphere-Biosphere Programme (ISRO-GBP) for financial assistance under Atmospheric Trace Gases - Chemistry, Transport and Modeling (AT-CTM) Programme of the Department of Space, Government of India. We acknowledge NOAA ARL for providing HYSPLIT air mass back trajectory calculations and University of Maryland for MODIS fire count data. Authors are also grateful to the Reviewers’ for their constructive comments and suggestions.

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Correspondence to S. N. Tripathi or V. P. Kanawade.

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Gaur, A., Tripathi, S.N., Kanawade, V.P. et al. Four-year measurements of trace gases (SO2, NOx, CO, and O3) at an urban location, Kanpur, in Northern India. J Atmos Chem 71, 283–301 (2014). https://doi.org/10.1007/s10874-014-9295-8

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