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Environmental monitoring of surface ozone and other trace gases over different time scales: chemistry, transport and modeling

  • R. Venkanna
  • G. N. Nikhil
  • T. Siva Rao
  • P. R. Sinha
  • Y. V. Swamy
Original Paper

Abstract

Increasing concentration of tropospheric ozone (O3) is a serious air pollution problem faced commonly by the urban people. The present study emphasizes on variations of air pollutant concentrations viz., O3, nitrogen oxides (NOx), carbon monoxide (CO), sulfur dioxide (SO2) and black carbon (BC) at a tropical urban site located in the Deccan plateau region with semi-arid climate. The air monitoring site revealed typical diurnal/seasonal trends attributing to the complex chemistry of surface O3 formation from its precursors. Role of SO2 in the formation of free radical (\( {\text{HO}}_{2}^{ \cdot } \)) and its impact on O3 concentration is distinguished part of the study. The results showed the highest mean O3 in summer (57.5 ± 15.2 ppbv) followed by winter and monsoon. Observations of BC aerosols showed the highest mean value during winter (8.2 ± 2 μg m−3) and the lowest in monsoon (4.2 ± 1 μg m−3). Besides local influences, long-range transport of air masses were also studied by simulating back trajectories at different elevations during the study period. Furthermore, statistical analysis and modeling was performed with both linear (regression) and nonlinear (neural network) methods.

Keywords

Air pollutants Back trajectory Modeling Photochemistry Statistics 

Notes

Acknowledgments

The authors wish to thank the Director, Indian Institute of Chemical Technology, for encouragement and support. Fruitful discussions and constant support extended by Prof. Shyam Lal and Dr. C.B.S Dutt and Dr. P.P.N Rao Programme Director during the course of this project is highly acknowledged. We also acknowledge AT/CTM under ISRO-GBP trace gas programme for financial support and Tata Institute of Fundamental Research (National Balloon Facility) at Hyderabad for providing laboratory space. The authors would like to extend their gratitude to the NOAA-ARL (HYSPLIT), for providing the data for trajectory simulations.

Conflict of interest

The authors have declared no conflict of interest.

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Copyright information

© Islamic Azad University (IAU) 2014

Authors and Affiliations

  • R. Venkanna
    • 1
  • G. N. Nikhil
    • 1
  • T. Siva Rao
    • 2
  • P. R. Sinha
    • 3
  • Y. V. Swamy
    • 1
  1. 1.Bioengineering and Environmental SciencesIndian Institute of Chemical TechnologyHyderabadIndia
  2. 2.Department of Inorganic and Analytical Chemistry, College of Science and TechnologyAndhra UniversityVisakhapatnamIndia
  3. 3.National Balloon FacilityTata Institute of Fundamental ResearchHyderabadIndia

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