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International Journal of Environment Science and Technology
Center for Environment and Energy Research and Studies (CEERS)
ISSN: 1735-1472 EISSN: 1735-1472
Vol. 12, No. 5, 2015, pp. 1749-1758
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Bioline Code: st15163
Full paper language: English
Document type: Research Article
Document available free of charge
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International Journal of Environment Science and Technology, Vol. 12, No. 5, 2015, pp. 1749-1758
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Environmental monitoring of surface ozone and other trace gases over different time scales: chemistry, transport and modeling
Venkanna, R.; Nikhil, G.N.; Siva Rao, T.; Sinha, P.R. & Swamy, Y.V.
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 (HO2) 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
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