Influence of ozone precursors and PM10 on the variation of surface O3 over Kannur, India

Abstract This paper presents the results of the continuous measurements of surface ozone (O 3 ), oxides of nitrogen (NO x ) and methane (CH 4 ) in a rural coastal location at Kannur (11.9° N, 75.4°E, 5 m AMSL), India from November 2009 to December 2012. The maximum and minimum mixing ratios of surface O 3 were observed in winter and monsoon seasons respectively. NO x concentration was high during mid-night to early morning and low during noontime. The diurnal variations of mixing ratios for NO x and O 3 were anti-correlated. Monthly average maximum and minimum CH 4 concentrations were observed in December and August respectively. The diurnal variations of CH 4 were quite similar to that of NO x . A gradual build up of CH 4 was observed during early morning hours of all days throughout the observational period. Further, the analyses of O 3 , NO, NO 2 and NO x have been carried out and the correlation between O 3 and its precursors is discussed in detail. The chemical analysis of air samples conducted to identify the main inorganic species present in air and their significance is presented. An attempt has been made to investigate the impact of concentration of Particulate Matter (PM 10 ) present in the ambient air on the production of surface O 3 at this location to explore the influence of PM 10 on surface O 3 .

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