《Table 2.Composition of VOCs and their proportions in the box-model setup.The numbers in the table r

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《"Influence of Atmospheric Particulate Matter on Ozone in Nanjing, China:Observational Study and Mechanistic Analysis"》

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Based on hourly data from 1 January to 31 December2008，the annual mean，standard deviation，median and maximum of PM2.5and O3concentrations were calculated，and the results are shown in Table 3.The annual mean and standard deviation values for PM2.5and O3at PK station are94.09±63.42μg m-3and 16.94±14.91 ppb，respectively.Their counterparts at CCM station are 64.63±47.41μg m-3and 24.63±22.81 ppb.The PM2.5concentrations at both sites far exceed the national standard concentration，which is 35μg m-3for the annual mean，according to the China National Ambient Air Quality Standard（China，2012）.Clearly，severe PM pollution exists both in the urban and suburban areas of Nanjing，probably originating from industry，vehicle emissions，and dust blown by winds above unpaved roads（Wang et al.，2012）.The PK site shows relatively high PM2.5and low O3levels compared with CCM，suggesting severer particulate pollution in the suburbs of Nanjing.One possible explanation is that PK station is situated near an industrial area and has mountains on both its north and southwest side（Shao et al.，2016）.The relatively higher levels of industrial emissions and worse diffusion conditions lead to the relatively higher PM2.5concentrations at PK，which may reduce the O3concentration.