Impacts of Chemical and Synoptic Processes on Summer Tropospheric Ozone Trend in North China
(a) Regional ozone-NOx-VOC sensitivity characteristics in summer in the NCP. The contours are the tropospheric O3 column concentrations (units: DU). (b) Comparison of FNR in major cities for two phases (2005–2011 and 2012–2016) from remote sensing. FNR is defined as the ratio of tropospheric HCHO column concentration to tropospheric NO2 column concentration.
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