Fig. 2: Impacts of COVID-19 lockdown and meteorology on ozone and Ox (Ox = O3 + NO2) in YRD region. | npj Climate and Atmospheric Science

Fig. 2: Impacts of COVID-19 lockdown and meteorology on ozone and Ox (Ox = O3 + NO2) in YRD region.

From: Seasonality and reduced nitric oxide titration dominated ozone increase during COVID-19 lockdown in eastern China

Fig. 2

Impact of lockdown emission reduction and meteorology on a The average O3. b Ozone diurnal pattern. c The average Ox. d Ox diurnal pattern. “Pre-C”, average concentrations before lockdown. “Lockdown”, average concentrations during lockdown. “Met”, meteorology impact was calculated as the difference between before and during the lockdown in the Base case and scaled by observations. “COVID-NOx”, the impact of NOx reductions during the lockdown, calculated by the modeled differences between the Base case and COVID-NOx case (the same as the COVID case but without VOCs reductions) during the lockdown period and scaled by observations. “COVID-VOCs”, the impact of VOCs reductions during lockdown period, calculated by the differences between the COVID case and COVID-NOx case (without NOx reductions) during lockdown period and scaled by observations.

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