Figure 1
From: Natural processes dominate the pollution levels during COVID-19 lockdown over India
Time series for (a) AOD, (b) BC, (c) NO2, (d) NO, (e) NOx, (f) SO2, (g) O3, and (h) CO obtained from WRF-Chem model simulations for March 8 to April 20, 2020 over the Gadanki region. Trace gases obtained from a gas analyser at Gadanki are superimposed on the respective panels (c–h). Skyradiometer AOD and Aethalometer BC are also superimposed in (a) and (b), respectively. Hydrophilic and hydrophobic BC and OC as simulated by WRF-Chem are also shown in (a). MODIS AOD is superimposed in (a). NO2 and SO2 from OMI are superimposed in (c) and (f), respectively. Note that model simulated O3 and CO are doubled and halved, respectively. WRF-Chem simulated outputs are represented by red lines, ground-based observations by black lines, and satellite observations by blue lines. The vertical line indicates the date on which the lockdown began. The figures are plotted using ORIGIN software (https://www.originlab.com).
