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. 2021 Nov 9;302:114079. doi: 10.1016/j.jenvman.2021.114079

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Fig. 4 — Establishing links of COVID-19 closure to observed air quality response. Spatial distribution of ratio of mean daily emissions of NMVOCs to NOx (ER_NMVOCs/NOx) from 25^th March 2020 to 15^th April 2020 (period of first lockdown) under (a) BASE scenario and (b) COVD scenario. (c) Correlation between ER_NMVOCs/NOx in BASE and COVD. (d) Spatial distribution of ratio of ER_NMVOCs/NOx in BASE to COVD overlayed with sites where there was recorded increase in ambient O₃ concentrations (red circles). Spatial distribution in reductions and sectoral contribution of (e) NOx and (f) NMVOCs emissions over India. (For interpretation of the references to colour in this figure legend, the reader is referred to the Web version of this article.)