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. 2020 Dec 29;66:102688. doi: 10.1016/j.scs.2020.102688

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Fig. 4 — 7-day moving average time-series of surface measured pollutants PM_2.5(A), PM₁₀ (B), NO₂(C), SO₂(D), O₃(E) and CO (F) in Bengaluru (BEN), Chennai (CHN), Delhi (DEL), Kolkata (KOL), Mumbai (MUM) and Pune (PNE). The red line (shaded region) shows 7-day moving average for previous years i.e. 2017-19 (Std. deviation) and the green line indicates 7-day moving average for present year i.e. 2020.