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. 2020 Nov 1;760:143382. doi: 10.1016/j.scitotenv.2020.143382

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Fig. 7 — Percentage decrease of mean NO₂ quality index by country (January – June 2020 vs January – June 2019). Detailed data for Rome, Italy in the inset. Philippines had an approximate 70% decrease of mean NO₂ quality index for the period evaluated. Details by country in Supplementary Material (Fig. S3a and b).