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. 2020 May 25;736:139658. doi: 10.1016/j.scitotenv.2020.139658

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Fig. 6 — Daily variability of the PM₁₀ (a, b) PM_2.5 (c, d) and NO₂ (e-f) concentrations at industrial and urban sites in Malaysia for the period 1 March – 22 April of the years 2018, 2019 and 2020. The dashed line defines the beginning of the movement control order (MCO) on March 18, 2020 due to COVID-19 pandemic. The average and standard deviation values before and after MCO in each year are provided in the graphs.