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. 2020 Aug 4;750:141521. doi: 10.1016/j.scitotenv.2020.141521

Fig. 2.

Fig. 2

Daily mean concentrations of air pollutants in Korea, between December 1 and April 30 of recent four years.

(A) PM2.5 (B) PM10 (C) NO2 (D) CO.

Highlighted shadow presents social distancing period.

Korean daily air quality standard.