However, the decreasing extent of NO 2 VCDs was not quite significant, and even some regions revealed higher NO 2 values in 2020 (Fig. 1 ).
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The implication of the air quality pattern in South Korea after the COVID-19 outbreak.
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However, the decreasing extent of NO 2 VCDs was not quite significant, and even some regions revealed higher NO 2 values in 2020 (Fig. 1 ).