Figure 2
From: The implication of the air quality pattern in South Korea after the COVID-19 outbreak

Percentiles of the observed surfaces of the GOCI AOD at 550 nm in (a) Seoul and (b) Daegu, and OMI NO2 VCD in (c) Seoul and (d) Daegu, South Korea for January, February, and March. (The 10th, 50th, and 90th percentiles of January, February, and March are compared for 3 periods: 2016–2020 (gray), 2019 (yellow), and 2020 (blue).