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. 2020 Jul 21;745:141023. doi: 10.1016/j.scitotenv.2020.141023

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Fig. 3 — (a) Climatological (2005–2019) tropospheric NO₂ vertical column density (VCDs) observed by OMI during lunar new year (LNY) holiday seasons in East China. (b) Tropospheric NO₂ reductions in 2020 observed by OMI relative to the 2005–2019 climatological mean from OMI. (c) Same as (b) but using TROPOMI 2020 data. All OMI/TROPOMI level 3 data are corrected using Eqs. (1), (2), (3).