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. 2020 Aug 25;47(17):e2020GL088913. doi: 10.1029/2020GL088913

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©2020. American Geophysical Union. All Rights Reserved.

This article is being made freely available through PubMed Central as part of the COVID-19 public health emergency response. It can be used for unrestricted research re-use and analysis in any form or by any means with acknowledgement of the original source, for the duration of the public health emergency.

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Change in pollution over China for February 2020. (left column) Observed values, (middle column) estimated values, and (right column) their difference are shown for (top row) NO₂, (middle row) AOD, and (bottom row) r _e. Shading is such that lighter (left and middle columns) and greener (right column) colors align with what would be expected for less pollution. Areas without valid data are shaded in gray. Gray stippling indicates absolute differences below 2ε _RMS. Black boxes in the right column indicate areas used for the regional averages.