Figure - PMC

Skip to main content

An official website of the United States government

Here's how you know

Here's how you know

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you've safely connected to the .gov website. Share sensitive information only on official, secure websites.

View full-text article in PMC

. 2022 Sep 5:119367. Online ahead of print. doi: 10.1016/j.atmosenv.2022.119367

Search in PMC
Search in PubMed
View in NLM Catalog
Add to search

© 2022 Published by Elsevier Ltd.

Since January 2020 Elsevier has created a COVID-19 resource centre with free information in English and Mandarin on the novel coronavirus COVID-19. The COVID-19 resource centre is hosted on Elsevier Connect, the company's public news and information website. Elsevier hereby grants permission to make all its COVID-19-related research that is available on the COVID-19 resource centre - including this research content - immediately available in PubMed Central and other publicly funded repositories, such as the WHO COVID database with rights for unrestricted research re-use and analyses in any form or by any means with acknowledgement of the original source. These permissions are granted for free by Elsevier for as long as the COVID-19 resource centre remains active.

PMC Copyright notice

Fig. 3 — Monthly averages of NO₂ tropospheric vertical column densities (TVCDs) observed by (a, c) NOAA-20 OMPS for July 2019 and (b, d) OMI for December 2019, pixels with cloud fraction of 30% and above are excluded. (e, f) Quantitative comparison of NOAA-20 OMPS and OMI monthly averaged NO₂ TVCDs at 38.625°N, from 180°W to 180°E.