{"accessLevel": "public", "bureauCode": ["020:00"], "contactPoint": {"fn": "Lukas Valin", "hasEmail": "mailto:valin.lukas@epa.gov"}, "description": "Data used in this study are: (1) 24 hour averaged surface NO2 data for March-August for 2019 & 2020; (2) a total of about 328 AQS sites that have no data gaps; (3) a trend analysis for a subset of those AQS sites that extends back to 2005; and (4) OMI (2005-2020) and TROPOMI (2018-2020) satellite-based data for NO2 tropospheric columns. Note that OMI and TROPOMI make swath measurements from low Earth sun-synchronous polar orbit (i.e., global coverage each day at approximately 1 PM local standard time).  \n\nFor data associated with this paper, please contact the corresponding author Zhen Qu at zhenqu@g.harvard.edu. This dataset is not publicly accessible because: Role in this research effort as limited advisor / manuscript co-author on non-EPA and publicly available AQS datasets. It can be accessed through the following means: For data associated with this paper, contact the primary author Zhen Qu at zhenqu@g.harvard.edu. Format: N/A. \n\nThis dataset is associated with the following publication:\nQu, Z., D. Jacob, R. Silvern, V. Shah, P.C. Campbell, L. Valin, and L. Murray. US COVID-19 Shutdown Demonstrates Importance of Background NO2 in Inferring NOx Emissions From Satellite NO2 Observations.   GEOPHYSICAL RESEARCH LETTERS. American Geophysical Union, Washington, DC, USA, 48(10): e2021GL092783, (2021).", "distribution": [], "identifier": "https://doi.org/10.23719/1520960", "keyword": ["air emissions", "air quality", "nitrogen dioxide", "satellite"], "license": "https://pasteur.epa.gov/license/sciencehub-license-non-epa-generated.html", "modified": "2020-12-01", "programCode": ["020:000"], "publisher": {"name": "U.S. EPA Office of Research and Development (ORD)", "subOrganizationOf": {"name": "U.S. Environmental Protection Agency", "subOrganizationOf": {"name": "U.S. Government"}}}, "references": ["https://doi.org/10.1029/2021gl092783"], "rights": null, "title": "US COVID-19 shutdown shows importance of background NO2 in inferring nitrogen oxide (NOx) emissions from satellite NO2 observations (N/A limited co-author role)"}