Articles | Volume 19, issue 13
Atmos. Chem. Phys., 19, 8863–8878, 2019
https://doi.org/10.5194/acp-19-8863-2019
Atmos. Chem. Phys., 19, 8863–8878, 2019
https://doi.org/10.5194/acp-19-8863-2019

Research article 12 Jul 2019

Research article | 12 Jul 2019

Using satellite observations of tropospheric NO2 columns to infer long-term trends in US NOx emissions: the importance of accounting for the free tropospheric NO2 background

Rachel F. Silvern et al.

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AR: Author's response | RR: Referee report | ED: Editor decision
AR by Rachel Silvern on behalf of the Authors (24 May 2019)  Author's response    Manuscript
ED: Publish as is (03 Jun 2019) by Qiang Zhang
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Short summary
The US EPA reports a steady decrease in nitrogen oxide (NOx) emissions from fuel combustion over the 2005–2017 period, while satellite observations show a leveling off after 2009, suggesting emission reductions and related air quality gains have halted. We show the sustained decrease in NOx emissions is in fact consistent with observed trends in surface NO2 and ozone concentrations and that the flattening of the satellite trend reflects a growing influence from the non-anthropogenic background.
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