@Article{acp-19-8863-2019,
AUTHOR = {Silvern, R. F. and Jacob, D. J. and Mickley, L. J. and Sulprizio, M. P. and Travis, K. R. and Marais, E. A. and Cohen, R. C. and Laughner, J. L. and Choi, S. and Joiner, J. and Lamsal, L. N.},
TITLE = {Using satellite observations of tropospheric \chem{NO_{2}} columns to infer long-term trends in US \chem{NO_\mathit{x}} emissions:~the importance of accounting for
the free tropospheric \chem{NO_{2}} background},
JOURNAL = {Atmospheric Chemistry and Physics},
VOLUME = {19},
YEAR = {2019},
NUMBER = {13},
PAGES = {8863--8878},
URL = {https://acp.copernicus.org/articles/19/8863/2019/},
DOI = {10.5194/acp-19-8863-2019}
}