@Article{acp-12-12197-2012,
AUTHOR = {Russell, A. R. and Valin, L. C. and Cohen, R. C.},
TITLE = {Trends in OMI NO$_{2}$ observations over the United States: effects of emission control technology and the economic recession},
JOURNAL = {Atmospheric Chemistry and Physics},
VOLUME = {12},
YEAR = {2012},
NUMBER = {24},
PAGES = {12197--12209},
URL = {http://www.atmos-chem-phys.net/12/12197/2012/},
DOI = {10.5194/acp-12-12197-2012}
}