Back to matchesWe found a matchYour institution may have rights to this item. Sign in to continue.TitleDecadal change in carbon monoxide to nitrogen oxide ratio in U.S. vehicular emissions.AuthorsParrish, D. D.; Trainer, M.; Hereid, D.; Williams, E. J.; Olszyna, K. J.; Harley, R. A.; Meagher, J. F.; Fehsenfeld, F. C.PublicationJournal of Geophysical Research. Atmospheres, 2002, Vol 107, Issue D12, pACH 5-1ISSN2169-897XPublication typeArticleDOI10.1029/2001JD000720