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dc.contributor.authorWang, Yuxuan
dc.contributor.authorHao, Jiming
dc.contributor.authorMcElroy, Michael Brendon
dc.contributor.authorMunger, J. William
dc.contributor.authorMa, Hong
dc.contributor.authorChen, Dan
dc.contributor.authorNielsen, Chris
dc.date.accessioned2011-07-22T19:27:07Z
dc.date.issued2009
dc.identifier.citationWang, Yuxuan, Jiming Hao, Michael B. McElroy, J. William Munger, Hong Ma, Dan Chen, and Chris P. Nielsen. 2009. Ozone air quality during the 2008 Beijing Olympics: Effectiveness of emission restrictions. Atmospheric Chemistry and Physics 9: 5237-5251.en_US
dc.identifier.issn1680-7316en_US
dc.identifier.urihttp://nrs.harvard.edu/urn-3:HUL.InstRepos:5029361
dc.description.abstractA series of aggressive measures was launched by the Chinese government to reduce pollutant emissions from Beijing and surrounding areas during the Olympic Games. Observations at Miyun, a rural site 100 km downwind of the Beijing urban center, show significant decreases in concentrations of O3, CO, NOy, and SO2 during August 2008, relative to August 2006–2007. The mean daytime mixing ratio of O3 was lower by about 15 ppbv, reduced to 50 ppbv, in August 2008. The relative reductions in daytime SO2, CO, and NOy were 61%, 25%, and 21%, respectively. Changes in SO2 and in species correlations from 2007 to 2008 indicate that emissions of SO2, CO, and NOx were reduced at least by 60%, 32%, and 36%, respectively, during the Olympics. Analysis of meteorological conditions and interpretation of observations using a chemical transport model suggest that although the day-to-day variability in ozone is driven mostly by meteorology, the reduction in emissions of ozone precursors associated with the Olympic Games had a significant contribution to the observed decrease in O3 during August 2008, accounting for 80% of the O3 reduction for the month as a whole and 45% during the Olympics Period (8–24 August). The model predicts that emission restrictions such as those implemented during the Olympics can affect O3 far beyond the Beijing urban area, resulting in reductions in boundary layer O3 of 2–10 ppbv over a large region of the North China Plain and Northeastern China.en_US
dc.description.sponsorshipEngineering and Applied Sciencesen_US
dc.language.isoen_USen_US
dc.publisherCopernicus Publicationsen_US
dc.relation.isversionofhttp://www.atmos-chem-phys.net/9/5237/2009/en_US
dash.licenseOAP
dc.titleOzone Air Quality During the 2008 Beijing Olympics: Effectiveness of Emission Restrictionsen_US
dc.typeJournal Articleen_US
dc.description.versionAccepted Manuscripten_US
dc.relation.journalAtmospheric Chemistry and Physicsen_US
dash.depositing.authorMcElroy, Michael Brendon
dc.date.available2011-07-22T19:27:07Z
dc.identifier.doi10.5194/acpd-9-9927-2009
dash.contributor.affiliatedMcElroy, Michael
dash.contributor.affiliatedMunger, J.
dash.contributor.affiliatedNielsen, Chris


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