A preliminary look at ambient NOx (oxides of nitrogen) concentration trends in the United States
- Environmental Protection Agency, Research Triangle Park, NC (United States)
Hourly data were available for 1995 Reactive Oxides of Nitrogen (NOy), 1993 to 1995 Total Non-Methane Organic Compounds (TNMOC), and 1993-1995 for NOx and Nitric Oxide (NO) ambient concentrations. Hourly data were used to investigate weekend vs weekday differences and to compare National, Ozone Transport Assessment Group (OTAG), and Photochemical Ambient Monitoring Stations (PAMS) regions. For NOy, NOx, and NO, Sunday always had the lowest average concentration and Saturday was almost always second to the lowest. For TNMOC, the difference was not as apparent. Annual and Quarterly mean data were available for 1986-1995 NO and NOx ambient concentrations. Annual and Quarterly data were used to compare with emissions maps and trends and to compare National, OTAG, and PAMS regions. The National Annual NOx ambient concentration trend was close to the National Annual NOx Emissions trend with a few minor differences. The national area almost always having concentrations less than the OTAG and PAMS areas verifies the emissions maps.
- OSTI ID:
- 617794
- Report Number(s):
- CONF-9704195--
- Country of Publication:
- United States
- Language:
- English
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