High ozone events in the California South Coast Air Basin, 1986--1993: Air quality characteristics and associated meteorological conditions

Conference · Tue Dec 31 04:00:00 EST 1996

OSTI ID:422936

Blier, W; Hansen, D D; Verma, N; Winer, A M ^[1]

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1. Univ. of California, Los Angeles, CA (United States)

Air quality and meteorological data were analyzed for the subregions of the South Coast Air Basin (SoCAB) for the period 1986--1993. Decreases in daily peak hourly-average ozone values occurred throughout the SoCAB, including the Coastal and Metropolitan source regions, for both weekdays and weekend days, with the relative magnitude of the weekday decrease increasing with distance from the coast. Poor correlations were found between morning NO{sub 2} and NO{sub x} concentrations in the Coastal and Metropolitan subregions, long thought to be the primary source of the precursor pollutants, and high ozone concentrations in the downwind receptor subregions. In contrast, much better correlations were found between morning NO{sub 2} and the daily maximum ozone concentration within a particular subregion. Although 850 mb temperatures are found to be significantly warmer on high ozone days than on middle ozone days, surprisingly little difference was found between the two groups of days in the 850 mb wind and, especially, the surface winds in the SoCAB.

• OSTI ID: 422936
• Report Number(s): CONF-960127--
• Country of Publication: United States
• Language: English

Related Subjects

54 ENVIRONMENTAL SCIENCES
AIR POLLUTION
AIR POLLUTION MONITORING
CALIFORNIA
COASTAL REGIONS
ECOLOGICAL CONCENTRATION
ENVIRONMENTAL TRANSPORT
METEOROLOGY
NITROGEN OXIDES
OZONE