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Environmental Pollution 75 (1992) 39-44 Ozone in the urban southeastern United States
 

Summary: Environmental Pollution 75 (1992) 39-44
Ozone in the urban southeastern United States
Viney P. Aneja, Gary T. Yoder & S. Pal Arya
Department of Marine, Earth and Atmospheric Sciences,
North Carolina State University, Raleigh, North Carolina, 27695~8208, USA
Ozone measurements (daily maximum values) from the Aerometric Information
Retrieval System database are analyzed for selected sites, during 1980 to 1988, in
southeastern USA. Frequency distributions, for most sites during most years,
show a typical bell-shaped curve with the higher frequency around the yearly
daily maximum ozone mean of about 100 to about 110/xg m-3 (50-55 ppbv).
Abnormal years in ozone concentration may skew the distribution as the mean
shifts. A correlation of daily maximum ozone concentrations above 140 p~g m-3
(70 ppbv) between sites shows a division between the sites in the northern por-
tion of the region and those in the southern portion of the region. Variations in
ozone levels are well correlated over distances of several hundred kilometers, sug-
gesting that high values are associated with synoptic scale episodes. An ozone ex-
posure analysis also shows higher ozone exposures (250-300 ppm days) in the
northerly sites as compared to the southerly sites (150-170 ppm days).
INTRODUCTION
Atmospheric photochemical oxidants comprise a class of

  

Source: Aneja, Viney P. - Department of Marine, Earth and Atmospheric Sciences, North Carolina State University

 

Collections: Environmental Sciences and Ecology; Geosciences