Spatial variations of ground level ozone concentrations in areas of different scales

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Abstract

The spatial variation of ground level ozone concentrations was investigated for areas of three different scales: (1) an air quality management district (a region about 100×70km2) in northern Taiwan, (2) the neighborhood (about 2km in radius) of an air quality monitoring station, and (3) an open field (about 400×600m2) surrounded by 3- and 4-story buildings in an elementary school. Analysis of data on hourly ozone concentration, obtained at 13m above the ground at 21 monitoring stations in the air quality management district, showed that the stations downwind of the urban center in the district had significantly higher ozone concentrations. Measurements for 8-h average ozone concentrations at 1.5m above the ground by passive samplers showed that, in a flat area about 2km in radius, the ratios of the ozone concentration at open areas to that at the monitoring station (0.86-0.93) were significantly higher than those obtained at areas with higher traffic flow and density of buildings (0.60-0.68). For the open field in an elementary school, the 8-h average ozone concentrations at 1.5m above the ground at sites less than 10m from the nearest building were considerably lower than those at sites farther away from buildings. The results indicated that, in areas of small scales, the spatial distributions of ozone concentration were highly non-uniform and there were appreciable day-to-day variability in spatial distribution. Such variability should be taken into account in determining the extent to which an individual is exposed to ozone. Copyright © 2001 Elsevier Science Ltd.

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Lin, T. Y., Young, L. H., & Wang, C. S. (2001). Spatial variations of ground level ozone concentrations in areas of different scales. Atmospheric Environment, 35(33), 5799–5807. https://doi.org/10.1016/S1352-2310(01)00352-1

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