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http://dx.doi.org/10.5322/JESI.2020.29.7.761

Characteristics of Summertime High PM2.5 Episodes and Meteorological Relevance in Busan  

Jeon, Byung-Il (Department of Chemical Engineering, Silla University)
Publication Information
Journal of Environmental Science International / v.29, no.7, 2020 , pp. 761-772 More about this Journal
Abstract
This research investigated the meteorologically relevant characteristics of high PM2.5 episodes in Busan. The number of days when daily mean PM10 concentration exceeded 100 ㎍/㎥ and the PM2.5 concentration exceeded 50 ㎍/㎥ over the last four years in Busan were 24 and 58, respectively. Haze occurrence frequency was 37.6% in winter, 27.4% in spring, 18.6% in fall, and 16.4% in summer. Asian dust occurrence frequency was 81.8% in spring, 9.1% in fall and winter, and 0% in summer. During summer in Busan, high PM2.5 episode occurred under the following meteorological conditions. 1) Daytime sea breeze. 2) Mist and haze present throuout the day. 3) Anti-cyclone located around the Korean peninsula. 4) Stable layer formed in the lower atmosphere. 5) Air parcel reached Busan by local transport rather than by long-range transport. These results indicate that understanding the meteorological relevance of high PM2.5 episodes could provide insight for establishing a strategy to control urban air quality.
Keywords
Meteorological relevance; Sea breeze; Haze; Stable layer; Mist and haze;
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