On August 21, 2026, the nationwide air quality for ultrafine particulate matter is forecast to be "Good."
According to the Korea Environment Corporation’s forecast overview, all regions are expected to be rated “Good” to “Moderate.”
Regarding the causes, the agency analyzed: “In some central and western regions, concentrations will be high until dawn due to the accumulation of fine particulate matter remaining from the previous day and domestically generated particulate matter caused by airflow convergence; however, concentrations are expected to decrease thereafter due to smooth vertical (upper and lower layers) dispersion, resulting in a daily average concentration of ‘Moderate.’”
Since PM2.5 concentrations will not be high across all regions, outdoor activities are not expected to be significantly affected.
Moderate — Seoul, Southern Gyeonggi, Northern Gyeonggi, Incheon (4 regions)
Good — Jeju, South Jeolla, North Jeolla, Gwangju, South Gyeongsang, North Gyeongsang, Ulsan, Daegu, Busan, South Chungcheong, North Chungcheong, Sejong, Daejeon, Yeongdong, Yeongseo (15 regions)
※ This article was automatically generated by a robot reporter based on air quality forecast data from the Korea Environment Corporation. (Release date: August 21, 2026, 5:00 a.m.)
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