Air quality for ultrafine particulate matter nationwide is forecast to be "Good" on September 30, 2026.
According to the Korea Environment Corporation’s forecast overview, all regions are expected to range from “Good” to “Moderate.”
Regarding the causes, the agency stated, “In some western regions, concentrations of domestically generated fine dust are expected to rise until the morning due to atmospheric stagnation and converging air currents; however, concentrations will decrease in the afternoon due to smooth atmospheric dispersion. Additionally, foreign fine dust at the ‘Moderate’ level is expected to flow in along northwesterly air currents at night, resulting in a daily average concentration of ‘Moderate.’”
Since PM2.5 concentrations will not be high across all regions, there should be no major disruption to outdoor activities.
Moderate — Seoul, North Jeolla, South Chungcheong, Southern Gyeonggi, Incheon (5 areas)
Good — Jeju, South Jeolla, Gwangju, South Gyeongsang, North Gyeongsang, Ulsan, Daegu, Busan, North Chungcheong, Sejong, Daejeon, Yeongdong, Yeongseo, Northern Gyeonggi (14 areas)
※ This article was automatically generated by a robot reporter based on air quality forecast data from the Korea Environment Corporation. (Release date: September 30, 2026, 5:00 a.m.)
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