Air quality for ultrafine particulate matter nationwide is forecast to be "moderate" on September 14, 2026.
According to the Korea Environment Corporation’s forecast overview, all regions are expected to range from “Good” to “Moderate.”
Regarding the causes, "Concentrations increased in most of the central and western regions, as well as some inland southern areas—particularly in the central inland region—due to the accumulation of particulate matter lingering from the previous day and domestically generated particulate matter caused by stagnant air until the morning; however, concentrations are expected to decrease starting in the afternoon due to smooth vertical (upper and lower layers) dispersion, resulting in a daily average concentration of 'Moderate,'" the agency analyzed.
Since PM2.5 concentrations are not high across all regions, there should be no significant disruption to outdoor activities.
Moderate — Seoul, North Jeolla, North Gyeongsang, Daegu, South Chungcheong, North Chungcheong, Sejong, Daejeon, Southern Gyeonggi, Northern Gyeonggi (10 regions)
Good — Jeju, South Jeolla, Gwangju, South Gyeongsang, Ulsan, Busan, Yeongdong, Yeongseo, Incheon (9 regions)
※ This article was automatically generated by a robot reporter based on air quality forecast data from the Korea Environment Corporation. (Release date: September 14, 2026, 5:00 PM)
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