On July 18, 2026, the nationwide air quality for ultrafine particulate matter is forecast to be at the "Good" level.
According to the Korea Environment Corporation’s forecast overview, all regions are expected to range from “Good” to “Moderate.”
Regarding the causes, the agency analyzed, “In some southeastern regions, concentrations will rise in the morning as fine dust lingering from the previous day accumulates due to stagnant air and converging air currents; however, concentrations will decrease in the afternoon due to smooth atmospheric dispersion, and the daily average concentration is expected to be ‘Moderate.’ In other regions, air quality is expected to be clean due to good atmospheric dispersion and precipitation,” the agency analyzed.
Since PM2.5 concentrations will not be high across all regions, there should be no significant disruption to outdoor activities.
Moderate — Ulsan, Busan (2 locations)
Good — Seoul, Jeju, South Jeolla, North Jeolla, Gwangju, South Gyeongsang, North Gyeongsang, Daegu, South Chungcheong, North Chungcheong, Sejong, Daejeon, Yeongdong, Yeongseo, Southern Gyeonggi, Northern Gyeonggi, Incheon (17 locations)
※ This article was automatically generated by a robot reporter based on air quality forecast data from the Korea Environment Corporation. (Release date: July 18, 2026, 5:00 a.m.)
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