SEOUL, November 25 (AJP) - An ultra-fine dust advisory has been issued for the Seoul metropolitan area overnight, the Seoul Research Institute of Public Health and Environment said on Tuesday.
Such advisories are issued when the hourly average concentration of PM2.5 exceeds 75 µg/m³ for more than two consecutive hours. PM 2.5, which is about 1/30th the size of a human hair, can pass through the filters of the human respiratory system, causing greater harm to the body than regular fine dust.
The institute said a high density of fine dust was caused by accumulated pollutants from outside and inside the country, combined with stagnant air conditions.
The institute said, "Vulnerable people such as the elderly, children, and those with respiratory diseases are advised to refrain from outdoor activities. Those going outside should wear masks and avoid areas with heavy traffic."
* This article, published by Aju Business Daily, was translated by AI and edited by AJP.
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