Korea Environment Corporation (K-eco) said that a fine dust advisory was issued for Seoul at 9 p.m. on the 20th. Seoul's one-hour average fine dust concentration is 191 ㎍ (micrograms, one-millionth of a gram)/㎥.
A fine dust advisory is issued when the hourly average fine dust concentration of 150 ㎍/㎥ or higher continues for two hours. When the concentration of ultrafine or fine dust in the air rises, older adults, children, and people with respiratory or cardiovascular diseases should refrain from outdoor activities. Healthy adults should also reduce the time spent outdoors and wear a mask when going out.
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