The onslaught of ultra-fine dust, which began the day before yesterday, is expected to continue through the 23rd.
Under the influence of a high-pressure system, stable atmospheric conditions have allowed ultra-fine dust from China to accumulate over several days.
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On the 22nd, according to Air Korea, the fine dust levels across the nation, excluding Jeju, were rated as "bad."
This was due to ultra-fine dust (PM2.5) that flowed in the previous day and became trapped in stagnant air, compounded by another wave of fine dust from China entering during the morning.
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Recently, a high-pressure system has settled over the Korean Peninsula, preventing cold air from the north from descending while warm westerly winds have continued to blow.
As a result, even on January 20th, traditionally the coldest day of the year according to the solar term Daehan, the nation experienced an influx of fine dust riding the westerly winds instead of a cold snap, leading to poor air quality nationwide.
Since then, the Korean Peninsula has remained under the influence of high pressure, causing stagnant air to trap fine dust, preventing it from dispersing.
Air quality is forecasted to remain poor on the 23rd as well.
While Incheon, Gangwon, and Jeju are exceptions, with fine dust levels rated as "normal," other regions are expected to experience "bad" levels due to the lingering accumulation of both imported and domestically generated fine dust.
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