Impact of North Atlantic-East Asian teleconnections on extremely high January PM cases in Korea.

In this study, we investigated the daily variability of PM concentrations in January in Korea during the past 19 years (2001-2019), as well as the associated atmospheric circulation patterns. The daily PM concentrations were classified into three cases: low (L; < 50 μg/m), high (H; 50-100 μg/m), and extremely high (EH; ≥ 100 μg/m). We found that the strength of the East Asian winter monsoon influenced the PM variability in the L and H cases.