Gao N, et al. - From January 2013 to February 2017, a total of 73,067 individuals were estimated to analyze the impacts of air pollutants on chronic obstructive pulmonary disease (COPD) admissions in Beijing, China. Researchers calculated the highest cumulative lag effect (with per 10 µg/m³ increment in air pollutant levels) for nitrogen dioxide (NO₂) with 3.03% at lag 06, for sulfur dioxide (SO₂) with 2.07% at lag 01, for particulate matter ≤10 µm in aerodynamic diameter (PM₁₀) with 0.92% at lag 07, and for particulate matter ≤2.5 µm in aerodynamic diameter (PM_2.5) with 0.82% at lag 06, respectively. They also noted an increment of 5.99% in carbon monoxide (CO) for each 1 mg/m³ increase at lag 06. They found stronger effects on COPD admissions in warm seasons as compared to cold seasons.