Air pollution and chronic obstructive pulmonary disease.

Chronic Dis Transl Med · 2020 · PMC7729117 · PMID 33336171

Europe PMC DOI

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a decreasing trendno p-value reported

In addition, there was a decreasing trend in the number of cases of acute exacerbations of COPD advanced due to PM 2.5 exposure. 77 Although air pollution has decreased, air quality has not yet reached the standards set by the WHO.

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Quoted from the open-access full text in Europe PMC under the licence the publisher applied. The sentence is reproduced exactly as published; the emphasis is ours.