Results for long-term O 3 indicate positive associations, however, only marginal significance is achieved in study period 1.
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Independent associations of short- and long-term air pollution exposure with COVID-19 mortality among Californians.
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The sentences
Statistically significant effects were seen for long-term exposure to PM 2.5 and NO 2 in both study periods; O 3 effects were marginally significant in study period 1 and statistically significant in study period 2.