71 An additional analysis of this cohort demonstrated a nonsignificant trend toward greater FEV 1 value decline in former smokers exposed to elevated indoor NO 2 levels. 52 With respect to the effects of NO 2 exposure on asthma development, Chen et al performed a meta-analysis of all population-based or original or review articles on epidemiologic studies of the health effects of air pollutants that were published between 1980 and 2019.
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