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. 2009 May 26;117(9):1420–1427. doi: 10.1289/ehp.0800430

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Attenuation of average annual FEF_25–75 decline associated with a 10-μg/m³ decrease in average home outdoor PM₁₀ exposure between 1991 and 2002, by genotype status, in all study participants (A) and in never-smokers only (B). A positive value for FEF_25–75 on the y-axes represents the average attenuation in lung function decline associated with an average 10-μg/m³ PM₁₀ decrease during follow-up period. Bonferroni significance level for four comparisons p = 0.013.