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There were 64,340 reports of natural menopause throughout 1,059,229 person-years of follow-up. In fully adjusted models, a 10 μg/m3 increase in the cumulative average exposure to PM10 (HR 1.02, 95% CI 1.00, 1.04), PM2.5-10 (HR 1.03, 95% CI 1.00, 1.05), and PM2.5 (HR 1.03, 95% CI 1.00, 1.06) and living within 50 m to a major road at age 40 (HR 1.03, 95%CI 1.00, 1.06) were associated with slightly earlier menopause. No statistically significant effect modification was found, although the associations of PM were slightly stronger for women w