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Aims/Introduction  The present meta‐analysis was carried out to assess the association between exposure to the level of atmospheric particulate matter 2.5 ( PM 2.5; fine particulate matter with aerodynamic diameter less than 2.5 μm) and type 2 diabetes mellitus or gestational diabetes mellitus ( GDM ).    Materials and Methods  We searched the Medline,  EMBASE , Cochrane and Web of Science databases to obtain articles according to the responding literature search strategies. Among a total of 279 identified articles, 55 were reviewed in depth, of which 10 articles (11 cohort studies) satisfied the inclusion criteria. Only cohort studies that disclosed the association between  PM 2.5 and type 2 diabetes mellitus or  GDM  were included in this article. A fixed‐effects model was selected if  P  > 0.1 and  I  2  < 50%; otherwise, a random‐effects model would be used to calculate the total effect value. Subgroup analysis was further carried out according to the types of diabetes mellitus (type 2 diabetes mellitus and  GDM ). The relative risk was used to estimate the association between  PM 2.5 and diabetes mellitus.    Results  The positive associations between  PM 2.5 and the incidence of type 2 diabetes mellitus were found in the long‐term exposure period (relative risk 1.25, 95% confidence interval 1.10–1.43), which showed that with every 10‐μg/m 3  increase in  PM 2.5, the risk of type 2 diabetes mellitus would increase by 25% in the long‐term exposure. Although the significant associations were not identified between maternal exposure to  PM 2.5 and  GDM  in the first trimester, the second trimester and the entire pregnancy periods, we could conclude that maternal exposure to  PM 2.5 in the entire pregnancy period would be more likely to lead to developing  GDM  (relative risk 1.162, 95% confidence interval 0.806–1.675) than the other two periods.    Conclusions  Long‐term exposure to  PM 2.5 would be more likely to lead to developing type 2 diabetes mellitus, but more studies would be required to confirm the association between  PM 2.5 and  GDM . It might be a wise to take effective measures to reduce  PM 2.5 exposure in vulnerable populations, especially for pregnant women.

Association between particulate matter 2.5 and diabetes mellitus: A meta‐analysis of cohort studies