Tehran University of Medical Sciences Journal of Air Pollution and Health 2476-3071 11 3 2026 09 13 463 480 Trisakti Delimasari Health Information Management Study Program, Health Department, Politeknik Negeri Jember, Indonesia Elsa Tursina Health Information Management Study Program, Health Department, Politeknik Negeri Jember, Indonesia Annisa Hikmah Health Information Management Study Program, Health Department, Politeknik Negeri Jember, Indonesia Riska Fatony Health Information Management Study Program, Health Department, Politeknik Negeri Jember, Indonesia 2025 08 08 2026 08 24 The purpose of this review was to examine the relationship between NO2 exposure and the increase likelihood of Diabetes Mellitus (DM) or Type 2 Diabetes (T2D). We conducted the systematic review of cohort studies published between 2015-2025 by carrying out searches in several electronic databases. Nine cohort were included in this meta-analysis. The pooled HR was 1.09 (95% CI = 1.04-1.15) for the impact of NO2 exposure towards the increasing likelihood of DM. In conclusion, the risk of T2D was increasing because the exposure of NO2. https://japh.tums.ac.ir/index.php/japh/article/view/1036 https://japh.tums.ac.ir/index.php/japh/article/download/1036/484