Figure 1. Meta‐analysis of the relative risk of ischemic heart disease mortality per 10‐µg/m³ increase in long‐term fine particulate matter <2.5 µm in diameter exposure, combining the effects of 23 studies. ¹¹ .

AHS indicates Agricultural Health Study; AHSMOG, Adventist Health Study on the Health Effects of Smog; CanCHEC, Canadian Census Health and Environment Cohort; CNBSS, Canadian National Breast Screening Study; CPRD, Clinical Practice Research Datalink; CPS‐II, American Cancer Society Cancer Prevention Study‐II; EFFECT, Enhanced Feedback For Effective Cardiac Treatment; ESCAPE, European Study of Cohorts for Air Pollution Effects; HR, hazard ratio; NHIS, National Health Interview Survey; NIH‐AARP, National Institutes of Health—AARP Diet and Health Study; REGARDS, Reasons for Geographic and Racial Differences in Stroke; RoLS, Rome Longitudinal Study; and WHI, Women's Health Initiative.