FIGURE 2—

Global Association Between Air Pollution and Health Stratified by Age, Health Outcome, and Diseases, for (a) Carbon Monoxide, (b) Nitrogen Dioxide, (c) Ozone, (d) PM₁₀, (e) PM_2.5, and (f) Sulphur Dioxide: Studies Published Between 2006 and May 11, 2016

Note. PM₁₀ = fine particulate matter of ≤ 10 µm; PM_2.5 = fine particulate matter of ≤ 2.5 µm. Because most of the studies reported results for more than 1 category of pollutant, health outcome, disease, or age, “n” here represents the number of reports, and not the number of studies. Red circle = hospital admissions; blue circle = mortality; black circle = there is no report; whiskers = 95% confidence interval.