Su SY, Liaw YP, Jhuang JR, et al. - Via performing an ecological study of geographical variation, researchers assessed cancer incidence in Taiwan (from 2012 to 2016) in correlation with air pollution (particularly, particulate matter < 2.5 μm in aerodynamic diameter [PM_2.5], particulate matter < 10 μm in aerodynamic diameter, sulfur dioxide, nitrogen dioxide, nitric oxide, and ozone). By stratifying sexes and urbanization degrees of the local administrative areas, they computed Spearman rank correlation coefficients between the age-adjusted cancer incidence rates and many air pollutants. For every 1 μg/m³ increase in PM_2.5 concentrations, a rise of 13.1, 11, 16.7, and 11.9 per 100,000 populations was noted in the age-adjusted cancer incidence rates for men in developing towns, general towns, and aged towns and for women in aged towns, respectively. Findings revealed a significantly positive correlation between the PM_2.5 concentration and cancer incidence rate following multiple testing correction.