To the Editor Mr Di and colleagues1 found that short-term exposures to ambient fine particulate matter (PM2.5) and ozone were associated with increased mortality in older adults using statistical analyses of a large database. However, they used incomplete exposure data and an inappropriate outcome measure, and they neglected regional variability.
Lipfert FW. Air Pollution and Mortality in the Medicare Population. JAMA. 2018;319(20):2133–2134. doi:10.1001/jama.2018.3939
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