Reader Response: Fine Particulate Matter and Parkinson Disease Risk Among Medicare Beneficiaries

We read with great interest the recent article by Krzyzanowski et al.,(1) "Fine Particulate Matter and Parkinson Disease Risk Among Medicare Beneficiaries," in which they highlight a key association between environmental exposures and neurologic health outcomes. Using population-based US Medicare data, they identified a positive, region-specific association between exposure to particulate matter <2.5 micrometers (PM2.5) and risk of Parkinson disease (PD). These findings join a growing body of evidence establishing a link between environmental exposures and PD risk.(2)