Air pollution was significantly associated with an increased risk of hospital admissions for several neurological disorders, including Parkinson’s disease, Alzheimer’s disease, and other dementias, in a long-term study of more than 63 million older U.S. adults. The research was conducted by Harvard T.H. Chan School of Public Health, and colleagues at Columbia University Mailman School of Public Health, and Emory University’s Rollins School of Public Health.