Ambient Air Pollution and NeurodegenerativeDiseases: EpidemiologyWhile it remains early in the field, several studies have begun toassess the role of ambient air pollution on neurodegenerativediseases, such as Alzheimer’s disease (AD), Parkinson’s disease(PD), amyotrophic lateral sclerosis (ALS), and multiple sclerosis(MS) (Table 1). At present, treatment is unable to modify disease