Jo S, Kim YJ, Park KW, et al. - Researchers utilized data from the Korean National Health Insurance Service in this retrospective cohort study to determine the potential link between exposure to particulate matters (PM _2.5 and PM ₁₀ ), nitrogen dioxide (NO ₂ ), ozone (O ₃ ), sulfur dioxide (SO ₂ ), and carbon monoxide (CO) and the risk of incident Parkinson disease (PD). This cohort analysis involved a nationally representative cohort from a metropolitan city in South Korea (n = 78,830). An elevation in PD risk was observed in relation to exposure to NO ₂ . There were no statistically significant links between exposure to PM _2.5 , PM ₁₀ , O ₃ , SO ₂ , or CO and PD incidence. Findings of this large cohort study revealed that NO ₂ exposure was statistically significantly associated with the risk of PD. This revelation indicates that air pollutants have a role in PD development, advocating for the necessity to execute a targeted public health policy.