In this week’s episode, host Daniel Raimi talks with Travis Roach, an associate professor and director of the Central Policy Institute at the University of Central Oklahoma, about how the prevalence of air pollution may increase the incidence of fatal traffic accidents in the United States. Roach discusses the characteristics of airborne particulate matter that is 2.5 microns in diameter or less, which is air pollution known as PM2.5; the sources of PM2.5, including coal- and natural gas–fired power plants, vehicle tailpipe emissions, and wildfire smoke; the negative effects of PM2.5 exposure on physical health and cognitive functioning; and policies and technologies that can help reduce public exposure to PM2.5. References and recommendations: “Negative Externalities of Temporary Reductions in Cognition: Evidence from Particulate Matter Pollution and Fatal Car Crashes” by Anne M. Burton and Travis Roach; https://annemburton.com/pages/working_papers/Burton_Roach_Pollution.pdf PurpleAir sensors and maps that measure air-quality data “Prairie Up: An Introduction to Natural Garden Design” by Benjamin Vogt; https://www.press.uillinois.edu/books/?id=p086779