Since 2000, growing wildfire pollution has reversed significant gains from the Clean Air Act, and over the coming decades, it is poised to become the country’s main source of particulate pollution. In this way, the haunting gray glow of the sky this week was both a throwback to a more contaminated past and a portent of a future clouded more regularly by airborne toxic events such as these.
— David Wallace-Wells: As Canadian smoke darkens the New York sky, the future is clear