Just Ask the Dinosaurs How Bad Air Quality Can Get

The air quality this week is bad. Smoke from Canadian wildfires has turned the sky orange in Philadelphia. It has veiled the Statue of Liberty in Manhattan. In Detroit, which has dealt with some of the worst conditions in the country, the smoke has almost entirely blurred the city’s skyline. The eastern United States isn’t exactly accustomed to smoke days, which can prompt someone like me, from the wildfire-prone West, to brag about how they’ve seen far worse. But those smoke days are nothing…