New York City’s air pollution is among the world’s worst—and similar crises are becoming more common. Here's how to be prepared for the next one

Smoke from Canadian wildfires traveled across the border to the east coast Tuesday evening, engulfing the sky in an eerie, yellowish haze. Even with the fires hundreds of miles away, east coast residents reported smelling the smoke.

“It's so intense that it stings your eyes,” one tweet read Tuesday about what it was like in New York City.