The colors are used on air quality forecast maps. No city had a worse sustained reading in 2021 than Salem, Ore., where the index almost reached ... and older adults. Image Ash-covered foliage ...

A hazardous cloud of toxic air has engulfed a major US city, reportedly causing an emergency alert for toxic chemicals, with ...

Image A little before 1 p.m., Apple’s weather app showed the Air Quality Index at a very hazardous ... so I’m like, No thanks, I’m just staying inside,” Ms. Blair said.