Wildfire Masking Is Just Different

Late last night, New Yorkers were served a public-health recommendation with a huge helping of déjà vu: “If you are an older adult or have heart or breathing problems and need to be outside,” city officials said in a statement, “wear a high-quality mask (e.g. N95 or KN95).”

It was, in one sense, very familiar advice—and also very much not. This time, the threat isn’t viral, or infectious at all. Instead, masks are being urged as a precaution against the thick, choking plumes of smoke from Canada, where wildfires have been igniting for weeks. The latest swaths of the United States to come into the crosshairs are the Midwest, Ohio Valley, Northeast, and Mid-Atlantic.

The situation is, in a word, bad. Yesterday, New Haven, Connecticut, logged its ; in parts of New York and Pennsylvania, have beento go outdoors,” says Linsey Marr, an environmental engineer at Virginia Tech, “I’d strongly recommend wearing a mask.”