Wildfire smoke muddled the New York City skyline on Tuesday. Many people experienced the eerie threat mainly by scrolling through social media. But others experienced it in their bodies.

“My eyes were burning,” said UPS package driver Matt Leichenger, who was making deliveries in Brooklyn. “My throat was scratchy. By lunchtime, I was feeling dizzy and nauseous.”

Eventually, he got himself a surgical mask, he said, pausing momentarily to cough while we spoke on the phone. “It got a little bit better, but I was still blowing snot.”

News stories showed a veil of smoke stretching from Wisconsin to Alabama—but UPS didn’t say anything to its workers.