After Coutts got home from Fort McMurray, he was coughing and wheezing again and couldn't run up the stairs, he says. Firefighters "would have been out there for long periods of time sucking in the smoke," says Fort McMurray fire Chief Darby Allen. Coutts and 13 Slave Lake firefighters helped during the initial days of the Fort McMurray fire and he says he didn't get a filter mask. And the half-masks can cause safety glasses and visors to fog, says Jamie Coutts, fire chief of Slave Lake, Alta. The Fort McMurray fire was unusually large, Krich points out.

Source: CBC News July 11, 2016 13:18 UTC