‘The agency said in a statement that it wanted to protect its crews but masks posed too great a risk that firefighters would overheat while doing the strenuous work needed to contain a wildfire. Instead, supervisors are supposed to move them out of heavy smoke and set up sleeping camps in cleaner air when possible.

“Respirators are a potential tool to reduce smoke exposure, but regulatory and logistical challenges make widespread use impractical,” the statement read.

Researchers in countries already using masks told The New York Times that they had not seen an increase in cases of heatstroke. Firefighters will slow down or remove the masks when they get too hot, they said. The Forest Service said it “continues to monitor international practices and research.”

Internal records, studies and interviews with current and former agency officials reveal another motivation: Embracing masks would mean admitting how dangerous wildfire smoke really is.

That could lead to a cascade of expensive changes. The agency, already underfunded and understaffed, might have to add crews to allow for more breaks, or pay for them to sleep in hotels. Recruitment for the grueling, low-paying jobs could become harder. Spending could increase on an extensive range of health issues among workers and veterans.…’ — via New York Times