Do N95 masks filter pollution from wildfires?

N95 masks protect against dangerous fine particulate matter, including from wildfire smoke, according to federal environmental authorities. 

When worn correctly, certified N95 masks block 95% of airborne particulates from entering the respiratory system. The masks are certified by the National Institute for Occupational Safety and Health, which is responsible for approving respirators for U.S. workplaces. 

N95 masks do not protect against gases or vapors, including formaldehyde, benzene, ethylene oxide and hydrogen sulfide, which have been identified as four of Colorado’s top five industrial air contaminants by the state Air Quality Control Commission.

Short-term exposure to wildfire smoke can lead to difficulty breathing and more serious respiratory and cardiovascular conditions. In July, UC Health doctors in Pueblo reported treating 67 patients for medical issues related to the Aspen Acres wildfire, which burned more than 100,000 acres in southern Colorado.