Wildfires like the ones currently burning in Los Angeles occur in what's known as the wildland-urban ... they create more toxic smoke and ash," Wexler said. Wear a mask in smoky or ashy conditions ...

Wildfires like the ones currently burning in Los Angeles occur in what’s known as the wildland-urban interface ... they create more toxic smoke and ash,” Wexler said. Children ages 2 years and older ...

The masks with oxygen tanks ... All these chemicals we don’t think of occurring in a wildland fire are now part of the smoke,” said Mary Johnson, principal research assistant at the Harvard ...