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 ...

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 ...

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 ...