Heat and smoke choke Northern Rockies as fire danger spikes

Smoke obscures the air and dims the sun over a hillside burned by a recent wildfire, in Missoula, Mont., on Sunday, July 18, 2021. Extreme heat descended on parts of the U.S. northern Rocky Mountains on Monday, July 19 as authorities struggled to contain dozens of wildfires burning in a region parched by prolonged drought and blanketed with dangerous smoke. (AP Photo/Matthew Brown)