In photos: Firefighters battle 75 large blazes across West on first day of fall

Firefighters battling the Bobcat Fire near Cedar Springs in the Angeles National Forest on Sept. 21 in Los Angeles, California. The blaze is the third-largest recorded in the county. Photo: Frederic J. Brown/AFP via Getty Images
Los Angeles County Fire Department firefighters worked into the night to tackle the massive BobCat Fire before the expected arrival of warmer and drier weather later in the week. The blaze has burned over 112,000 acres and was 17% contained late Tuesday.
The big picture: 75 large wildfires were burning in the U.S. Tuesday, the first day of fall, as cooler weather provided relief to firefighters and improved air quality across the West. The mega-fires have killed at least 36 people and charred more than 5 million acres in Oregon, Washington and California — where 26 people have died, over 7,1000 structures have been destroyed and more than 3.6 million acres have been razed.
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Go deeper: Portland has world's worst air quality as West Coast fires raze 5M acres
Editor's note: This article has been updated with more details and images from the fires.