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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.

California
Firefighters near Wrightwood tackle the Bobcat Fire on Sept. 20. Photo by David McNew/Getty Images
Homes destroyed by the mostly contained Hennessey Fire in Napa, California, on Sept. 15. The fire has burned over 315,000 acres, razed 633 structures and killed five people. Photo: Justin Sullivan/Getty Images
A firefighter surveys the burned remains of Berry Creek School in California on Sept. 14. Photo: Josh Edelson/AFP/Getty Images
Cars drive along the Golden Gate Bridge under an orange smoke filled sky at midday in San Francisco, on Sept. 9, when air quality was among the worst in the world. Photo: Harold Postic/AFP via Getty Images
A tweet previously embedded here has been deleted or was tweeted from an account that has been suspended or deleted.
Oregon
A tweet previously embedded here has been deleted or was tweeted from an account that has been suspended or deleted.
A 12-year-old girl gets a free haircut from a hairdresser at the evacuation center at the Jackson County Fairgrounds in Central Point on Sept. 16. Photo: Paula Bronstein/AFP via Getty Images
Downtown Portland, Oregon, on Sept. 14. Air quality had improved significantly by Sept. 18. Photo: Robyn Beck /AFP/Getty Images Photo: Robyn Beck/AFP via Getty Images
Homeowners survey their property in a neighborhood destroyed by wildfire on in Talent on Sept. 13. Photo: David Ryder/Getty Images
A woman drops off donations for residents evacuated from the Riverside Fire at the Clackamas County Fairgrounds in Canby Sept. 13. Photo: Robyn Bec/AFP via Getty Images
Washington
A seagull flies past cranes on Harbor Island as smoke from wildfires fills the air on Sept. 12 in Seattle. "Most of the wildfire smoke has left western WA," the PS Clean Air Agency tweeted Sept. 19. "Air quality throughout the Puget Sound has reached GOOD. We expect GOOD air quality for the rest of the weekend and well into next week." Photo: Lindsey Wasson/Getty Images
Smoke from wildfires obscure the Space Needle and the Seattle skyline on Sept. 12 in Seattle. Photo: Lindsey Wasson/Getty Images
A tweet previously embedded here has been deleted or was tweeted from an account that has been suspended or deleted.
Montana
A Flathead crew member "digging line around a spot fire on the Callahan Fire," according to the U.S. Forest Service on Sept. 18. Photo: Flathead Hotshots/U.S. Forest Service/FacebooK
Idaho
Part of Highway 21 between Grandjean and 10 miles outside of Stanley, is closed due to a wildfire in Salmon-Challis National Forest. Photo: U.S. Forest Service/Facebook
The Trap Fire was reported on the Sawtooth National Forest on Sept. 14 and is "burning on both sides of Highway 21," the U.S. Forest Service notes. Photo: U.S. Forest Service/Facebook

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.

Go deeper

In photos: First coronavirus vaccines administered in the U.S.

The first doses of Pfizer's long-awaited coronavirus vaccine were distributed in the U.S. on Monday.

The state of play: Vaccines will first go to frontline health care workers followed by older and vulnerable populations. The distribution of Pfizer vaccine marks the beginning of a possible end of the coronavirus pandemic, and may soon be followed by a rollout of vaccines from Moderna and AstraZeneca.

Bryan Walsh, author of Future
Sep 9, 2020 - Health

No more pandemic blue skies

Smoggy air above the San Francisco Bay area on Aug. 22, 2020. Photo: Jose Carlos Fajardo/MediaNews Group/The Mercury News via Getty Images

After months of cleaner air because of lockdowns, air pollution in many major cities has nearly returned to pre-pandemic levels — and in a few cases, exceeded it.

Why it matters: Smoggy skies are a major, if under-recognized, danger to human health and a substantial drag on the economy. If the lockdowns demonstrated what city life could be like with cleaner air, the fact that pollution has rebounded before the global economy has, underscores how difficult it is to stop.

FBI, Homeland Security warn of increasing threat to Capitol

Photo: Eric Baradat/AFP via Getty Images

The FBI and Department of Homeland Security predict violent domestic extremists attacks will increase in 2021, according to a report reviewed by Axios.

Driving the news: The joint report says an unidentified group of extremists discussed plans to take control of the Capitol and "remove Democratic lawmakers" on or about March 4. The House canceled its plans for Thursday votes as word of the possible threats spread.