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FOREST RANCH, CALIFORNIA —Wildfires across the western United States and Canada put millions of people under air quality alerts Sunday as thousands of firefighters battled the flames, including the largest wildfire in California this year.
The so-called Park Fire had scorched more than 1,430 square kilometers of land in inland Northern California as of Sunday morning, darkening the sky with smoke and haze and contributing to poor air quality in a large swath of the Northwestern U.S. and western Canada.
Although the sprawling blaze was only 12% contained as of Sunday, cooler temperatures and increased humidity could help crews battle the fire, which has drawn comparisons to the 2018 Camp Fire that tore through the nearby community of Paradise, killing 85 people and torching 11,000 homes. Paradise and several other Butte County communities were under an evacuation warning Sunday.
With the Park Fire, the initial effort by first responders was to save lives and property, but that has has shifted to confronting the fire head-on, Jay Tracy, a spokesperson at the Park Fire headquarters, told The Associated Press by phone Sunday. He said reinforcements would give much-needed rest to local firefighters, some of whom have been working nonstop since the fire started Wednesday.
"This fire is surprising a lot of people with its explosive growth," he said. "It is kind of unparalleled."
Although the area near the Park Fire is expecting cooler-than-average temperatures through the middle of this week, that doesn't mean "that fires that are existing will go away," said Marc Chenard, a meteorologist at the National Weather Service's Weather Prediction Center in College Park, Maryland.
The Park Fire, which started Wednesday when authorities say a man pushed a burning car into a gully in Chico and then fled, has destroyed at least 134 structures, fire officials said. About 3,400 firefighters, aided by numerous helicopters and air tankers, are battling the blaze.
A Chico man accused of setting the fire was arrested Thursday and is due in court Monday.
The Park Fire was one of more than 100 blazes burning in the U.S. on Sunday, according to the National Interagency Fire Center. Some were sparked by the weather, with climate change increasing the frequency of lightning strikes as the Western U.S. endures blistering heat and bone-dry conditions.
Despite the improved fire weather in Northern California, conditions remained ripe for even more blazes to ignite, with the National Weather Service warning of "red flag" conditions on Sunday across wide swaths of Utah, Colorado and Wyoming, in addition to parts of California.
In Southern California, a fire in the Sequoia National Forest swept through the community of Havilah after burning more than 124 square kilometers in less than three days. The town of roughly 250 people had been under an evacuation order.
Fires were also burning across eastern Oregon and eastern Idaho, where officials were assessing damage from a group of blazes referred to as the Gwen Fire, which was estimated at 106 square kilometers in size as of Sunday.