(CNN)After a day of poor air quality stretching as far as the East Coast, some people may soon get to breathe a little easier with the help of a new cold front pushing out the smoke created by wildfires in Canada and on the West Coast — but not for long.

By Thursday night, smoke from wildfires could possibly return, and another front will push through the region on Saturday into Sunday to help clean it out again, according to CNN meteorologist Michael Guy. This will be the pattern until the jetstream changes direction and/or the fires have diminished, he said.Wildfires burning out of control across the Western United States are causing hazy skies throughout New York City and Washington, DC, July 20, 2021. Wildfires burning out of control across the Western United States are causing hazy skies throughout New York City and Washington, DC, July 20, 2021. Wildfires burning out of control across the Western United States are causing hazy skies throughout New York City and Washington, DC, July 20, 2021. With 78 large fires burning across 13 states, more than 20,000 wildland firefighters are battling blazes across the country. The fires have collectively scorched at least 1.35 million acres as of Thursday, according to the National Interagency Fire Center (NIFC). Wildfires have erupted across the globe, scorching places that rarely burned beforeWildfires have erupted across the globe, scorching places that rarely burned beforeWildfires have erupted across the globe, scorching places that rarely burned beforeAnd in Canada, a state of emergency was declared for British Columbia, where 3,180 firefighters are working on 300 fires across the province, officials said.Read MoreThe intensity of the fires was so strong that high-level winds had carried their smoke to the East Coast, where New York City recorded its worst air quality day in over a decade. The city saw a 24-hour average Air Quality Index of 154 on Tuesday, the worst it’s been since June 2006, when the AQI was 157.In the West, where extreme drought hasn’t let up for months, the fires have destroyed structures, led to power outages and compelled Oregon officials to deploy the National Guard to fight the nation’s largest wildfire — the Bootleg Fire — that has been burning for nearly 10 days.A hotshot hand crew walks near a wildfire in Topanga, California, on Monday, July 19.A hotshot hand crew walks near a wildfire in Topanga, California, on Monday, July 19. Photos: Wildfires raging in the WestA hotshot hand crew walks near a wildfire in Topanga, California, on Monday, July 19.Hide Caption 1 of 22Nicolas Bey, 11, hugs his father, Sayyid Bey, on July 19, near a donated trailer they are using after their home was burned in the Bootleg Fire near Beatty, Oregon.Nicolas Bey, 11, hugs his father, Sayyid Bey, on July 19, near a donated trailer they are using after their home was burned in the Bootleg Fire near Beatty, Oregon. Photos: Wildfires raging in the WestNicolas Bey, 11, hugs his father, Sayyid Bey, on July 19, near a donated trailer they are using after their home was burned in the Bootleg Fire near Beatty, Oregon.Hide Caption 2 of 22Firefighters extinguish hot spots in an area affected by the Bootleg Fire near Bly, Oregon, on July 19.Firefighters extinguish hot spots in an area affected by the Bootleg Fire near Bly, Oregon, on July 19. Photos: Wildfires raging in the WestFirefighters extinguish hot spots in an area affected by the Bootleg Fire near Bly, Oregon, on July 19.Hide Caption 3 of 22A bear cub clings to a tree after being spotted by a safety officer at the Bootleg Fire in southern Oregon, on Sunday, July 18. A bear cub clings to a tree after being spotted by a safety officer at the Bootleg Fire in southern Oregon, on Sunday, July 18. Photos: Wildfires raging in the WestA bear cub clings to a tree after being spotted by a safety officer at the Bootleg Fire in southern Oregon, on Sunday, July 18. Hide Caption 4 of 22The Tamarack Fire burns in Markleeville, California, near the Nevada border, on Saturday, July 17. The fire was sparked by lightning on July 4 and has triggered mandatory evacuations for a number of campgrounds and neighborhoods in the area.The Tamarack Fire burns in Markleeville, California, near the Nevada border, on Saturday, July 17. The fire was sparked by lightning on July 4 and has triggered mandatory evacuations for a number of campgrounds and neighborhoods in the area. Photos: Wildfires raging in the WestThe Tamarack Fire burns in Markleeville, California, near the Nevada border, on Saturday, July 17. The fire was sparked by lightning on July 4 and has triggered mandatory evacuations for a number of campgrounds and neighborhoods in the area.Hide Caption 5 of 22A member of the Northwest Incident Management Team 12 holds a map of the Chuweah Creek Fire as wildfires devastated Nespelem, Washington, on Friday, July 16.A member of the Northwest Incident Management Team 12 holds a map of the Chuweah Creek Fire as wildfires devastated Nespelem, Washington, on Friday, July 16. Photos: Wildfires raging in the WestA member of the Northwest Incident Management Team 12 holds a map of the Chuweah Creek Fire as wildfires devastated Nespelem, Washington, on Friday, July 16.Hide Caption 6 of 22A cloud from the Bootleg Fire drifts into the air near Bly, Oregon, on July 16.A cloud from the Bootleg Fire drifts into the air near Bly, Oregon, on July 16. Photos: Wildfires raging in the WestA cloud from the Bootleg Fire drifts into the air near Bly, Oregon, on July 16.Hide Caption 7 of 22Firefighters spray water from the Union Pacific Railroad's fire train while battling the Dixie Fire in California's Plumas National Forest on July 16.Firefighters spray water from the Union Pacific Railroad's fire train while battling the Dixie Fire in California's Plumas National Forest on July 16. Photos: Wildfires raging in the WestFirefighters spray water from the Union Pacific Railroad’s fire train while battling the Dixie Fire in California’s Plumas National Forest on July 16.Hide Caption 8 of 22Horses climb a hillside that was burned by the Chuweah Creek Fire in eastern Washington.Horses climb a hillside that was burned by the Chuweah Creek Fire in eastern Washington. Photos: Wildfires raging in the WestHorses climb a hillside that was burned by the Chuweah Creek Fire in eastern Washington.Hide Caption 9 of 22Fire from the Bootleg Fire illuminates smoke near Bly, Oregon, on the night of July 16.Fire from the Bootleg Fire illuminates smoke near Bly, Oregon, on the night of July 16. Photos: Wildfires raging in the WestFire from the Bootleg Fire illuminates smoke near Bly, Oregon, on the night of July 16.Hide Caption 10 of 22A firefighter battles the Bootleg Fire in the Fremont-Winema National Forest, along the Oregon and California border, on Thursday, July 15.A firefighter battles the Bootleg Fire in the Fremont-Winema National Forest, along the Oregon and California border, on Thursday, July 15. Photos: Wildfires raging in the WestA firefighter battles the Bootleg Fire in the Fremont-Winema National Forest, along the Oregon and California border, on Thursday, July 15.Hide Caption 11 of 22A firefighting aircraft drops flame retardant on the Bootleg Fire in Bly, Oregon, on July 15.A firefighting aircraft drops flame retardant on the Bootleg Fire in Bly, Oregon, on July 15. Photos: Wildfires raging in the WestA firefighting aircraft drops flame retardant on the Bootleg Fire in Bly, Oregon, on July 15.Hide Caption 12 of 22Firefighters dig away at hot spots underneath stumps and brush after flames from the Snake River Complex Fire swept through the area south of Lewiston, Idaho, on July 15.Firefighters dig away at hot spots underneath stumps and brush after flames from the Snake River Complex Fire swept through the area south of Lewiston, Idaho, on July 15. Photos: Wildfires raging in the WestFirefighters dig away at hot spots underneath stumps and brush after flames from the Snake River Complex Fire swept through the area south of Lewiston, Idaho, on July 15.Hide Caption 13 of 22Burned cars sit outside a home that was destroyed by the Chuweah Creek Fire in Nespelem, Washington.Burned cars sit outside a home that was destroyed by the Chuweah Creek Fire in Nespelem, Washington. Photos: Wildfires raging in the WestBurned cars sit outside a home that was destroyed by the Chuweah Creek Fire in Nespelem, Washington.Hide Caption 14 of 22Evacuee Dee McCarley hugs her cat Bunny at a Red Cross center in Klamath Falls, Oregon, on Wednesday, July 14.Evacuee Dee McCarley hugs her cat Bunny at a Red Cross center in Klamath Falls, Oregon, on Wednesday, July 14. Photos: Wildfires raging in the WestEvacuee Dee McCarley hugs her cat Bunny at a Red Cross center in Klamath Falls, Oregon, on Wednesday, July 14.Hide Caption 15 of 22An airplane drops fire retardant on the Chuweah Creek Fire in Washington on July 14.An airplane drops fire retardant on the Chuweah Creek Fire in Washington on July 14. Photos: Wildfires raging in the WestAn airplane drops fire retardant on the Chuweah Creek Fire in Washington on July 14.Hide Caption 16 of 22Operations Section Chief Bert Thayer examines a map of the Bootleg Fire in Chiloquin, Oregon, on Tuesday, July 13.Operations Section Chief Bert Thayer examines a map of the Bootleg Fire in Chiloquin, Oregon, on Tuesday, July 13. Photos: Wildfires raging in the WestOperations Section Chief Bert Thayer examines a map of the Bootleg Fire in Chiloquin, Oregon, on Tuesday, July 13.Hide Caption 17 of 22Fire consumes a home as the Sugar Fire, part of the Beckwourth Complex Fire, tears through Doyle, California, on July 10. It's the <a href="https://www.cnn.com/2021/07/14/weather/california-doyle-second-wildfire-in-a-year/index.html" target="_blank">second time in less than a year</a> that the small town has been ravaged by a wildfire.Fire consumes a home as the Sugar Fire, part of the Beckwourth Complex Fire, tears through Doyle, California, on July 10. It's the <a href="https://www.cnn.com/2021/07/14/weather/california-doyle-second-wildfire-in-a-year/index.html" target="_blank">second time in less than a year</a> that the small town has been ravaged by a wildfire. Photos: Wildfires raging in the WestFire consumes a home as the Sugar Fire, part of the Beckwourth Complex Fire, tears through Doyle, California, on July 10. It’s the second time in less than a year that the small town has been ravaged by a wildfire.Hide Caption 18 of 22Men hug a member of the Red Cross at a Bootleg Fire evacuation center in Klamath Falls, Oregon, on July 12.Men hug a member of the Red Cross at a Bootleg Fire evacuation center in Klamath Falls, Oregon, on July 12. Photos: Wildfires raging in the WestMen hug a member of the Red Cross at a Bootleg Fire evacuation center in Klamath Falls, Oregon, on July 12.Hide Caption 19 of 22Embers blow across a field as the Sugar Fire burns in Doyle, California, on July 9.Embers blow across a field as the Sugar Fire burns in Doyle, California, on July 9. Photos: Wildfires raging in the WestEmbers blow across a field as the Sugar Fire burns in Doyle, California, on July 9.Hide Caption 20 of 22Firefighters monitor the Sugar Fire in Doyle, California, on July 9.Firefighters monitor the Sugar Fire in Doyle, California, on July 9. Photos: Wildfires raging in the WestFirefighters monitor the Sugar Fire in Doyle, California, on July 9.Hide Caption 21 of 22In this long-exposure photograph, taken early on July 2, flames surround a drought-stricken Shasta Lake during the Salt Fire in Lakehead, California.In this long-exposure photograph, taken early on July 2, flames surround a drought-stricken Shasta Lake during the Salt Fire in Lakehead, California. Photos: Wildfires raging in the WestIn this long-exposure photograph, taken early on July 2, flames surround a drought-stricken Shasta Lake during the Salt Fire in Lakehead, California.Hide Caption 22 of 22western wildfires 0719 CALIFORNIA01 bootleg fire 071902 bootleg fire 0719western wildfires 0718 OREGON02 western wildfires03 western wildfires04 western wildfires05 western wildfires06 western wildfires07 western wildfires20 western wildfires19 western wildfires08 western wildfires10 western wildfires11 western wildfires09 western wildfires12 western wildfires14 western wildfires15 western wildfires16 western wildfires17 western wildfires18 western wildfiresIn California, where the NIFC says eight active fires have already burned nearly 200,000 acres, additional evacuations were issued Wednesday around the Dixie Fire in Butte County. “Firefighters fought the fire aggressively from the ground and the air. … The fire is burning in a remote area with limited access and steep terrain,” according to a statement from InciWeb, the US clearinghouse for wildfire information.Bootleg Fire remains the largest in the US Meanwhile, America’s largest wildfire got bigger.The Bootleg Fire in southern Oregon swelled by 6% from Tuesday, bringing it to 395,463 acres with a containment of 38%, the fire’s Public Information Officer Sarah Gracey told CNN.And although the fire expanded, Gracey said the small increase seems like progress. “The fire has only grown 2,000 acres in the past two days, this is a small amount which is significant,” she said. “We are turning a corner on this fire, we feel.”She added the “good, safe, and aggressive firefighting on the ground” has been key, but officials are conscious that the fight isn’t over yet. “We do have critical fire weather conditions through the weekend, but we are not anticipating additional Red Flag Warnings. So, while our weather is slightly better for the rest of the week, we do still have critically dry fuels which means the potential for large fire growth remains very high.”Record-breaking, triple-digit temperatures and severe drought have devastated parts of Oregon. Those conditions have been fueling the fire and forcing evacuations. Western wildfire smoke is contributing to New York City's worst air quality in 15 yearsWestern wildfire smoke is contributing to New York City's worst air quality in 15 yearsWestern wildfire smoke is contributing to New York City's worst air quality in 15 yearsCampfires will be banned in all state parks and state-managed forests east of Interstate 5 starting Thursday, the Oregon Parks and Recreation Department said Wednesday. That covers all regions of the state except the Pacific coast and a portion of the Willamette Valley.The ban includes not only charcoal and propane fires, but also tiki torches and even candles.The Statue of Liberty sits behind a cloud of haze on July 20, 2021, in New York City. According the National Oceanic and Atmospheric Administration, wildfire smoke from wildfires has arrived in the tri-state area creating decreased visibility and a yellowish haze in many areas.The Statue of Liberty sits behind a cloud of haze on July 20, 2021, in New York City. According the National Oceanic and Atmospheric Administration, wildfire smoke from wildfires has arrived in the tri-state area creating decreased visibility and a yellowish haze in many areas.The Statue of Liberty sits behind a cloud of haze on July 20, 2021, in New York City. According the National Oceanic and Atmospheric Administration, wildfire smoke from wildfires has arrived in the tri-state area creating decreased visibility and a yellowish haze in many areas.Oregon Gov. Kate Brown has pointed to climate change as the culprit behind the fires, ice storms, record-breaking high temperatures and drought emergencies hitting her state. “There’s absolutely no question that climate change is playing out for before our eyes,” Brown said at a news conference Tuesday. “We saw the heat dome event a few weeks ago; we unfortunately lost a lot of Oregonians through that event. In February, we saw devastating ice storms, over a half a million people lost power last fall, as you are well aware. We’ve had unprecedented wildfires.”Fire potential is being driven by drought conditions, with 90% of Oregon in either exceptional, extreme or severe drought, Doug Grafe, chief of fire protection at the Oregon Department of Forestry, said while predicting a “long, difficult fire season.”He said it’s possible that another 50,000 to 100,000 acres could burn before the Bootleg Fire is contained.”The future for us for the remainder of the season continues to look above normal dry and above normal temperatures,” Grafe said. “So this is not going to return to normal anytime soon.”More fires ravage US lands Elsewhere, Montana currently has 17 wildfires — the most in the country — that have charred more than 100,000 acres, and Idaho is seeing 16 active wildfires that burned 175,000 acres, according to NIFC. Following Oregon, the states with the most acres burned are California, Idaho and then Alaska. PG&E announces it will bury 10,000 miles of power lines to help reduce wildfire riskPG&E announces it will bury 10,000 miles of power lines to help reduce wildfire riskPG&E announces it will bury 10,000 miles of power lines to help reduce wildfire riskThe Dixie Fire in California’s Butte County has scorched more than 90,000 acres since it began last week and remained contained at 15% Wednesday. Evacuations have been ordered in the area, and the fire already destroyed two structures and threatens more than 800 others.On Tuesday, Pacific Gas and Electric said the fire may have been sparked by equipment it manages.In a preliminary filing with the California Public Utilities Commission, PG&E detailed an outage alert July 13, the same day the fire started. A responding utility worker found three blown fuses and a tree leaning into a pole, with a small fire on the ground near the base of the tree.Butte County is the site of California’s deadliest and most destructive wildfire in 2018, the Camp Fire. It destroyed 18,804 structures and killed 85 people.

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https://www.cnn.com/2021/07/22/weather/us-western-wildfires-thursday/index.html

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