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Southern wildfires — many of them suspected cases of arson — are spewing smoke so thick that residents are being urged to wear special masks if they must go outdoors.
Many of the nation's largest active wildfires have been burning in the southern Appalachian mountains, where a relentless drought has turned pine trees into torches and forced evacuations in dozens of communities.
More than 5,000 firefighters and support staff from around the nation have poured into the Southeast to try to suppress these fires, the U.S. Forest Service says.
The effort includes about 40 aircraft, including three large air tankers flying out of Chattanooga, Tennessee. Tens of thousands of acres of forest have burned, and about a dozen of the largest fires remain uncontained, the forest service said.
High winds and temperatures and weeks without rain have combined to spark blaze after blaze in the unusually dry landscape. Numerous teams reported wind-driven fires racing up slopes and down ravines as they struggled to protect hundreds of threatened structures.
"It just smells like a campfire" along the Appalachian Trail in north Georgia, said Carlie Gentry, who works at the Mountain Crossings store at Walasi-yi, a popular stop for hikers.
"For weeks up here, we've been having smoke, but it is getting more intense for sure," Gentry said. Typically, the view stretches for miles, she said. Now, "you can hardly see to the next ridge."
Last week's national drought report showed 41.6 million people in parts of 15 Southern states living in drought conditions. The worst conditions are in Georgia, Alabama, Mississippi and Tennessee, but extreme drought also is spreading into the western Carolinas. Kentucky, Tennessee and North Carolina all have fierce fires.
"Right now, we're kind of holding our own," said Jennifer Turner, a spokeswoman for the Kentucky's state Division of Forestry. "We've been able to get control over some of the smaller fires."
Kentucky authorities made two arson arrests and cited another man for causing a brush fire by defying a burn ban. Tennessee authorities also reported arrests for arson and burning violations.
One of the largest blazes was spreading rapidly in the Cohutta Wilderness area just south of the Georgia-Tennessee line. Nearly 300 people are battling that fire, which has already consumed 10,000 acres, the Forest Service said.
In the hills outside Chattanooga, firefighters were trying to save homes on both Signal Mountain and Mowbray Mountain. They may get reinforcements: The Federal Emergency Management Agency said it would reimburse most of one fire's costs after a request from Tennessee.