Smoke from wildfires in Canada that pushed deep into the United States this week has reached new areas within the South, together with in North Carolina and Georgia, that had principally escaped the poisonous drift blowing in from the fires in June, officers stated.

“Horrific up here!” Merry Miller Weis, a 70-year-old resident within the Western North Carolina mountains, wrote in an e-mail to state local weather scientists. “The mountains aren’t even visible. This is the absolute worst since the beginning of the Canadian fires.”

In June, heavy smoke from fires within the Canadian province of Quebec wafted towards the East Coast, enveloped components of New York and moved via different states, previous Washington, D.C., and as far west as Minnesota. This month, the huge plume has wafted in from fires in Canada’s Northwest, smothering the skies and elevating warnings concerning the impression on well being.

Corey Davis, an assistant state climatologist in North Carolina, stated in an interview on Tuesday that his workplace had obtained the unsolicited e-mail from Jackson County, part of the state that was new territory for smoke attributed to the Canadian wildfires to linger. In June, it appeared principally within the north-central city area generally known as the Triad.

“It is now more concentrated in the West,” Mr. Davis stated. “We have a high pressure system parked over the western part of the state. It’s like putting a lid on a pot of boiling water. Smoke mainly from the western Canadian wildfires is basically trapped right at the ground level.”

Around 8 a.m. on Tuesday, greater than 44 million individuals in 28 states and Washington, D.C. continued to be affected by smoke from the fires, and plenty of states within the South are under heat advisories, together with components of Georgia and Tennessee.

In Greensboro, a studying of the air high quality index was within the vary of 152 early on Tuesday, and in Atlanta, the index measured 150 by midday, each unhealthy ranges.

Mr. Davis, describing the sky in Raleigh as a “pale orange, completely blank canvas,” stated the state’s Western area “may be a little bit worse than what we had last month.” He stated the state was at “Code Orange” — which means an unhealthy air high quality for delicate teams — for 4 days final month, “the most in 11 years.”

In Georgia, smoke infiltrated the sky over extra communities in Atlanta and alongside the border with Tennessee, and for the primary time in Athens, stated Jim Boylan, the chief of the air safety department at Georgia’s Environmental Protection Division.

That information was primarily based on readings of particulate matter from seven displays: 5 round Atlanta, one in Rossville and one in Athens, he stated. All have been Code Orange on the air high quality index, which implies unhealthy for delicate teams. In June, 4 displays picked up these readings.

“This time we have more locations than last time,” he stated.

Several components propelled the smoke towards the South, stated Bill Murphey, the state climatologist in Georgia. Winds helped to funnel it farther into the South, in contrast with earlier smoke intrusions, he stated.

“This push of smoke is a little bit higher up in the atmosphere, kind of vertically stacked, than the previous one,” he stated. There was additionally the next focus of particle air pollution, he stated.

In South Carolina, sensors have picked up larger concentrations of particulate matter than seen beforehand, stated Andrew Kingston, the lead meteorologist for the state bureau of air high quality. A latest lack of wind circulate east of the Appalachians has meant the smoke “just sits there and doesn’t disperse,” he stated.

“The weather pattern is perfect for sending it further south,” he stated. “The last time it kind of touched us. But this time it is aimed directly at us.”

Over the previous few days, authorities officers in a number of states have suggested residents to curtail their out of doors exercise and, in some circumstances, to put on a masks.

Ms. Weis, who wrote the e-mail to the North Carolina local weather workplace, stated she wore one on a visit to the submit workplace on Monday, however she stated her “eyes and throat feel as if they’re on fire.”

Reached by phone, she stated the smoke had settled beneath the tree line within the mountains the place she lives within the area of Cullowhee, obscuring her view of the Blue Ridge Mountains and Mount Pisgah, about 40 miles away because the crow flies.

“Usually, it is a spectacular view,” she stated. “But they have just disappeared.”