RALEIGH, N.C. — Over the weekend, a haze lingered in the North Carolina air, caused by wildfires in Canada that have forced thousands to evacuate across three provinces.

The smoke has worsened air quality and reduced visibility in Canada and parts of the U.S.

“We should expect at least a couple more rounds of Canadian smoke to come through the U.S. over the next week,” said Bryan Jackson, a meteorologist with the National Weather Service in the U.S.

Windy conditions have carried the smoke as far south as the Gulf Coast.

On Sunday, air quality reached “unhealthy” levels in parts of North Dakota, Montana, Minnesota, and South Dakota, as reported by the EPA’s AirNow page. Officials warn that air quality may deteriorate further nationwide in the coming days.

“Air quality and visibility due to wildfire smoke can fluctuate over short distances and can vary considerably from hour to hour,” Saskatchewan’s Public Safety Agency warned Sunday. “As smoke levels increase, health risks increase.”

The Associated Press contributed to this report.

At least 80 shots were fired in a North Carolina neighborhood, killing one person and injuring 11 others, authorities said Sunday.

The shooting early Sunday took place in Hickory, the Catawba county sheriff’s office said. No arrests have been made, but authorities said there was more than one shooter.

The shooting took place at about 12:45am during a party in Hickory, the Catawba county sheriff’s office said.

One victim was in critical condition and 10 others were hospitalized in serious condition, the sheriff’s office said.

The North Carolina state bureau of investigation and the Hickory police department are investigating the shooting. The FBI is also assisting in the case. No arrests have been made and the total number of shots fired is not yet known.

The sheriff’s department has not released the victims’ names or ages.

Investigators said there were as many as 100 people attending a house party at a home on the street when one or more people discharged firearms, WSOC-TV reported.

Eyewitnesses told local reporters that many people attending the party were from nearby high schools and people began scattering, ducking for cover and running toward safety when shots erupted.

Major Aaron Turk with the sheriff’s office said at a news conference that the street was usually quiet.