Red flag warnings remain in place for parts of Nevada, Utah, Colorado and Wyoming due to very dry conditions, low humidity and gusty winds.

Air quality alerts are issued when pollution levels rise to unhealthy levels, warning the public, especially vulnerable groups, to limit outdoor exposure for health and safety.

Millions of people across the Upper Midwest and the Northeast are under air quality alerts Monday, as smoke from wildfires in Canada drift over the region

The return of wildfire smoke from fires burning in Canada has sparked another air quality alert in Minnesota, which will be in effect through Tuesday. The Minnesota Pollution Control Agency has placed the northern two-thirds of the state in the red alert zone, which means "unhealthy" for all residents, through 9 a.m. Tuesday.

Air quality specialists in the state are starting to more closely monitor wildfire activity in Canada. Because of climate change, those fires are becoming more intense and reaching areas closer to the Northeast,

After an air quality alert expires Tuesday afternoon, the Twin Cities will be in for a nice couple of days. The alert was originally set to expire at 9 a.m. but instead was extended by the Pollution Control Agency to 4 p.

An air quality alert was reported by the National Weather Service on Tuesday at 12:17 p.m. in effect until 8 p.m. for Clackamas and Multnomah counties.

The current air quality alert for parts of southern Minnesota has been extended until Tuesday afternoon. The alert is now in effect until 4 p.m. on Tuesday, Aug. 12, for southeast Minnesota and until 11 p.