Air quality alerts have been issued across several states, including Minnesota, Michigan, and areas in the Northeast, as smoke from raging wildfires in Canada and Minnesota drifts into the US. The smoke is expected to create hazardous conditions, with hazy skies and dangerously poor air quality affecting millions. Residents are urged to prepare for a combination of extreme heat and humidity along with thick smoke, leading to a double threat of health risks. The return of wildfire smoke has revived memories of previous years, prompting officials to issue multiple weather alerts and warnings for adverse air quality conditions throughout the week.