A gray haze from wildfire smoke could be seen in Cincinnati, and the entire state of Minnesota is under an air quality alert.

An air quality map shows conditions across the United States on Wednesday as Canadian wildfire smoke is forecast to continue to spread across the country, prompting air quality alerts and advisories in multiple states.

Prolonged exposure to wildfire smoke can have short- and long-term impacts on one's health, especially for those with chronic conditions, seniors, young children and pregnant women.