The North Dakota Health Department is urging residents to avoid inhaling smoke in areas where there are wildfires.
Health officials say smoke from grass fires can irritate the respiratory system and is especially hazardous for people who suffer from conditions such as asthma and allergies.
The department says people also should stay away from wildfires to protect themselves and also avoid getting in the way of fire crews.
The National Weather Service says dangerous fire weather is in store for much of the Northern Plains over the next several days, with gusty winds and low humidity levels.
A statewide fire emergency is in effect until the end of the month.