The biggest public health threat from smoke is from fine particles, according to Health Officer Hillary Hanson. She adds that the microscopic particles can penetrate deep into your lungs causing a range of health problems.
Those most at risk for health issues are the elderly, children, those with respiratory issues or heart disease.
The air quality in the Flathead was listed as "Moderate" as of early Thursday morning.
Click here to view the latest air quality readings from across Montana.
The recommendations for outdoor activity based on air quality is as follows:
Good: No restrictions.
Moderate: Sensitive people should consider reducing prolonged or heavy exertion.
Unhealthy for Sensitive Groups: People with respiratory or heart disease, the elderly and children should limit prolonged exertion.
Unhealthy: People with respiratory or heart disease, the elderly, and children should avoid any outdoor activity; everyone else should avoid prolonged exertion.
Hazardous: Everyone should avoid any outdoor exertion; people with respiratory or heart disease, the elderly, and children should remain indoors.