Elevated pollution levels have triggered an air quality advisory for Quesnel.
The environment ministry and Northern Health say high concentrations of fine particulate matter are to blame.
Exposure to fine particulate matter is of particular concern for infants, the elderly and those who have diabetes, and lung or heart disease.
People with chronic underlying medical conditions should postpone strenuous exercise until the advisory is lifted.
Real-time air quality observations and information regarding the health effects of air pollution can be found here.