Air quality advisories were issued Tuesday morning for Prince George and Vanderhoof as the stagnant winter air has led to high concentrations of fine particulate matter.
An advisory was also issued for Vanderhoof and an extreme cold warning also remains in place for most of northern B.C.
People with breathing and cardiovascular troubles are urged to take precautions while recreational fires are prohibited and use of wood-burning appliances is limited to homes where they are the only source of heat.
Industry is required to follow permit requirements that are triggered during air quality advisories and are asked to reduce emissions wherever possible.
Meanwhile, Environment Canada said bitterly cold arctic air will continue to remain entrenched over the area today through Wednesday.
Occasional winds to 15 km/h will give wind chill values down to minus 40, the agency added.
For more information on current air quality, visit www2.gov.bc.ca/gov/content/environment/air-land-water/air.
Visit www.airhealth.ca for information on how to reduce your health risk and your personal contribution to pollution levels, as well as for current and forecast AQHI values.