Updated 4:50 p.m. Wednesday.
FAIRBANKS - The Fairbanks North Star Borough's air quality advisory for North Pole and Fairbanks has been extended through Friday afternoon.
Air quality in North Pole is classified as “very unhealthy,” exceeding federal health limits for fine particulate pollution.
Extremely cold, still air is behind a strong inversion affecting parts of the Interior. Temperatures tonight are expected to fall to 25 to 40 degrees below zero, although residents in the hills may only see temperatures of minus 15. Highs Thursday are expected to be minus 10 to minus 25, but about zero in the hills.
The cold temperatures are expected to persist through the weekend, according to the National Weather Service.
People with respiratory or heart disease, the elderly and children should avoid any outdoor activity. Others should avoid prolonged exertion.
Fairbanks is is classified as “unhealthy,” and at-risk groups should avoid prolonged exertion. Others should limit prolonged exertion.
For additional information about borough air quality, go online to www.fnsb.us, then select the “air quality” link.