The Puget Sound Clean Air Agency elevated a Stage 1 burn ban in Pierce County to a Stage 2 ban, which restricts all wood-burning in fireplaces, certified or uncertified wood stoves and outdoors.
A Stage 1 burn ban is still in effect in Snohomish County. That ban is similar except wood-burning is allowed in certified wood-burning stoves. A burn ban issued to King County earlier this week was lifted on Wednesday.
Stagnant air and an increase of wood-burning fires in the face of freezing temperatures have increased fine particulate pollution in the air and made the bans necessary, according to the agency.