The Puget Sound Clean Air Agency imposed a stricter Stage 2 burn ban for Snohomish County effective at noon Sunday because of worsening air quality.

During a Stage 2 ban, nobody is allowed to use any wood-burning fireplace, wood stove or fireplace insert, even if they are certified models. Even people with who lack another source of adequate heat cannot generate visible smoke. All outdoor burning is prohibited, including wood- and charcoal-fueled recreational fires.

A Stage 1 ban had been in effect since Friday because of clear, stagnant air and low wind speeds.

The National Weather Service predicted dry, cold conditions in the Everett area through Tuesday night, when clouds were expected to move in. Rain is possible later in the week.

To receive an update on the ban status, call this toll-free hotline: 800-552-3565. A new smartphone app called “Burn Ban 411” also can give people the latest status and can be downloaded at tinyurl.com/poaqwjz.