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Smoke is likely coming from ongoing wildfires in BC.
Scattered thunderstorms are forecast to hit the region from late Friday night into Saturday evening.
It comes as Whatcom and Skagit counties remain under an air quality alert through Saturday morning.
Smoke from eastern WA and BC wildfires has led to a reduction in air quality.
The warnings come as the air quality worsened throughout the entire county on Wednesday.
The Border 2 and Luna fires are each burning several thousand acres in the North Cascades while 0% contained.
Gov. Bob Ferguson has declared late last month that August is Emergency Management Awareness Month in Washington state.
Small businesses, private nonprofits and faith-based organizations from Whatcom and Skagit counties are eligible to apply.
The air was unhealthy for sensitive groups in Sumas, Nooksack, Kendall and Maple Falls in the afternoon.
Everson, Kendall and Maple Falls have reached “hazardous” levels.