Everson, Kendall and Maple Falls have reached “hazardous” levels.
Forecasters expect winds to keep pushing wildfire smoke from B.C. and eastern Washington into the county through Thursday.
Between a block party and sand sculpture competition, Whatcom County was rife with activity the first weekend of August.
“It’s cheaper to call a pest control company than it is to call 911.”
The statewide ban does not supersede Whatcom County’s current Stage 2 burn ban.
The state’s largest wildfire has burned well over 100,000 acres so far.
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Breathing in ozone can cause a range of health problems, especially for children, older adults and people with respiratory conditions.
High temperatures and strong winds could make existing wildfires spread unpredictably.
Fire officials say dry conditions and shifting winds are likely to drive further fire growth.