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Forecasters expect winds to keep pushing wildfire smoke from B.C. and eastern Washington into the county through Thursday.
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.
The fires were among dozens of wildfires across the Western U.S. that stretched the ability of federal, state and local agencies to fight them.
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.
Only sensitive groups are at risk of adverse health effects. The advisory does not currently affect swimming, bathing or handwashing.
Recreational access to parts of Ross Lake are closed due to wildfire activity.
Parks and Recreation staff, volunteers and members of the Washington Conservation Corps began installing native plants in February.