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The air was unhealthy for sensitive groups in Sumas, Nooksack, Kendall and Maple Falls in the afternoon.
Dry conditions and elevated fire risks led to the ban, which includes recreational fires and fire pits.
Protect Mud Bay Cliffs filed the appeal in June after an Environmental Impact Statement for the new residential area was denied.
Residents are being reminded to avoid contact with bats as encounters rise during summer.
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.
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.