Cold weather, a temperature inversion and stagnant air have combined to trap the particles from burning wood and fuel exhaust.
The county was out of compliance with federal standards on Wednesday for a second time, and projections for Saturday would bring make for a third time.
That would mean the region hasn't met its goals, leading to tighter 2014 restrictions, including a ban on open fireplaces and further regulation of industry.
A county commissioner says he'll seek an exception on the grounds the recent conditions are an extreme weather event.
Copyright 2013 The Associated Press. All rights reserved. This material may not be published, broadcast, rewritten or redistributed.
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