Woodstove owners in the Eugene-Springfield area have been pouring on the fuel during a cold snap, and air-quality regulators say a buildup of pollution means the burning has to be curbed.
A ban on visible chimney smoke could last through Sunday, when warmer weather is expected.
The Eugene Register-Guard reports such bans may become more frequent because federal standards on particulate pollution have been tightened.
The Lane Regional Air Protection Agency imposed a ban in the mountain town Oakridge on Wednesday.
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