Oregon · Oregon Revised Statutes — Oregon Vehicle Code (Ch. 806–815)
ORS (Vehicle Code) § 815.200: if the vehicle is required to comply with one of the following standards for visible emissions and the vehicle produces visible emissions that exceed those allowable under the described standard, as follows: (1) A vehicle exceeds Visible Emission Standard I if the vehicle produces any visible emissi
What this law says, in plain English
Vehicles must not produce visible emissions exceeding allowable standards. At elevations ≤3,000 feet, emissions cannot obscure more than 10% of light (40% allowed for ≤7 seconds). Above 3,000 feet, emissions cannot obscure more than 20% of light (60% allowed for ≤7 seconds).
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