This legislation has been repealed.
(1) This clause applies to motor vehicles propelled by a spark-ignition or diesel engine.
(2) For the purposes of section 154(2)(a) of the Act, a motor vehicle emits excessive air impurities if, when in operation, it emits air impurities in excess of such a standard of concentration that air impurities are visible for a continuous period of more than 10 seconds when determined in accordance with TM-31.
(3) For the purposes of section 154(2)(b) of the Act, a motor vehicle emits excessive air impurities if, when tested in accordance with TM-31, it emits air impurities in excess of an amount per test that results in air impurities being visible for a continuous period of more than 10 seconds.