Section 468A.420 - Oxygenated motor vehicle fuels; when required by rule(1) The Environmental Quality Commission shall adopt rules consistent with section 211 of the Clean Air Act to require oxygenated motor vehicle fuels to be used in any carbon monoxide nonattainment area in the state.(2) The rules adopted under subsection (1) of this section shall require: (a) Oxygenated fuels to be used during any portion of the year during which the nonattainment area is prone to high ambient concentrations of carbon monoxide.(b) The use of oxygenated fuels in carbon monoxide nonattainment areas on or before November 1, 1992.(3) An oxygenated fuel shall contain 2.7 percent or more oxygen by weight. Methods to achieve this requirement may include but need not be limited to the use of ethanol blends.