Notwithstanding Section 43013.1, the Secretary for Environmental Protection may prohibit the use of methyl tertiary-butyl ether (MTBE) in motor vehicle fuel prior to December 31, 2002, on a subregional basis in the Bay Area Air Basin, or in any other air basin in the state, if the secretary finds and determines all of the following:

1. (a) That the removal of MTBE in motor vehicle fuel on a subregional basis will not cause or contribute to the basin being designated as a state or federal nonattainment area for one or more ambient air quality standards, including, but not limited to, state or federal ambient air standards for ambient ozone and carbon monoxide.
2. (b) That the removal of MTBE in motor vehicle fuel will not increase potency-weighted air toxic compounds, or violate one or more control measures adopted by the state board or a district pursuant to Chapter 3.5 (commencing with Section 39650) of Part 2.
3. (c) That the subregion is a vulnerable groundwater area as defined in Section 25292.4.
4. (d) That the removal of MTBE will not significantly affect the price or supply of gasoline in the subregion.