[roflwaffle]

Originally Posted by diesel_john

I think Calyfornya was in the '60's and the fed clean air that started EPA was in '70. you could be right cause they had positive crankcase ventilation before that.

It looks like it's CA in 57 and 50-state in 67.

State and Federal Standards for Mobile-Source Emissions its pollution problems and pioneering efforts in regulating vehicle emissions. Congress concluded that “although the situation may change, in the 15 years that auto emission standards have been debated and discussed, only the State of California has demonstrated compelling and extraordinary circumstances sufficiently different from the Nation as a whole to justify standards on automobile emissions which may, from time to time, need to be more stringent than national standards” (S. Rep. No. 403, 90th Cong., 1st Sess. 33 [1967]). Moreover, California had begun regulating emissions from motor vehicles in 1957, almost a decade before the federal government began developing a national program. House of Representative John E. Moss stated that continuation of those “pioneering” efforts “offer a unique laboratory, with all the resources necessary, to develop effective control devices which can become a part of the resources of this Nation …” (113 Cong. Rec. 30975 [1967]). The legislation eventually adopted by Congress in 1967 included a compromise provision that directed the secretary of HEW to waive the preemption of state standards, provided the conditions specified in section 209(b) of the statute are met (discussed below), for “any State which has adopted standards (other than crankcase emission standards) for the control of emissions from new motor vehicles or new motor vehicle engines prior to March 30, 1966” (Pub. L. No. 90-148, § 208(b), 81 Stat. 501).