Please note that the CA emissions rules have not changed in the past few months as fuel prices increased by 50% nationwide. Oil companies have disproportionately increases prices on consumers and therefore achieved windfall profits with no government pushback. All that is 100% attributable to Trump.
CA does have stricter fuel and emissions standards than most of the country. It has been the primary driver of cleaner burning cars in the US. I remember the stench and lung burn of cars when I first started running. It is a now thing of the past. Thanks California!