I remember the days of the two-tiered emission standards for cars and light trucks. I looked it up, and John is right that it was in the mid-to-late '90s and early 2000s -- the same time that families switched from minivans to SUVs. It was over before Obama took office. Big (ego boost) trucks, however, still have a loophole. https://www.epa.gov/greenvehicles/light-duty-vehicle-emissions#history
