Well, i mean, it's also silly in that it only considers tailpipe emissions. PZEV's are already required to have zero evaporative emissions, and besides SULEV ta

Well, i mean, it's also silly in that it only considers tailpipe emissions. PZEV's are already required to have zero evaporative emissions, and besides SULEV tailpipe standards, also be cleaner than 90% of cars of the current model year ZEV's are required to have zero tailpipe emissions, and be cleaner than 98% of cars in the current model year. So ZEV's actually allow forms of emission that the PZEV may not. As long as it isn't an exhaust gas and one of the criteria exhaust gases.