And, as usual, Consumers Union joins with the lefties to advocate for unaffordable cars, in opposition to their consumer oriented mission.
One trick that the CCCI pulls is that they conflate "healthy" and "clean" air with "climate change". I think everyone agrees that smog forming compounds such as NOx and ammonia are dangerous. The automakers have met every LEV requirement thrown at them, drastically reducing the amount of air pollution from combustion and fuel evaporation.
However, CO2 is not a carcinogen, and it doesn't form smog or acid rain. It's plant food. Hypothetically, a hydrocarbon fuelled vehicle could be designed which would combust its fuel so cleanly, and apply an effective aftertreatment, so that the exhaust would be composed only of CO2, NO2, and H20--complete combustion, with allowance for nitrogen interactions. However, CCCI would not consider this "clean and healthy" air, because of the global warming lobby.
CCCI would be better off advocating for the removal of dirty-running old cars from California's roads, and going after non-transportation sources such as lawnmowers, boats, and airplanes, if they were serious about the health effects of real pollution.