Low-key cars have a clean-air secret

Imagine cars so clean that their tailpipe emissions contain less pollution than the air around some California freeways. They’re not hybrids, the media darlings of the environmentally correct. Rather, they’re clean air’s best-kept secret: 31 familiar gas-burning 2004 models that have met a strict new California pollution standard. The Honda Accord, Ford Focus, BMW 325i and Volkswagen Jetta are among the “PZEVs,” which stands for “partial zero-emission vehicles.”