The Auto Asthma Index is a pollution report card for today's automobiles. Based on real world pollution measurements for more than 2.5 million vehicles in California's Smog Check program—as well as automaker's estimates for 3,737 newer vehicles—the Auto Asthma Index provides pollution ratings and brand-by-brand comparisons that can help you choose the cleanest vehicles. Our Index even takes into account the local air quality patterns of the region where you and your family live.
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