In Chicago, IL, smog forms primarily from volatile organic compounds in auto exhaust. Find the best and worst autos for your town.
2004 Kia Spectra
Check the Auto Asthma Index for a different vehicle.
See the cleanest and dirtiest automakers ranked by the Auto Asthma Index.
REPORT HOME | IN YOUR TOWN | RATE YOUR VEHICLE | WHAT YOU CAN DO | AUTOS & ASTHMA | FAQ