Green Star Smog Check Test Only, Concord

Green Star Smog Check Test Only is a licensed emissions test center, keeping customers' cars regulated. All cars are checked with a BAR-97 Emissions Inspection System that performs a visual, functional, and tailpipe emissions test. These tests are designed to check for the three most harmful pollutants that are emitted from vehicles — CO, HC, and Nox — and determines if these are at a safe level.