Green Star Smog Check, Sunnyvale

Green Star Smog Check's technicians help keep California's air clean—and give drivers the info they need to register or sell their cars—by inspecting vehicles' pollution emissions. They typically take only 15 minutes to conduct the test, which requires no appointment beforehand, and they invite customers to pass the time in a clean waiting room with complimentary WiFi. Afterward, they can issue a shiny gold star or a certificate of compliance stating that the automobile meets state requirements.