SLO Smog is San Luis Obispo’s premiere test only emissions compliance facility. SLO Smog can have your 2000 and newer gas or hybrid vehicle, as well as your 1998 or newer diesel vehicle, tested and on the road in 20 minutes. With easy online scheduling, SLO Smog is available at your convenience. Simply click the BOOK NOW button above to get an appointment at your preferred time slot, or stop by and take advantage or our regular drive-up business hours.