Smog Test Only Center.
 
Inside BPG gas station. At the corner of 19th Ave and Junipero Serra Blvd. Easy access from all directions.
 
From 280 North toward 19th Ave: Stay in the right lane, it's the first gas station to your right.
 
From 19th Ave South (towards 280 South): Stay in the left lane while on 19th Ave. Stay to the left when crossing Junipero Serra Blvd (do not get on 280 South). Follow the MUNI tracks.