[DeliveryValve]

I believe these programs have been around for awhile even though diesel are exempt for emissions testing for now.

Here are some links that you can report a excessive smoking vehicle.

From CARB - Enforcement: Smoking Vehicle Complaint Program

From the Bay Area Air Quality - Smoking Vehicle Report

..... and what happens if you don't return their questioner??

You can always claim that you never received it and was possibly lost in the mail. (like you can do when you are summoned to serve on a Jury and you fail to show up... sssshhhhh )


In the letter is state to see the "enclosed chart for common causes of smoke" can you make a copy?