I was driving through our hippy town in my smoky old 356 many moons ago. I was coming up on one of the old hippies on his bicycle and as we passed he pointed at me and shouted, "You're polluting!!" I looked in my mirror and watched him ride off the street into a tree. Cracked me up. I may not have known much about pollution but I was smart enough to keep both hands on the wheel.

So when do you have to report for your "mandatory emissions test"? From reading the online information Air Pollution Control Division - Smoking Vehicle Hotline

It appears you can complain about someone and the Air Pollution Nazi's send you a letter. Then you have to prove them wrong? Can you confront your accuser?

Yes, every two years. there are also the 'drive-by' roadside things. If you drive by one and pass then it's noted on your registration and you can bypass the brick-and-mortar emissions facility.

Hey man, if you see something, say something, right? :/

There's no additional requirement if you receive this letter. Sure, you have to take your biannual emissions test just like you would anyway. This thing is just a waste of everyone's time.

Especially since the car isn't smoking! It's probably the cleanest exhaust vehicle I have. The SC is pretty good though.

Well, you are in Denver..

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Did it say if the smoke was coming out the tailpipe or the windows?