If there wasn't any dust in the exact shape of the dots you're seeing, the discs are more than likely defective and you should return them immediately. (Strangest thing I saw was somehow a hair got on-- and stayed on-- a blank CDR years ago and burned a lovely shadow onto the disc.
I doubt your drive is kicking up dust, unless it is REALLY dusty. It's probably a defective dye layer. What is the Media ID of these discs? (if you use a program like CD Speed or something it should show you)
Definitely not something I would use for any sort of professional use (or even personal, really!). Dump them and buy some Taiyo Yuden for professional use.