It's been well-established at this point that azodicarbonamide is a relatively common ingredient in processed foods. But
We have been eating fast food sandwiches made with azodicarbonamide for years. If you don't eat that stuff very often, I doubt you have anything to worry about. And if you do eat a lot of fast food sandwiches, I'd venture to say that azodicarbonamide is probably the least of your concerns.
Subway says it's in the process of removing a chemical from its bread as part of an ongoing effort to improve its recipes.