Are gas ranges safe around parrots?

The range itself is fine. Apparently if you burn a pan that has a non stick surface, it produces something that is toxic to birds. I suppose this could be true of other things that burn. Birds are very sensitive to things in the air. Spray air fresheners are another thing that is not good for them.

If the question refers to allowing parrots to fly around a gas range, that's another matter. Parrots and pet birds should never be allowed to fly freely near any heat source.