Ammonia free dye is just taking that extra safety measure. As long as you dye your hair in a well ventilated area you're fine. Just no bleach! ;)
Its safe as long as you were in well ventalited area
I just dyed my hair 2 weeks ago and used the same stuff. Your safe!!!
You're fine. :) I didn't use ammonia free. They probably just use it as an extra precaution because it doesn't smell as bad. Since you dyed it outside all is fine. No worries. :)