Clarification for GogoGirl on NOxNOx is formed from molecular nitrogen in the air combining with fuel in fuel-rich conditions which exist in ALL COMBUSTION. Gogotv seems to think that these torches are gonna be used in marshmallow factories and not HEAVY INDUSTRY. Industrial furnaces are also kept under negative pressure, which means NOx gas is not leaking into worker populated areas. It gets discharged out of stacks far away from workers and dissipated over a large area. Real world facts for you to digest gogogirl.