In this work, a laboratory-scale burner has been used to investigate the sustainability of mild combustion with the coke oven gas (COG), an industrial byproduct mainly constituted by methane and hydrogen (CH4/ H-2 40/60% by volume). Operating conditions for stable mild combustion have been identified and operating parameters maps have been deduced for this hydrogen-containing fuel, evidencing low NO, and CO emissions. With respect to the well-established, clean mild combustion of methane, mild combustion of coke oven gas required larger jet velocity but allowed for using lower average furnace temperatures. Also demonstrated was the ability of hydrogen to lead to completion the hydrocarbon oxidation in very dilute conditions such as those created by the mild technology. These findings, together with the potentiality of mild conditions for soot depression and destruction, open the possibility of using hydrogen as a doping agent for burning, with this technology, industrial wastes, and low-calorific dirty fuels.