This standard establishes the maximum concentration limits for NOx (NOx is the sum of the concentrations of NO and NO2), in dry undiluted products combustion
GOST R 50591-1993 history
2013GOST R 50591-2013 Gas-consuming thermal units. Industrial gas burners. Limiting concentration rates of NOx in combustion products
1993GOST R 50591-1993 Gas-consuming thermal units. Industrial gas-burners. Limiting concentration rates of NOx in combustion products