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This article presents results of research concerning the possibility of reducing the level of toxic nitric oxides (NOx) emission to the atmosphere. The research has been conducted on DKVR 20-13, PTVM-50 and DE 25-14 gas boilers. The complex character of this issue requires individual consideration regarding each boiler confi guration. Each case requires consideration of characteristics and details of all elements constituting the boiler-furnace unit. The main problem was to establish the reference level to which the reduction of nitric oxides occurs. The actual maximum emission of nitric oxides was assumed as this level. It was verifi ed with the maximum allowable emission of nitric oxides for each boiler. Three levels of the potential infl uence of emission on the atmosphere have been taken into account. This experimental research allowed for proposing an eff ective method, which led to reducing nitric oxides emission by around 30%. Investigations of nitric oxides reduction in industrial-heating boilers with the use of the steam injection method 101 with three GMGB-5,6 gas-mazut burners (Szkarowski et al. 2018). The role of the burners is to burn low pressure natural gas. They were also equipped with mazut injectors, pulverizing it in the steam-mechanical method. Individual fan-ventilating installation of each boiler consisted of VD-10 blast fan and D-10 exhaustion fan. Each boiler was equipped with an individual economizer having heating area of 808 m2. Exhaust gases were discharged to the atmosphere through a common chimney, made of brick, which has 1150 mm in diameter and is 45 m high. Table 1 shows values of fan parameters installed in S.A. Russkie Samocvety boiler plant in Sankt Petersburg. 2. Fourth Krasnovadyeska Boiler Plant in Sankt Petersburg equipped with two PTVM50 boilers, working directly for the purpose of the heating network. They were manufactured in the Czech Republic and their nominal power was 50 MW. This type of boilers has a shaft construction without draught regulators and their convection clusters are located directly above the shielded furnace. The boilers were equipped with 12 standard DKZ burners, placed in two blocks. These blocks were located on the opposite walls of the boiler. Each burner had its own WC 14-46-8 blast fan. Their goal was to burn natural gas, and they were equipped with mazut injectors pulverizing it mechanically. Table 2 presents values of parameters for fans installed in Fourth Krasnovadyeska Boiler Plant in Sankt Petersburg. 3. Kronshtadtskaja branch of GUP (National Unitary Company) “TEK SPB” (Fuel-Energetic Complex Sankt Petersburg) equipped with two DE-25-14 GM boilers. They are dual-drum boilers with the vertical water pipe and the longitudinal location of the drums. Their nominal capacity is 25 t/h, with a possibility of power excess up to 40%. The maximum steam overpressure was 1.3 MPa. Each boiler was equipped with GMP-16 gas-mazut burner. Their goal was to burn medium pressure natural gas, and they were equipped with mazut injectors, pulverizing it in the steam-mechanical method. The individual fan-ventilating installation of each boiler consisted of VD-10 blast fan and D-13-50 exhaustion fan. Table 3 presents values of parameters for fans installed in Kronshtadtskaja branch of GUP in Sankt Petersburg. Operation of each boiler plant assumed use of mazut as an auxiliary fuel. Basing on the analysis of the technical documentation and the boilers’ work card, it was established that mazut is used very rarely. The aim was to create and implement methods leading to the reduction of emission of nitric oxides (Strelets and Vatin 2015, Szyszlak-Bargłowicz et al. 2017, Szyszlak-Bargłowicz et al. 2015, Zając et al. 2017, Walery 2014) during gas burning (Kuropka 2010, Kormilitsyn and Ezhov 2013), with the possibility of switching to mazut burning on the fl y. Methods and ways of determining NOx emission The maximum emission of nitric oxides was estimated in accordance to the methodology proposed in (Collection of methods for calculating emissions of pollutants into the atmosphere by various industries 1986). The amount of NOx emitted to the atmosphere (g/s) converted to NO2, can be counted by using dependence (1) (Krawczyk 2016, Szkarowski et al. 2016, Kuropka 2010, Kormilitsyn and Ezhov 2013, Lee et al. 2006). Table 1. Values of fan parameters installed in S.A. Russkie Samocvety boiler plant in Sankt Petersburg Parameter VD-10 D-10 Output V (m3/h) 24000 50 Pressure H (kPa) 13 75 Motor power N (kW) 20 30 RPM n (min-1) 730 600 Table 2. Values of fan parameters installed in Fourth Krasnovadyeska boiler plant in Sankt Petersburg Parameter WC-14-46-8 Output V (m3/h) 45 810 Pressure H (kPa) 26.93 Motor power N (kW) 55