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Air pollution is a challenge for municipal authorities. Increased emission of PM10 and PM 2.5 particles is particularly noticeable in the fall and spring period. That is due to the start of the heating season. According to KOBIZE (The National Centre for Emission Management) data, in 2016 the main sources of PM10, PM2,5, and PAH (polycyclic aromatic hydrocarbons) emissions were non-industrial combustion processes (45%, 48% and 88% respectively of the total amount of emissions of such substances, estimated at 259 156,3 Mg, 145 506,9 Mg and 146,3 Mg), the predominant share of which came from the combustion of solid fuels by households. In turn, in the case of nitric oxides (NOX), the industrial sector was the biggest source of emissions (38% of the total amount of emissions of these substances, estimated at 726 431,2 Mg) and road transport (32%). Lack of sufficient airflow causes the above dust and others to stay suspended above the city creating smog. According to the above data, road transport accounted for approximately 5% of the creation of PM10 particles, c. 7% of PM2,5 and approximately 32% for NOX. In Poland, suspended particles (PM10 and PM2,5) cause deaths of as many as 45,000 people a year. The issue of smog also affects other European cities. Therefore, it is necessary to undertake concrete efforts in order to reduce vehicle exhaust emissions as much as possible. In the case of efforts in road transportation sector, several solutions are possible. One is to utilize vehicles with alternative propulsion systems (electric vehicles, vehicles equipped with fuel cells). The use of hybrid vehicles would be justifiable in the meantime. Nonetheless, in 2016 for example, alternative fuel vehicles and those with alternative propulsions accounted for a tiny minority (0.03%) of the vehicles registered. It is therefore justifiable to reduce the emission of exhaust pollution, particularly NOX, PM, PN by conventional passenger cars powered by compression ignition engines. Emissions by these passenger cars have been reduced systematically. Comparative tests of the above emission of exhaust pollution were conducted on chassis dynamometer of such passenger car in NEDC cycle and in the new WLTC cycle in order to verify the level of emissions from the above passenger cars (Euro 6 emission level). Measurements of fuel consumption by that car were also taken. Emission of exhaust pollution and fuel consumption of the said car was also addressed as part of the RDE road test.