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The paper discusses the issues of exhaust emissions from farm tractors most frequently used for transport of loads. Transport is an integral part of food manufacturing at almost every stage of the product life cycle. Ready-to-eat food very often needs processing; it often incorporates transport of half products to appropriate facilities. The transport between the processing facilities and the distribution of food products is carried out by typical road vehicles i.e. heavy and light trucks. In the case of agricultural produce it is very often the farm tractors with appropriate trailer sets that are used for transport. The paper presents a comparison of the exhaust emissions and fuel consumption from a farm tractor and a truck. The tests were performed under actual operating conditions in real traffic. For the tests the authors used PEMS equipment (Semtech by Sensors). Both vehicles covered the same route with the same load.

The paper describes the influence of the start-stop system on the exhaust emissions and fuel consumption. The tests were performed for two vehicles. The first one was a vehicle designed specifically to operate in city conditions. It was fitted with a gasoline engine of the displacement of 0.9 dm3 and maximum power output of 63.7 kW. The other vehicle was an SUV (Sports Utility Vehicle) fitted with a diesel engine of the displacement of 3.0 dm3. The measurements of the exhaust emission were carried out on the same route under actual traffic conditions. For the tests a portable exhaust emissions analyzer from the PEMS group SEMTECH DS was used (PEMS Portable Emissions Measurement System).

The paper discusses the problem of exhaust emissions from non-road vehicles. In many cities there are low emission zones for vehicles. Unfortunately non-road engines are excluded from this restriction e.g. construction machinery operates on construction sites, including those located in the said zones. Therefore, the paper presents the results of the exhaust emission tests from an excavator under actual operating conditions. For the tests the authors used a portable exhaust emissions analyzer SEMTECH DS by Sensors for the measurement of gaseous exhaust emissions and SEMTECH LAM for the measurement of the emission of Particulate Matter. The analyzers provide an on-line measurement of the concentrations of the exhaust components under actual operating conditions. The tests performed under actual traffic conditions provide invaluable information regarding the emission during actual operating conditions. In the paper the authors analyzed the relations between the engine operating parameters, vehicle parameters, road conditions (traffic congestion) and the exhaust emissions. The authors, despite differences in the methodology, also presented a comparison of the obtained results with the currently applicable exhaust emission limits in order to draw attention to this issue in urban areas.