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The aim of the paper is to assess the possibility of decreasing the chosen environmental indicators like energy consumption, greenhouse gas (GHG) production and other exhaust pollutants in the selected region in Slovakia by introducing Liquefied Natural Gas (LNG) buses into bus transport. The assessment is carried out by comparing the consumption and emissions of current buses (EURO 2) in real operation, with potential buses (EURO 6) and with pilot LNG buses testing on the same lines. Comparison took place under the same conditions over the same period. The study measures the energy consumption and GHG production per bus. The research paper also compares two methodologies of calculation. The first calculation is according to the European Standard EN 16258: 2012 which specifies the general methodology for evaluation and declaration of energy consumption and GHG emissions (all services - cargo, passengers or both). The second calculation is according to the Handbook of Emission Factors for Road Transport (HBEFA). The results of the calculation are compared  by both methods, and the most suitable version of the bus in terms of GHG emissions is proposed.

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The aim of the article is to analyze the mobility of Polish residents and a change caused by the COVID-19 pandemic. For this purpose, a questionnaire study was conducted on changes in the mobility of Polish residents before and during the COVID-19 pandemic. It was carried out in December 2020, when the second wave of cases of the above-mentioned virus was ongoing in Poland. During the study of Polish residents, questions were asked about the purpose of their trip, means of transport, distance to the destination and duration of the trip, as well as the place of making purchases before and during the pandemic. In addition, respondents were asked whether the COVID-19 pandemic had affected their mobility. During the COVID-19 pandemic, the mobility of citizens, especially in the cities, has changed. Instead of using the public transport, they used cars, bicycles and walk.