The paper presents a growing threat to the natural environment caused by the avalanche growth in the number of trucks and cars within the urban areas and beyond their borders. Based on the example of the Szczecin agglomeration - located at the crossroads of the east-west and north-south transit routes - selected harmful components associated with the use of trucks and their negative impact on the human lives and functioning of the ecosystem in Poland have been discussed.
In the article the development of modern engines witrh spark ignition has been presented based on theiroperational parameters. Comparison with the parameters of modern engines used in agriculture has been conducted and based on the usefulness of evaluated engines has been determined.