There are three water quality parameters that help to measure the quality of water, which include physical parameters, chemical parameters, and biological parameters. The physical parameters include color, taste, odor, temperature, turbidity, solids, and electrical conductivity

When the bus system of Thessaloniki was first established in 1957 all lines were numbered from the eastern to the western routes starting with 1. This applied to all routes from 1 to 29. However, after 1979 the rest of the lines were numbered based on the date of their creation.