An unusual excursion for pupils of Secondary School No. 35 in Naberezhnye Chelny was conducted by employees of the Prikamskiy Territorial Administration of the Ministry of Ecology and Natural Resources of the Republic of Tatarstan. During the event, the basic working principles of the employees of the specialized inspection of analytical control were explained to the participants, as well as examples of determining a number of chemicals in the natural environment were shown.