Kazan residents sent a message to the Ministry's hotline about an unpleasant smell in the Aviastroitelny district. Specialists of the Central Department of Environmental Supervision of the Ministry of Ecology left on a mobile ecological laboratory to Akademik Pavlov str, 17 At night, from 23:00 to 00:00, environmentalists took samples of atmospheric air in automatic mode using special equipment installed on the PEL. The samples were analyzed according to 14 indicators: carbon monoxide, nitrogen oxide, nitrogen dioxide, ammonia, sulfur dioxide, hydrogen sulfide, benzene, toluene, ethylbenzene, m, p-xylene, o-xylene, acetone, isopropylbenzene, butyl acetate. According to the results of the analysis of samples, no exceedances relative to the maximum single maximum permissible concentration were detected.