We describe two sites intended for monitoring of СО, СО2, NO, NO2, SO2, O3, , aerosol disperse composition, and meteorological quantities. One of the sites is located in the background zone and the other one in urban area of Tomsk Region. We present characteristics of automatic calibration of gas analyzers using test mixtures or microflow capsules. Observations at the sites are being preformed hourly round the clock. The measurement data are available at the Internet.