A study of air qualities has been done in 11 Siberian cities from Irkutsk (easternmost) to Novosibirsk (westernmost) in winter and summer with a mobile measurement station. It is shown that in winter a modern industrial city is not only a "heat island", but also a "pollution island". Admixtures concentration in centers of most cities is much higher than in their periphery. The exception is ozone, which is apparently destroyed by industrial emissions in the center and replenished in the periphery. In summer the local circulation is considerably weakened, and the difference between the parameter values for the center and periphery not always remains.

The influence of the Tomsk city on the chemical and disperse composition of surface atmospheric aerosols has been estimated by means of carrying out several continuous measurement campaigns at two different sites (urban and rural). It is shown that the determining factors in formation of aerosol field over a moderate city are the prehistory of air masses and the activity of erosion processes in summer.