[Evaluation of long-term data on air pollution in regions of petrochemical and oil processing plants].

Long-term observations of air quality in regions with developed petrochemical and oil-processing industry proved that the ambient air is significantly polluted and becomes a severe health hazard. Levels of the air pollution 3 km apart from the enterprises are high, those 10-20 km apart-moderate, those 30 and more km-mild. Materials of air pollution observations over 35 years demonstrate health changes in large population groups.