[Hygienic evaluation of the influence of environmental factors on adolescents' health in a gas-and-oil producing region].

Environmental factors in a gas-and-oil producing region were hygienically evaluated for their influence on the health of adolescents living in the towns of the Khanty-Mansi Autonomous District (KMAD) - Yugry. The air was found to be polluted by incomplete oil and gas combustion products from flares, by emission from emergency conditions at gas-and-oil-producing enterprises. The major ambient air pollutants were formaldehyde, nitrogen dioxide, and suspended solids. The hazard indices upon combined exposure to chemicals were 9.81, 7.65, 4.79, and 4.01 in Nizhnevartovsk, Surgut, Nefteyugansk, Khanty-Mansiysk, respectively. The population's potential health risk associated with a water factor in all the four towns was due to the presence of manganese and silicon. Hazardous substances available in the ambient air and water, as well as natural and climatic living conditions were ascertained to influence the health of adolescents. The results of the study served as a basis for substantiation of measures to reduce pollution of ambient air and drinking water supply objects in the KMAD-Yugry and a package of measures to improve the health of adolescents.