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Information on the ozone concentration in the surface air and troposphere in the first half of 2020 is presented. The data were acquired at 13 stations in different Russian regions; vertical distributions were obtained with the use of an aircraft laboratory. The excess over the Russian Federation hygienic standards is assessed; the daily average ozone concentration is found to be regularly higher the maximum permissible concentrations at most stations. At some stations, there are features the seasonal variations in the ozone concentration in the period under study different from previous years.

We present information on ozone concentration in the surface air layer in the second half of 2020. Data were obtained at 13 stations located in different regions of Russia. We estimated the excess over hygienic standards of the Russian Federation, both in the second half of the year and throughout 2020. It is shown that the daily average maximum permissible concentration of ozone is regularly exceeded at all stations. There are cases of exceeding the one-time maximum permissible concentration.

The beneficial synergism between selenium (Se) and other antioxidants on human health stimulates the search of new medicinal plants with high antioxidant activity (AOA) and Se accumulation levels. Using fluorimetric method of Se analysis and titrimetric method of total AOA determination monitoring was achieved of 53 species of herbs, 24 species of deciduous and evergreen trees and shrubs and 11 species of conifers grown on the Southern and SouthEastern coast of the Crimean peninsular. Two new Se-hyperaccumulators were indicated among deciduous trees: Tamarix ramosissima and Paliurus spina-christi with leaves Se content 6236 and 1800 µg. kg-1 d.w. respectively. Among herbs 5 new hyperaccumulators were revealed: Artemisia draсunculus cv. Izumrudny, Anthemis tranzscheliana, Cota tinxtoria, Astragalus arnacantha and Limonium gerberi with Se accumulation levels of 23460, 9479, 960, 4110, and 1926 µg. kg-1 d.w. respectively. Medians of Se levels reached 97 µg. kg-1 for conifers, 86.5 µg. kg-1-for deciduous plants and 61 µg. kg-1-for herbs with the appropriate AOA values: 67, 70. and 49.3 mg-GAE.g-1 d.w. respectively. Tamarix was the only plant with both Se hyperaccumulation abilities and high AOA level (212 mg-GAE. g-1 d.w). High AOA (188-256 mg-GA E. g-1 d.w) and relatively high Se levels (193-236 µg. kg-1) were demonstrated for Pistacia atlantica and Cotinus coggygria.

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