title: [Decreased oxygen content in the atmosphere--an ecological disaster imperceptibly sneaking up?].
abstract: With the use of gas chromatography there have been done 112 analyses of an oxygen content in the air of St. Petersburg. The results were computer-processed with an application of the standard programs of statistical analysis and program of analysis of the extreme values which permitted to provide the stability of the studied process. In an autumn-winter period (November-January) the values of oxygen content in the air in 37 measurements have been different from the norm in that they declined more than 0.5% and in 12 measurements-approximately by 1%. The mean values of December and January differed from the norm by 0.652; 0.639; 0.834%, respectively. In February, the mentioned changes were smoothed over. As a result of a decrease of oxygen in the period when the green plants stop air purification, the air composition ceases to content, which is the indication of a partial disorder of regulating activity of the biota.
authors.forename: N I
authors.initials: NI
authors.lastname: Moiseeva
mesh_terms: D001272:Atmosphere; D002849:Chromatography, Gas / Q000706:statistics & numerical data; D004463:Ecology; D004777:Environment; D010100:Oxygen / Q000032:analysis*; D012426:Russia; D012621:Seasons; D013997:Time Factors
chemical_list: D010100:Oxygen