title: Method for comparing concentrations of the open-air factor.
abstract: It is shown how concentrations of the open-air factor may be compared from day to day; this has not been possible previously.
mesh_terms: D000391:Air Microbiology; D004926:Escherichia coli / Q000378:metabolism; D008433:Mathematics; D010100:Oxygen; D013997:Time Factors
chemical_list: D010100:Oxygen