title: [Grading of air quality indexes and its application].
authors.forename: Y H
authors.initials: YH
authors.lastname: Yue
authors.forename: Y
authors.initials: Y
authors.lastname: Liu
mesh_terms: D000393:Air Pollutants / Q000032:analysis*; D004784:Environmental Monitoring; D006801:Humans; D008433:Mathematics; D008452:Maximum Allowable Concentration; D013431:Sulfates
chemical_list: D000393:Air Pollutants; D013431:Sulfates