空氣質量 kōngqìzhìliàng air quality Origin Definitions Defs Strokes Stroke Words Sentences Sents 空气 空氣 kōngqì noun air the gas mixture surrounding the earth, primarily composed of nitrogen and oxygen质量 質量 zhìliàng noun quality degree of excellence of a product or work; equivalent to 品质 pǐnzhì in Taiwan usage