空气质素指标就七类广泛的空气污染物制定的指标。这些指标缺乏法律约束力。
The AQOs set target amounts for seven widespread air pollutants, but are not directly enforceable.
地衣对环境污染极端敏感，可作为测试空气质素的指标。
Lichens are extremely sensitive to atmospheric pollution and can be used as indicators of air quality.
地衣对环境污染极端敏感，可作为测试空气质素的指标。
Lichens are extremely sensitive to atmospheric pollution and can be used as indicators of air quality.
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