除了指导值之外，空气质量准则也为有关室外空气污染的每项空气污染物提出了过渡目标，以便促进逐渐从高浓度向低浓度过渡。
In addition to guideline values, the AQGs give interim targets related to outdoor air pollution, for each air pollutant, aimed at promoting a gradual shift from high to lower concentrations.
2005年空气质量准则第一次为可吸入颗粒物（PM）确定了一项指导值。
The 2005 AQG set for the first time a guideline value for particulate matter (PM).
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