The 2005 AQG set for the first time a guideline value for particulate matter (PM).
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。
They recommend revised limits for the concentration of selected air pollutants: particulate matter (PM), ozone (O3), nitrogen dioxide (NO2) and sulfur dioxide (SO2), applicable across all WHO regions.
它们为下述选定的空气污染物的浓度限值提出了修订：可吸入颗粒物(PM)、臭氧(o3)、二氧化氮(NO2)和二氧化硫(SO2)，适用于世卫组织所有区域。
The working principle of the system is: DPF filters the particulate matter (PM) in diesel engine exhaust, to make emission up to certain standard.
系统工作原理是：DPF过滤柴油机排气中的颗粒物（PM），从而使排放达到相应的标准。
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