An exhaust particulate trap system was developed for an automotive diesel engine 6120q used in urban buses.

开发了一种用于市内公共汽车的6120 Q型柴油机的排气微粒后处理器。

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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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The diesel engine exhaust doubled the background particulate matter levels found outdoors at its peak.

BBC: Image of a smoke filled room