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Biodiesel is still in limbo here in the U.S., but even if we never return to large scale production, at least diesel vehicles can continue to get cleaner on their own. The latest example of cleaner diesel tech news comes from Finland, where Pegasor Ltd. has introduced a new, compact, continuously operating and real-time particulate matter (PM) sensor, known as PPS-M. Pegasor, which sounds like the name of really bitchin' one-legged T-Rex, says that the sensor can be installed in the engine exhau