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Particulate emission from diesel engines is one of the most important pollutants in urban areas. With increasing worldwide regulatory requirements to lower particulate matter (PM) standards for heavy duty diesel powered vehicles, the interest in diesel particulate filter based emission control solutions such as the Continuously Regenerating Technology (CRT®) have significantly increased. This system has been applied to thousands of heavy-duty diesel vehicles in Europe over the last six years to meet various local and governmental requirements, while recently introduced in the US. Among the numerous demonstration programs taking place in the US, one important one is the evaluation of CRT filter systems on urban transit buses in NY City. Here, several NY City transit buses with DDC Series 50 engines have been equipped with CRT filters and operating on ultra low sulfur diesel (< 30 ppm S) in transit service in Manhattan since February 2000.