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Pariculate filters are used to reduce soot emissions from diesels. Soot is a concern because of medical research that indicates it could be a contributor to cancer in humans who have long-term exposure from breathing soot-laden air.
The health concerns about soot have been a primary barrier to widespread introduction of diesel engines in the United States.
Pariculate filters have been fitted to a small number of cars in Europe in the last few years. PSA/Peugeot-Citroen SA led the way with the introduction of a particulate filter on the Peugeot 607 2.2-liter HDI in May 2000, supplied by Faurecia. Peugeot remains the particulate systems leader. It started production this year of several models that will have the system as an option.
Renault SA has also been an...