A study published in Denmark looks likely to increase pressure to bring forward the "Euro IV" deadline for fitting diesel particle filters and to create incentives to fit particle filters to existing diesel vehicles. Diesel sales have risen in response to demands for cuts in carbon dioxide (CO2) emissions, but diesel engines emit higher levels of fine particulates than petrol-driven ones (EED 08/04/02).
Writing in the Danish magazine Doctors' Weekly, Ole Raaschou-Nielsen of the Institute of cancer epidemiology calculates that only one-third of the average concentration of 22 micrograms of particulates per cubic metre is from natural sources. Most of the rest is emitted by motor vehicles.
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