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The Netherlands government has started a national program aimed at the setting of ambient air quality standards for an extensive series of compounds. The Committee agrees with the main conclusion of the document that, though evidence is limited, genotoxic carcinogenicity of DCE in humans cannot be excluded. To assess the health risk of ambient air exposure to DCE the committee reccommends a non-threshold linear extrapolation based on the results of the positive oral animal bioassay, as proposed in the document. The committee proposes 1 microgram/cu m as the annual average ambient air concentration of DCE that will not cause more than one extra case of cancer among a million life-time exposed persons. The method of extrapolation implies that an increase of this concentration with a certain factor will result in a proportional increased risk.