该报告旨在就CEN/TC 264工作组的不确定性评估提供指导，该工作组参与制定“环境空气质量参考方法”，欧盟“欧盟环境空气指令框架指令”质量评估与管理（96/62/EC）

The Report is to provide guidance on uncertainty evaluation to CEN/TC 264 Working Group(s), who are involved in the preparation of Reference Methods to measure ambient air quality, as required by the EU Daughter Directives of the European Framework Directive on Ambient Air-quality Assessment and Management (96/62/EC)