The European Commission yesterday launched a three-year investigation into how Europe can better combat air pollution. Many of the European Union’s existing air-quality rules are due to be revised in 2004, and the Clean Air for Europe investigation will provide the framework for new clean-air standards and national emissions caps. The probe will focus especially on particulate and ground-level ozone pollution. E.U. Environment Commissioner Margot Wallstrom said, “We have not yet achieved our final objective, that is to make sure that everybody in Europe, even those who are particularly vulnerable to bad air, can breathe freely.”