The Air Quality Standards (Wales) Regulations 2010
These Regulations implement the following Directives—Directive 2008/50/EC on ambient air quality and cleaner air for Europe. (This Directive replaces Council Directive 96/62/EC on ambient air quality assessment and management, Council Directive 1999/30/EC relating to limit values for sulphur dioxide, nitrogen dioxide and oxides of nitrogen, particulate matter and lead in ambient air, Council Directive 2000/69/EC relating to limit values for benzene and carbon monoxide in ambient air, and Council Directive 2002/3/EC relating to ozone in ambient air); andDirective 2004/107/EC relating to arsenic, cadmium, mercury, nickel and polycyclic aromatic hydrocarbons in ambient air.