On behalf of DoHA , NICNAS provided technical expertise on a fee-for-service basis to two working groups contributing to the development and revision of Air Quality National Environment Protection Measures under the EPHC. The Tier 2 Air Toxics Working Group developed a methodology to prioritise air pollutants, and this was endorsed by the EPHC in June 2006. The ongoing Air Standards Setting Working Group is assessing international and Australian approaches to setting air quality standards, with the aim of updating and improving the methodology for setting air standards in Australia.