"The Measure sets air quality standards that are legally binding on each level of government. Jurisdictions put strategies in place to reduce emissions and to achieve the standards set out below. The standards relate to six criteria air pollutants: carbon monoxide, nitrogen dioxide, photochemical oxidants, sulfur dioxide, lead and particles." "The Measure includes requirements for monitoring and reporting on jurisdictions' performance in reducing the levels of the six specified air pollutants. The goal is for the standards to be met in all States and Territories by 2008, with few exceedences3. In the case of lead, no exceedences are allowed. A review of the Measure is currently underway." (https://www.environment.gov.au/protection/publications/factsheet-national-standards-criteria-air-pollutants-australia)