Emissions to air have the potential to adversely impact upon health, the environment and local public amenity. In response to these potential impacts, we collect data for key emissions to air from stationary and mobile emission sources. For our Australian operations we report annually on these emissions to the National Pollutant Inventory.

Outside of greenhouse gas emissions, our main emissions to air are dust generated by stockpiling and moving materials and from vehicles operating on unsealed surfaces, and oxides of sulphur and nitrogen from the burning of fuels. In addition, dust emissions may create visual amenity issues and can pose a potential risk to human health. At the Rosebery operation, two new high volume air sampling machines were installed to improve dust monitoring coverage of the mine site and the adjacent township. A major dust characterisation survey continued throughout 2008 which, once completed, will lead to improved controls for different sources of dust at the operation.

Throughout 2008 we continued to undertake action to address two Environmental Protection Orders in respect of activities at the Karumba port facility, the first from June 2007 and the second issued in March 2008 by the Queensland Environmental Protection Agency. These orders relate to the implementation of improved controls for dust generation at the port facility and the implementation of programs to better monitor dust emissions at Karumba, including the potential impact on metal levels in rainwater tanks. In accordance with these orders, OZ Minerals implemented a community-wide monitoring program of rainwater tanks and improved housekeeping procedures at the port facility to minimise the release of mineral concentrate dust. OZ Minerals continues to work with its independent air quality specialists and the Environmental Protection Agency to ensure compliance at the Karumba port facility.