What the results tell us for Queanbeyan
Fifty-six substances emitted to air in the Queanbeyan City Council Area were reported to the National Pollutant Inventory (NPI) from 1999–2000 to 2003–04. The majority of reported substances were 'aggregate estimates' from a range of non-facility sources and involved very small quantities.
Two facilities reported air emissions to the NPI during the period—CSR Limited (CSR Emoleum Queanbeyan), which is classified as 'Petroleum and Coal Manufacturing n.e.c.', and Readymix Holdings Pty Ltd (Queanbeyan Quarry), which is classified as 'Construction Material Mining'. Both were low emitters of all reported substances relative to other facilities in Australia.
Air emissions in the Queanbeyan City Council Area are reported here for the first time in the city council's State of the Environment reports.
For comprehensive details of air emission reported in the Queanbeyan City Council Area, such as the types and quantities of substances emitted, see the National Pollutant Inventory website.
About the data
This explanatory note was taken from the NPI website at http://www.npi.gov.au maintained by the Commonwealth Department of Environment and Heritage (2005).
The NPI holds emission data reported by industrial facilities, and diffuse data collected by participating jurisdictions. Industrial facilities are required to report emissions to the NPI if they use more than a certain amount of one or more substances on the NPI reporting list, or consume more than a specified amount of fuel or electric power, or emit more than a certain amount of nitrogen or phosphorus to water. Diffuse data sources include smaller facilities that are not required to report, and mobile and non-industrial sources such as transport, domestic activities and for water catchments and land use type.
The techniques used to estimate emissions in the NPI have been variously approved by Commonwealth, State and Territory environment agencies but it is important to note that the accuracy of these estimates is likely to vary according to the technique used. For the diffuse data in particular, comparative analysis of the data may be misleading, because jurisdictions may have used different approved estimation techniques. Industrial facilities estimate emissions using a technique described in an appropriate NPI handbook, or else otherwise approved.
The listed substances span a wide range of toxicities. A small number may not necessarily imply an insignificant emission: for example, a small emission of a highly toxic substance may be of more concern than a larger emission of a substance of relatively lower toxicity. All emission amounts reported here have been rounded to two significant figures; totals may differ from the sum of the individual amounts on these reports because of this rounding. Some minor discrepancies may also occur with catchment and airshed data, particularly when queried at a fine spatial resolution such as a postcode. This is because these data are collected at varying spatial resolutions.
Department of Environment and Heritage (2005) National Pollutant Inventory, Commonwealth of Australia, viewed 20 April 2005, http://www.npi.gov.au.