Research Article Open Access

Recent Trends in Ozone and Particle Concentrations in the Sydney (Australia) Airshed

Merched Azzi and Hiep Duc


An overview is presented of changes in ground level ozone and atmospheric fine particles determined using ambient monitoring data collected at selected locations in Sydney, Australia. After removing seasonally, auto-regressive and moving average dependence from the selected time series, the trend of a selected series was modelled using the fractional long-term dependent component. The selected technique was able to detect the trend at a very small resolution. The method results were compared to the trends obtained using the Rao-Zurbenco method. For selected monitoring stations, between 1980 and 1993, there was a decrease in ozone concentrations followed by a slight increase between 1994 and 2002, and thereafter a stable concentration. Fine particle concentrations as measured by nephelometry, showed a significant decrease from 1980 to 1990, which stabilised beyond 1994.

American Journal of Environmental Sciences
Volume 4 No. 5, 2008, 454-461


Submitted On: 17 April 2007 Published On: 31 October 2008

How to Cite: Azzi, M. & Duc, H. (2008). Recent Trends in Ozone and Particle Concentrations in the Sydney (Australia) Airshed. American Journal of Environmental Sciences, 4(5), 454-461.

  • 3 Citations



  • Long-term ozone data
  • trend analysis
  • fine particle
  • long range dependence method