An assessment against Victoria’s air quality objectives and goals is shown in the 2007 data tables.
In Melbourne there was a higher than usual number of days when the particle (particularly PM10 and visibility) objectives were not met. Elevated particle levels and poor visibility occurred mainly on days affected by bushfires (in January) and planned burning (in April). Particle levels were also elevated on days affected by windblown dust or when local emissions, particularly from motor vehicles and wood heaters, were trapped in calm, highly stable conditions.
The ozone objectives were exceeded at most monitoring stations in Melbourne on one day in January due to bushfires. The ozone goal was met at all stations except Macleod, where there were two exceedances of the four-hour objective due to bushfires.
The air quality objectives for nitrogen dioxide, carbon monoxide and sulfur dioxide were met on all days in 2007.
Air toxics levels were monitored at Carlton, Mooroolbark and South Melbourne in 2007. Levels were low and met the limits specified in the National Environment Protection Measure (NEPM) for Air Toxics.
In Geelong, there was a higher than usual number of days when the particle (PM10 and visibility) objectives were not met. As was observed in 2006, windblown dust was the major cause of high particle levels (rather than smoke from bushfires or planned burns). Due to these dust impacts, Geelong had more days that did not meet the PM10 objective than any other station in 2007.
Whilst the ozone goal was met, the objectives were exceeded on one day (at Point Henry) in January due to bushfires.
The objectives for nitrogen dioxide, carbon monoxide and sulfur dioxide were all met.
In the Latrobe Valley, smoke from bushfires and planned burns resulted in a large number of days when the particle (as PM10) and/or visibility objectives were not met. Due to proximity to the fires, the air quality impacts in the Latrobe Valley were greater than those experienced in Melbourne.
While the ozone goals were met, the bushfires resulted in one day in January when the four-hour ozone objective was exceeded at Moe and Traralgon.
The objectives for nitrogen dioxide and sulfur dioxide were met on all days.
Air toxics levels were monitored at Traralgon in 2007. Levels were low and met the limits specified in the Air Toxics NEPM.
In Warrnambool a 13-month monitoring campaign concluded in October. Like other areas of Victoria, the major impact on Warrnambool’s air quality in 2007 was smoke from bushfires, both in January from fires in NE Victoria and in February from fires burning locally and in Tasmania. These fires led to days not meeting the visibility objectives. The particles (as PM10) and ozone objectives were met at Warrnambool in 2007.
EPA has published a separate report on the campaign monitoring at Warrnambool.
In Wangaratta, a 12-month monitoring campaign concluded in December. Wangaratta experienced significant bushfire impacts in January, with both visibility and particle (as PM10) objectives frequently exceeded. In addition, during the colder months of the year, a build up of pollutants (including smoke from wood heaters) on calm, cold autumn/winter nights led to poor visibility on many occasions.
Whilst the ozone goals were met, the bushfires resulted in one day in January when the four-hour ozone objective was exceeded at Wangaratta.