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IssuesVariability and Change
There are many meteorological conditions that can exacerbate air quality problems.
The lack of cloud at night, which is common when a high-pressure system passes over the State, results in a net loss of radiation (heat) from the ground, causing the ground to cool dramatically. The cold surface cools the air above it, so the coldest temperatures are closest to the ground. Cold air is denser than warm air, so just like water, it flows downhill (i.e. cold air drainage) and pools in topographic low spots (frost hollows). These conditions are referred to as temperature inversions and are the most common meteorological conditions that can exacerbate air quality problems by trapping pollution near the ground.
Temperature inversions are particularly evident during still winter conditions. Launceston and the northern and western suburbs of Hobart often experience inversions during the winter months, but they regularly occur throughout Tasmania. The amount of fog typically indicates the severity of the inversion.
It is important to know what factors increase the potential for poor air quality so that modifications to behaviour/management can be made.
This 'At a glance' section provides an overview of meteorological conditions. More detailed information is available in the Meteorological Conditions Issue Report. While no specific recommendation is presented on meteorological conditions, the issue is closely associated with recommendations on Total Exposure to Air Pollution and Ambient Air Quality Monitoring.
Contact the Commission on: email: firstname.lastname@example.org Phone: (03) 6233 2795 (within Australia) Fax: (03) 6233 5400 (within Australia) Or mail to: RPDC, GPO Box 1691, Hobart, TAS, 7001, Australia
Last Modified: 14 Dec 2006
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