LEAD Action News

LEAD Action News Vol 3 no 2 Autumn 1995 ISSN 1324-6011
Incorporating Lead Aware Times ( ISSN 1440-4966) and Lead Advisory Service News ( ISSN 1440-0561)
The journal of The LEAD (Lead Education and Abatement Design) Group Inc.

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bridge.gif (2813 bytes)Sydney Harbour Tunnel Air lead Shock

A study carried out for the Roads and Traffic Authority (RTA) in October and November 1994 looked at the composition of exhaust gas emissions from the NSW motor vehicle fleet. The data gained from this study was to be used to validate the motor vehicle component of the Metropolitan Air Quality Study emissions inventory as well as information on the mass emission rates to enable models to be established for road side pollutant concentration estimations.

The ventilation exhaust system of the harbour tunnel enabled pollutant concentrations of carbon monoxide, sulphur dioxide, oxides of nitrogen, benzene, total hydrocarbons and other air toxins to be measured while the breakdown bays of each tunnel were used to measure total suspended particles (TSP), particles contributing to PM IO, lead in TSP and dioxins.

The average lead concentrations found were 4.2* and 5.7 g/M in the Southbound and Northbound tunnels respectively. The average T'SP concentration in the Southbound tunnel averaged 218 g/M (ranging from 160-260 g/M) while the levels in the Northbound tunnel were higher, averaging 372 g/M (ranging from 178-497 g/M). The higher values found in the Northbound tunnel are due to the position of the sampler on an uphill gradient where vehicles are under load.

An average of 128 g/M was recorded for PM 2.5 (a range of 73-197 g/M This corresponded to a range of 0.19-0.46 for the ratio of PM 2.5 to TSP concentration. High particle concentrations were observed with peak morning traffic and continued to vary with changing traffic volumes.

*The Australian ambient lead in air standard is 1.5 g/M (micrograms per cubic metre) 90 day average.

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Last Updated 16 November 2012
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