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The WestConnex M4 includes a tunnel linking Homebush to Haberfield and a new extension which connects the M4 at Haberfield and the M8. Transurban operates the WestConnex M4 in accordance with the Conditions of Approval established by the NSW Government and approved by the NSW Minister for Planning and Environment Protection Licence issued by NSW EPA.
Monitoring and measuring protocols for each pollutant and parameters are described in the glossary of terms. A Pollution Incident Response Management Plan is also in place as a requirement of the Environment Protection Licence.
The data uploaded to this website comes from air quality monitoring instruments and sensors installed in and around tunnel(s). Ambient air quality data is collected by third parties and may be subject to instrument or communication faults, weather or other environmental events, or server issues.
The data used in the compilation of this page has undergone only preliminary quality assurance checks. This data must be preliminary until a monthly quality assurance check/validation process has been undertaken by a person or organisation accredited by the National Association of Testing Authorities (NATA). For further detailed description and explanation of the quality assurance and data validation process, visit the Office of Environment and Heritage.
Validated data will become available on this page approximately one month after the end of the calendar month. For example, the January data which has been validated will become available at the end of February. Validated air quality data reports are published monthly on this page.
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