M4 tunnel air quality
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 in-tunnel air quality monitoring shows data for:
- Carbon monoxide (CO)
- Nitrogen dioxide (NO2)
- Visibility (K)
Alert
For a daily update on Sydney's current and forecast air quality visit the NSW Office of Environment and Heritage website.
The external ambient air quality monitoring shows data for:
- Carbon monoxide (CO)
- Nitrogen dioxide (NO2)
- Particles less than 2.5 micrometers in diameter (PM2.5)
- Particles less than 10 micrometers in diameter (PM10)
- Standard deviation in wind direction (Sigma theta)
- Temperature at 2 metres (ºC)
- Temperature at 10 metres (ºC)
- Wind direction (degrees)
- Wind speed (m/s)
Alert
For a daily update on Sydney's current and forecast air quality visit the NSW Office of Environment and Heritage website.
The M4 Tunnels have been open since July 2019, and monitoring at the following locations was no longer required by the Department of Planning, Industry and Environment:
- Allen St
- Concord Oval
- Haberfield Public School
- Powells Creek
- St Lukes Park
All data up until 30 September 2021 is available on this website. Read more about the positive local air quality results from the M4 Tunnels here.
The ventilation outlet air quality monitoring shows data for:
- Carbon monoxide (CO)
- Nitrogen dioxide (NO2)
- Oxides of nitrogen (NOx)
- Solid particles
- Volatile organic compounds (VOC)
Alert
For a daily update on Sydney's current and forecast air quality visit the NSW Office of Environment and Heritage website.
M4 Reports
M4 and M8 extensions Reports
Disclaimer
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.
If you require more information or have questions about our site's disclaimer, please feel free to contact us by email at info@westconnex.com.au.