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Tunnel air quality

WestConnex and Transurban operate WestConnex M8 tunnel, from Kingsgrove to St Peters, with connections to Euston Road, Campbell Road and Gardeners Road. The asset operates in accordance with Conditions of Approval established by the NSW Government.

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)
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Air quality over time

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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

Air Quality in NSW, particularly visibility and particle concentrations, may be impacted from both natural sources (such as weather, fires or dust storms) and human activities. We encourage you to visit NSW Office of Environment and Heritage website for a daily update on Sydney’s current and forecast air quality.

External ambient
WestConnex M8
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Air quality over time

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Raw air quality data

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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

Construction dust has settled on the roads surface and wall panels of the M8 tunnels which has resulted in Ventilation outlet air quality limits being exceeded. This is a temporary issue and is not causing any in-tunnel safety risks for motorists. WestConnex will undertake road sweeping in the coming days to assist with rectifying the issue.

Ventilation outlets
WestConnex M8
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Current snapshot at {{main.previousHour}}

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Table gets updated 5 minutes past every hour
Good Fair Poor
What does good, fair and poor mean.

Air quality over time

Select which locations you would like to display on the graph.

Raw air quality data

Download
Select which data and timeframe you would like to download.

Pollutant measuring locations

Ventilation outlet
 External ambient

Reports

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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.