Tunnel air quality

Transurban operates the Clem7, which includes a tunnel linking Brisbane's inner north to the southern and eastern suburbs, in accordance with the air quality requirements set by the Queensland Government.

We’re using technology to adapt our tunnel ventilation systems to better align with traffic flow in the tunnel and allow air to be released from tunnel portals as well as ventilation outlets. Tunnel portal ventilation will only occur during off peak periods when there is less traffic on the road. These improvements will reduce energy consumption while maintaining safe air quality both inside and outside the tunnel.

The Clem7 tunnel portals are located in Woolloongabba, Kangaroo Point and Bowen Hills, and the ventilation outlets are located in Woolloongabba and Bowen Hills.

Clem7 opened in March 2010 and since June 2021, ambient air quality monitoring is no longer required by the Department of Environment and Science. The following air quality sites have since been decommissioned:

  • Northey St, Windsor
  • Royal Brisbane Women’s Hospital, Butterfield St, Herston
  • Hawthorne St, Woolloongabba
  • Land Centre, Vulture St, Woolloongabba

Ambient air quality reports until the end of June 2021 are available on this website.

The in-tunnel air quality monitoring shows data for:

  • Carbon monoxide (CO)
  • Nitrogen dioxide (NO2)
  • Visibility (K)



The data used on this page is collected by third parties using equipment which is not controlled by Transurban Queensland and as such may be subject to faults or errors by third parties, external weather or environmental events, or server access issues. The data comes directly from the air quality monitoring instruments and sensors and has not been validated.

This data may be adjusted at a later time through a standardised procedure to account for instrument errors. Once data has been validated, a validated data report are posted on the air quality reports page.