Ventilation Stack Air
Ventilation stack air quality
The EastLink tunnels' ventilation system comprises a ventilation station and stack at the exit of each of the tunnels, providing a separate ventilation system for each tunnel. The ventilation system works by fresh air being drawn in at the entry to the tunnels, with the flow of air induced by the flow of traffic, and with the assistance from ceiling mounted fans. Fans within the tunnel and in the ventilation stations enable the air to be extracted through a ceiling mounted vent and then discharged through the ventilation stacks. The ventilation stacks house air quality sampling and monitoring equipment so that emissions into the local environment can be monitored.
One hour rolling average in-stack data for CO, NO2, PM2.5 and PM10 is provided daily on this website.