Welcome to our tunnel
air quality portal

In NSW, our extensive network of state roads stretches over 25,000 kilometres, with 9 major metropolitan tunnels playing a crucial role in relieving congestion. As NSW’s population grows, congestion within our road networks will continue to be a challenge, affecting road efficiency, air quality and the wellbeing of our communities.

By shifting traffic into tunnels, we provide smoother journeys, better managed traffic flows and effective management of exhaust emissions through ventilation systems.

Our tunnels are built to meet strict air quality standards using state-of-the-art ventilation and tunnel design. At Transport for NSW, our customers and communities are at the centre of everything we do and guide us towards building a safer and more sustainable transport network.