How tunnels with ventilation outlets work

Fresh air

Axial fans

Jet fans

Surface road emissions

Air flow by piston effect

Fresh air

Less time in the car

Reducing stop-start traffic

How air moves in tunnels

Less vehicles on local streets

Why tunnels are built

Air quality monitoring

Emissions readily dispersed

Air quality database (who.int)

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PM_2.5 pollution charts and maps data sources: 'Ambient Air Quality Database', World Health Organisation, 2023 (for data outside of Australia). For more information and full disclaimers regarding data collection, measurement, estimations and limitations, please view the WHO Air Pollution web page. Air quality monitoring reports, Australian state governments, 2019 - 2022 (for data within Australia). For more information regarding the Australian National Environment Protection (Ambient Air Quality) Measure, please visit the Australian National Environment Protection Council web page.

Transport for NSW pays respects to Elders past and present, and recognises and celebrates the diversity of Aboriginal peoples and their ongoing cultures and connections to the lands and waters of NSW.