Tunnel air quality
NorthConnex is a nine kilometre tunnel linking the M1 Pacific Motorway at Wahroonga to the Hills M2 Motorway at West Pennant Hills. NorthConnex is one of the longest and deepest road tunnels in Australia, removing around 5,000 trucks off Pennant Hills Road each day. NorthConnex is operated in accordance with the Conditions of Approval established by the NSW Government and approved by the NSW Minister for Planning.
Monitoring and measuring protocols for each pollutant and parameters are described in the glossary of terms.
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.
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