Current DataHistory
In Tunnel Data
 Past Months

Ambient Data

Ambient data for Mary Anne Street Park and Tumbalong Park Air Quality Monitoring Sations has ceased being displayed. Permission was granted from the Director - General of the Department of Planning to approve the closure of the two ambient monitoring stations in accordance with the Planning Ministers Approval Conditions 263, 265 and 269.

Ambient

Validated monthly summaries of CO, NO2 ,PM2.5 and PM10 are also available up to August 2008. Hard copies of monthly validated reports (containing ambient and in-tunnel data) are available from the Customs House Branch of the City of Sydney Council Library.

Ambient Air Quality Goals

DIPNR placed conditions of approval on the Cross City Tunnel such that stack emissions do not result in ambient air quality readings at the monitoring stations exceeding:

  • CO - 8 hour rolling average of 9.0 ppm;
  • NO2 - one hour average of 245µg/m3 (12.0 pphm);
  • PM10 - 24 hour average of 50µg/m3.

In-Tunnel

CO data for a given hour will be available at 30 minutes after the following hour. For example, data for 09:00 to 10:00 is available at 10:30.

Monthly summaries of CO are also available on this site. To view the most recent data go to the In Tunnel Data.

Historical data is available in tabular form for the following time periods:

Hard copies of monthly validated reports (containing ambient and in-tunnel data) are available from the Customs House Branch of the City of Sydney Council Library.

In-Tunnel Limits

DIPNR placed conditions of approval on the Cross City Tunnel such that the in-tunnel CO air quality does not exceed the following exposure and single point limits:

  Exposure

  • CO 1305ppmm rolling 15min average (87ppm multiplied by 15 minutes)
  • CO 1500ppmm rolling 30min average (50ppm multiplied by 30 minutes)
  Single Point
  • CO 200ppm rolling 3min average

Glossary and Abbreviations

CBMS Community Based Monitoring Station, Tumbalong Park, Darling Harbour.
ER1 Elevated Receptor No. 1; Millenium Towers, Sydney
ER2 Elevated Receptor No. 2; 51 Druitt St, Sydney.
MAP Mary-Ann Street Park, Ultimo.
CO Carbon monoxide
NO Nitric oxide
NO2 Nitrogen dioxide
NOX Oxides of nitrogen
µg/m3 micrograms per cubic metre
mg/m3 milligrams per cubic metre
ppm parts per million
pphm parts per hundred million
ppmm parts per million minutes
deg degree
PM2.5 particulate matter with equivalent aerodynamic diameter less than 2.5µm
PM10 particulate matter with equivalent aerodynamic diameter less than 10µm
TEOM PM10 and PM2.5 air monitoring equipment
DEC Department of Environment and Conservation (formerly New South Wales Environment Protection Authority)
RTA Roads and Traffic Authority of New South Wales
NEPM National Environment Protection Measure
DIPNR Department of Infrastructure, Planning and Natural Resources (formerly known as PlanningNSW)
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