St Marys air quality monitoring station is located on residential property off Mamre Road, St Marys. It is situated in the centre of the Hawkesbury basin in a semi-rural area.
| Air quality monitoring region | North West Sydney |
| Commissioned | October 1992 |
| Latitude | -33.79512 |
| Longitude | 150.76677 |
| Elevation | 29 metres |
Data collected
The following air pollutants and meteorological variables are currently measured at St. Marys:
- Fine particles as PM10
- Fine particles as PM2.5
- Oxides of nitrogen (NO, NO2 and NOx)
- Ozone (O3)
- Visibility using nephelometry
- Ambient temperature
- Relative humidity
- Wind speed, wind direction and sigma theta