Merriwa air quality monitoring station is located on Merriwa Scone Road approximately 8 km north-east from Merriwa, at the north-western end of the Upper Hunter valley. It is one of two Upper Hunter stations designated as a background site for fine particles.
| Air quality monitoring region | Upper Hunter |
| Commissioned | February 2012 |
| Latitude | -32.12665 |
| Longitude | 150.45824 |
| Elevation | 406 metres |
Data collected
The following air pollutants and meteorological variables are measured at Merriwa:
- Fine particles as PM10
- Fine particles as PM2.5
- Carbon monoxide (CO)
- Oxides of nitrogen (NO, NO2 and NOx)
- Ozone (O3)
- Sulfur dioxide (SO2)
- Visibility using nephelometry
- Ambient temperature
- Precipitation
- Relative humidity
- Wind speed, wind direction and sigma theta