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Index Banded Annual Totals for Swansea:
98 days
88 days
2 days
13 days

Morriston Groundhog monitoring station

Morriston Groundhog monitoring station
Running Annual Total for Morriston Groundhog:

249 days
1 day
0 days
0 days


Morriston Groundhog
Wychtree Street


OS Grid Reference: OS Reference: Easting 267213 - Northing 197678
Longitude / Latitude: Latitude: 51 39' 70

Site Description

The Morriston Groundhog has been operational since September 2000 and is located adjacent to the southbound slip road to the busy A4067 dual carriageway at Morriston Underpass. The Hafod AQMA boundary is approximately one mile south of this location. The station can be seen to the right of the picture (below the Aldi sign). Receptor locations can be found to the right of the photo taking the form of terraced housing. To the left of the picture and just out of frame is Morriston Primary School. The school buildings abut the red brick retaining wall that can be seen to the northbound Morriston slip road exit. The A4067 carries on for approximately one mile northbound where it meets the M4 motorway at junction 45.

All equipment is housed within an air-conditioned unit and operates continuously. The equipment comprises of API real-time analysers measuring CO, SO2, O3, H2S and NOx, with a Thermo FDMS unit measuring PM10.The analysers have been configured so that a daily automatic calibration is carried out (between 00:30 hours and 01:00 hours). This calibration data is automatically logged as invalid by the data-loggers. In addition officers from this authority perform routine fortnightly manual calibrations. The analysers are subjected to scrubbed air via a zero air generator to assess the analysers response. They are also subjected to traceable calibration gases and the response of the analyser and data-logger is recorded. All manual calibration data is recorded as invalid data by the data-loggers and is removed from any subsequent analysis and data upload to these pages .

The station is operated and calibrated in accordance with the UK National Network Local Site Operators manual. Data is re-scaled according to the calibration factors obtained on a fortnightly basis. The station is serviced and maintained twice yearly by Enviro Technology Services Ltd.  The span gas calibration cylinders are replaced on a regular basis and are to a certified and traceable standard.

Air Quality parameters measured

  • NOx
  • NO
  • NO2
  • O3
  • PM2.5

Meteorological parameters measured

  • Air Temperature
  • Wind Direction
  • Wind Speed