Closed Monitoring Sites

Monitoring sites may be closed for a number of reasons which are not recorded on a case-by-case basis here. These include:

  • Concentrations are consistently well below objectives so monitoring is no longer required at a particular location.
  • The overall statutory minimum number of monitoring sites is reduced due to general declining concentrations of some pollutants e.g. sulphur dioxide and carbon monoxide.
  • The site was only established for a short-term investigative study, e.g for an environmental impact assessment.

Historical data and statistics for closed monitoring sites can still be accessed by clicking the link even though they no longer report data for the real-time information services.

Closed site summary

Monitoring site Closed Date
Anglesey Brynteg [Closed] 31/12/2022
Anglesey Coastal Park [Closed] 27/11/2008
Anglesey Felin Cafnan [Closed] 29/04/2019
Anglesey Holyhead [Closed] 11/05/2010
Anglesey Llynfaes [Closed] 16/03/2022
Anglesey Penhesgyn [Closed] 01/11/2012
Anglesey Penhesgyn 2 [Closed] 05/08/2016
Anglesey Penhesgyn 3 [Closed] 03/04/2022
Anglesey Penlon [Closed] 11/04/2007
Anglesey Wylfa [Closed] 13/01/2014
Baglan [Closed] 30/12/2002
Bridgend Ewenny Cross Roundabout [Closed] 31/12/2011
Caerphilly [Closed] 09/06/2004
Caerphilly Ton-y-Felin Roadside [Closed] 04/05/2006
Caerphilly Town Centre [Closed] 18/11/2007
Cardiff Briardene [Closed] 16/05/2008
Cardiff East [Closed] 05/09/2002
Cwmbran [Closed] 07/08/2020
Ffestiniog Railway [Closed] 17/01/2012
Flintshire [Closed] 16/03/2004
Hafod-yr-ynys Roadside [Closed] 15/09/2023
Mold [Closed] 31/12/2013
Monmouth [Closed] 27/08/2004
Newport Malpas Depot [Closed] 31/10/2011
Pembroke Power Station [Closed] 31/12/2015
Pontardawe Swansea Road [Closed] 11/07/2016
Port Talbot [Closed] 24/07/2007
Port Talbot CO [Closed] 31/12/2006
Port Talbot Docks [Closed] 04/06/2018
Port Talbot Prince Street [Closed] 31/12/2013
Port Talbot Prince Street (FDMS only) [Closed] 31/12/2013
Port Talbot Talbot Road [Closed] 04/06/2018
Port Talbot Theodore Road [Closed] 04/06/2018
Powys Newtown [Closed] 25/05/2007
Rhondda-Cynon-Taf Nantgarw [Closed] 11/07/2016
Rhondda-Cynon-Taf Pontypridd [Closed] 12/07/2005
Rhondda-Cynon-Taf Tylorstown [Closed] 30/04/2009
Swansea [Closed] 07/08/2006
Swansea Morfa Roadside [Closed] 12/05/2011
Twynyrodyn [Closed] 02/07/2019
V Glamorgan Dinas Powys Roadside [Closed] 03/02/2016
V Glamorgan Fonmon [Closed] 05/06/2014
V Glamorgan Penarth [Closed] 09/10/2012
V Glamorgan Windsor Road Penarth [Closed] 04/01/2021
Wrexham Isycoed [Closed] 31/12/2015