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This section of the website allows you to choose a type of monitoring site, and then details for individual sites. Once you have chosen a site, its location will appear on the map above.

Choose a different type of monitoring site:
Hydocarbon Diffusion Tube sitesHydocarbon Diffusion Tube sites (8 Sites)
NO2 Diffusion Tube sitesNO2 Diffusion Tube sites (1018 Sites)
O3 Diffusion Tube sitesO3 Diffusion Tube sites (6 Sites)
SO2 Diffusion Tube sitesSO2 Diffusion Tube sites (9 Sites)

Non-Automatic Monitoring Sites in Wales

Ystrad Mynach (Nat West)

NO2 Diffusion Tube sites
Ystrad Mynach (Nat West) in 2011

«« 2007 2008 2009 2010 2011 »»

Nitrogen dioxide

Date NO2 Units
05/01/2011  41 ugm-3
02/02/2011  33 ugm-3
02/03/2011  29 ugm-3

Ratification Status:
» Red* - Provisional
» Green - Ratified

Use the buttons above to view data for years between 2003 and 2011

Further data and graphs may be downloaded here.

For more information on this monitoring data please contact this local authority at