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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 (986 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

NO2 Diffusion Tube sites
in 2016

2014 2015 2016

Nitrogen dioxide

Date NO2 Units
06/01/2016  19 ugm-3
03/02/2016  18* ugm-3
02/03/2016  20* ugm-3
30/03/2016  22* ugm-3
27/04/2016  20* ugm-3
25/05/2016  16* ugm-3
29/06/2016  13* ugm-3
27/07/2016  17* ugm-3
24/08/2016  12* ugm-3
28/09/2016  14* ugm-3
26/10/2016  18* ugm-3

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

Use the buttons above to view data for years between 2014 and 2016

Further data and graphs may be downloaded here.

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