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Index Banded Annual Totals for Swansea:
152 days
35 days
2 days
34 days

Diffusion Tubes - Nitrogen Dioxide (NO2)

Click on a diffusion tube location to see a graph of its data or click on an area of Swansea on the right hand menu.
Placing your mouse over a marker will give details of its location.


Red Marker - This site has exceeded the current EU objective level of 40 μg/m3 as an annual mean
Green Marker - This site is below the current EU objective levelof 40 μ/m3 as an annual mean
Grey Marker - This site is no longer in service, but there is historical data available