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Index Banded Annual Totals for Swansea:
LOW
109 days
MODERATE
10 days
HIGH
1 day
VERY HIGH
5 days

Diffusion Tubes - Nitrogen Dioxide (NO2)

 215 St Teilo Street, Pontardulais - facade diffusion tube
2012
Jan 2012 45.40 µg/m3
Apr 2012 33.30 µg/m3
May 2012 30.40 µg/m3
Jun 2012 22.70 µg/m3
Jul 2012 18.30 µg/m3
Aug 2012 20.30 µg/m3
Average 2012 28.40 µg/m3