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Index Banded Annual Totals for Swansea:
LOW
99 days
MODERATE
19 days
HIGH
1 day
VERY HIGH
5 days

Diffusion Tubes - Nitrogen Dioxide (NO2)

 9 Dulais Road, Pontardulais - facade diffusion tube
2012
Jan 2012 30.20 µg/m3
Apr 2012 18.00 µg/m3
May 2012 17.10 µg/m3
Jun 2012 15.80 µg/m3
Jul 2012 12.80 µg/m3
Aug 2012 15.70 µg/m3
Average 2012 18.27 µg/m3