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Index Banded Annual Totals for Swansea:
LOW
63 days
MODERATE
50 days
HIGH
0 days
VERY HIGH
3 days

Exceedences

Nitrogen Dioxide Exceedences
Total period : 26/04/2017 20:00 - 26/04/2018 20:00
Integration time : 1.0 Hours, Observation limit :1
  Swansea AURN Morriston Morfa Hafod DOAS St Thomas DOAS
  [ppb] [ppb] [ppb] [ug/m3] [ug/m3]
Mean 11.37 11.47 36.58 29.85
Max 61.68 44.06 251.78 134.99
Sdv 0.10 0.19 0.29 0.20
Geom. mean 7.74 10.11 27.54 24.04
Exceedance Limit 105.00 105.00 105.00 200.00 200.00
Exceedance (%) 0.00 0.00 0.00 0.01 0.00
Exceedance Count 0 0 0 1 0
Exceedance (Hours) 0.00 0.00 0.00 1.00 0.00
Date of max 19/01/2018 11/05/2017 01/05/2017 18/12/2017
Time of max 08:00:00 06:00:00 05:00:00 16:00:00
Perc:99.8 % 51.86 43.77 141.65 102.59


All data supplied are non-validated and for information only.



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