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Index Banded Annual Totals for Swansea:
LOW
15 days
MODERATE
8 days
HIGH
0 days
VERY HIGH
0 days

Exceedences

Nitrogen Dioxide Exceedences
Total period : 23/01/2017 21:00 - 23/01/2018 21:00
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 11.36 16.16 37.59 30.14
Max 61.68 92.77 251.78 135.74
Sdv 0.10 0.17 0.31 0.20
Geom. mean 7.63 13.76 27.90 24.43
Exceedance Limit 105.00 105.00 105.00 200.00 200.00
Exceedance (%) 0.00 0.00 0.00 0.02 0.00
Exceedance Count 0 0 0 2 0
Exceedance (Hours) 0.00 0.00 0.00 2.00 0.00
Date of max 19/01/2018 07/02/2017 01/05/2017 31/01/2017
Time of max 08:00:00 08:00:00 05:00:00 17:00:00
Perc:99.8 % 52.25 66.97 152.53 103.97


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



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