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Index Banded Annual Totals for Swansea:
LOW
125 days
MODERATE
93 days
HIGH
1 day
VERY HIGH
5 days

Exceedences

Nitrogen Dioxide Exceedences
Total period : 06/08/2020 04:00 - 13/08/2020 04:00
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 10.74 26.45 25.61
Max 28.50 66.27 74.05
Sdv 0.46 1.05 0.85
Geom. mean 9.56 22.77 23.47
Exceedance Limit 105.00 105.00 105.00 200.00 200.00
Exceedance (%) 0.00 0.00 0.00 0.00 0.00
Exceedance Count 0 0 0 0 0
Exceedance (Hours) 0.00 0.00 0.00 0.00 0.00
Date of max 11/08/2020 12/08/2020 11/08/2020
Time of max 21:00:00 09:00:00 19:00:00
Perc:99.8 % 28.50 66.27 74.05


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



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