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Index Banded Annual Totals for Swansea:
LOW
72 days
MODERATE
26 days
HIGH
4 days
VERY HIGH
7 days

Exceedences

Nitrogen Dioxide Exceedences
Total period : 12/04/2021 14:00 - 19/04/2021 14:00
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 14.03 24.19 47.57
Max 35.71 97.81 105.85
Sdv 0.46 2.31 1.81
Geom. mean 12.93 23.75 42.01
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 15/04/2021 13/04/2021 19/04/2021
Time of max 20:00:00 07:00:00 02:00:00
Perc:99.8 % 35.71 97.81 105.85


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



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