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Index Banded Annual Totals for Swansea:
LOW
136 days
MODERATE
47 days
HIGH
6 days
VERY HIGH
16 days

Exceedences

Nitrogen Dioxide Exceedences
Total period : 17/07/2021 03:00 - 24/07/2021 03:00
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 10.98 32.82 32.42
Max 35.49 104.20 83.79
Sdv 0.38 1.58 1.45
Geom. mean 10.04 26.78 27.56
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 17/07/2021 17/07/2021 17/07/2021
Time of max 20:00:00 20:00:00 22:00:00
Perc:99.8 % 35.49 104.20 83.79


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



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