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Index Banded Annual Totals for Swansea:
LOW
254 days
MODERATE
65 days
HIGH
4 days
VERY HIGH
1 day

Exceedences

Nitrogen Dioxide Exceedences
Total period : 20/11/2016 20:00 - 20/11/2017 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 12.81 19.28 42.34 31.71
Max 85.73 92.77 261.50 137.90
Sdv 0.12 0.18 0.34 0.21
Geom. mean 8.58 15.96 31.14 25.92
Exceedance Limit 105.00 105.00 105.00 200.00 200.00
Exceedance (%) 0.00 0.00 0.00 0.07 0.00
Exceedance Count 0 0 0 6 0
Exceedance (Hours) 0.00 0.00 0.00 6.00 0.00
Date of max 01/12/2016 07/02/2017 30/11/2016 01/12/2016
Time of max 17:00:00 08:00:00 17:00:00 18:00:00
Perc:99.8 % 61.70 73.91 176.96 112.57


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



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