Basic Statistics » 2011 Annual Statistics for Croydon - George Street » Number of days in each Air Pollution Index band
Nitrogen Dioxide Bar Graph
  Index key
PM10 Particulate (by TEOM) Bar Graph
  Index key
Sulphur Dioxide Bar Graph
  Index key
Note 1: The results are based on the old air quality Index which was used before the 1st of January 2012.
Note 2: All results from TEOM PM10 analysers from 2004 onward are now converted to reference equiavlence using the volatile correction method.
Note 3: This information is calculated twice daily, so may not reflect the latest data.
Valid data capture rates for the year are shown below. Where less than 90% is achieved statistics should be used for guidance only:
Species Value
PM10 (not reference equiv.) (95%)
Nitrogen Dioxide (83%)
PM10 Particulate (95%)
Warning: Calculation included provisional data. Data after 10 May 2006 have not been fully ratified.
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