Statistical Tools » Air Quality Objectives

Air Quality Strategy Objectives Generated for the 12 month period commencing » 1-jan-2012

Pollutant Objective Result Achieved
Objective
Site selected » Brent - Neasden Lane
Nitrogen Dioxide 200 ug/m3 as a 1 hour mean, not to be exceeded more than 18 times a year 0 YES
Nitrogen Dioxide 40 ug/m3 as an annual mean 44 NO
PM10 (redundant method) 40 ug/m3 as an annual mean 43 NO
PM10 (redundant method) 50 ug/m3 as a 24 hour mean, not to be exceeded more than 35 times a year 121 NO
PM10 Particulate 40 ug/m3 as an annual mean 33 YES
PM10 Particulate 50 ug/m3 as a 24 hour mean, not to be exceeded more than 35 times a year 57 NO
Site selected » City of London - Upper Thames Street
PM10 (redundant method) 40 ug/m3 as an annual mean 38 YES
PM10 (redundant method) 50 ug/m3 as a 24 hour mean, not to be exceeded more than 35 times a year 51 NO
PM10 Particulate 40 ug/m3 as an annual mean 34 YES
PM10 Particulate 50 ug/m3 as a 24 hour mean, not to be exceeded more than 35 times a year 43 NO
Site selected » Westminster - Marylebone Road
Carbon Monoxide 10 mg/m3 as a maximum daily running 8 hour mean 0 YES
Nitrogen Dioxide 200 ug/m3 as a 1 hour mean, not to be exceeded more than 18 times a year 122 NO
Nitrogen Dioxide 40 ug/m3 as an annual mean 94 NO
Ozone 100 ug/m3 as an 8 hour mean, not to be exceeded more than 10 times a year 0 YES
PM10 (redundant method) 40 ug/m3 as an annual mean 42 NO
PM10 (redundant method) 50 ug/m3 as a 24 hour mean, not to be exceeded more than 35 times a year 89 NO
PM10 Particulate 40 ug/m3 as an annual mean 38 YES
PM10 Particulate 50 ug/m3 as a 24 hour mean, not to be exceeded more than 35 times a year 48 NO
Sulphur Dioxide 125 ug/m3 as a 24 hour mean, not to be exceeded more than 3 times a year 0 YES
Sulphur Dioxide 266 ug/m3 as a 15 minute mean, not to be exceeded more than 35 times a year 0 YES
Sulphur Dioxide 350 ug/m3 as a 1 hour mean, not to be exceeded more than 24 times a year 0 YES
Site selected » Westminster - Marylebone Road FDMS
PM10 Particulate 40 ug/m3 as an annual mean 31 YES
PM10 Particulate 50 ug/m3 as a 24 hour mean, not to be exceeded more than 35 times a year 23 YES
Warning: Westminster - Marylebone Road FDMS - PM10 Particulate achieved a capture rate less than 90% for the year (85%). Results may not be representative of the full year and should be used for guidance only.
Note 1: All results from TEOM PM10 analysers from 2004 onward are now converted to reference equiavlence using the volatile correction method. Results using the old 'TEOM*1.3' method are also shown in grey for comparison where relevant. More information.

Note 2: Ratification information is shown below. Results based on provisional data must be considered with care. Why?
Warning: Brent - Neasden Lane - All data fully ratified
Warning: City of London - Upper Thames Street - All data fully ratified
Warning: Westminster - Marylebone Road - Warning: Calculation included provisional data. Data after 01 Jan 2012 have not been fully ratified.
Warning: Westminster - Marylebone Road FDMS - All data fully ratified
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