LAQN Monitoring Statistics




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Achieved Achieved but raised Exceeded No Data Closed
Achieved Achieved but raised Execeeded No Data Closed
Your selected monitoring site » Westminster - Marylebone Road
The table below shows whether pollution levels recorded at the site you have selected remained within the Government's Air Quality Strategy Objectives in 2014 (to date). For further basic statistics click on the button below, or for more precise statistics, use the Statistics Calculator.
Pollutant Objective Was it achieved? Value
Sulphur Dioxide 125 ug/m3 as a 24 hour mean, not to be exceeded more than 3 times a year YES 0
Sulphur Dioxide 266 ug/m3 as a 15 minute mean, not to be exceeded more than 35 times a year YES 0
Sulphur Dioxide 350 ug/m3 as a 1 hour mean, not to be exceeded more than 24 times a year YES 0
PM10 Particulate 40 ug/m3 as an annual mean YES 31
PM10 Particulate 50 ug/m3 as a 24 hour mean, not to be exceeded more than 35 times a year YES 17
PM10 (redundant method) 40 ug/m3 as an annual mean YES 35
PM10 (redundant method) 50 ug/m3 as a 24 hour mean, not to be exceeded more than 35 times a year YES 19
Ozone 100 ug/m3 as an 8 hour mean, not to be exceeded more than 10 times a year YES 0
Nitrogen Dioxide 200 ug/m3 as a 1 hour mean, not to be exceeded more than 18 times a year YES 9
Nitrogen Dioxide 40 ug/m3 as an annual mean NO 78
Carbon Monoxide 10 mg/m3 as a maximum daily running 8 hour mean YES 0
* Note that all objectives have been calculated using a method defined in 2013.
* Note that these results cover from the start of the year to now, and are still subject to change until the end of the year.
* Note - 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 for comparison where relevant. More information.
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