LAQN Monitoring Statistics




Achieved Achieved but raised Exceeded No Data Closed
Achieved Achieved but raised Execeeded No Data Closed
What are the AQS Objectives?
Your selected monitoring site » Westminster - Marylebone Road
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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. 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 22
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 20
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 NO 60
Nitrogen Dioxide 40 ug/m3 as an annual mean NO 94
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 results are excluded where analysers have not returned valid data for at least 90% of the year, unless a short-term objective was exceeded.
* Note - all results from TEOM PM10 analysers from 2004 onward are now converted to reference equivalence using the volatile correction method. Results using the old 'TEOM*1.3' method are also shown for comparison where relevant. More information.
* Note that this information is calculated twice daily, so may not reflect the latest data.
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