Chepstow A48

Latest Data: Updated 21/11/2018 12:00 GMT

Parameter Index Band Concentration Period
PM10 2 LOW 21 µg/m3 (Ref.eq) 24 Hour mean
PM2.5 2 LOW 14 µg/m3 (BAM) 24 Hour mean
NO2 1 LOW 39 µg/m3 hourly mean
NOXasNO2 No Data 105 µg/m3 hourly mean
NO No Data 43 µg/m3 hourly mean

Note: Values are based on provisional data. Data are GMT hour ending.

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Parameter Parameter Name
NO Nitric Oxide
NO2 Nitrogen dioxide
NOXasNO2 Nitrogen oxides as nitrogen dioxide
GE10 Particulates < 10um (hourly measured)
PM25 Particulates < 2.5um (hourly measured)

Statistics for Chepstow A48

Site Name Chepstow A48
Site Type Roadside
Easting, Northing 353126, 193473
Latitude, Longitude 51.638094, -2.678731
OS Grid Ref ST531934
Address Hardwick Hill, Chepstow Monmouthshire
Site Comments Situated on inclined section of A48 to assess road traffic related air quality issues in the locality
Monitoring Network: Welsh Automatic Urban pollution Monitoring
Parameter Date Started Date Ended
Nitric Oxide 03/09/2004
Particulates < 2.5um (hourly measured) 09/02/2010
Volatile PM2.5 (Hourly measured) 09/02/2010 09/08/2018
Modelled Wind Direction 01/08/2010
Nitrogen dioxide 03/09/2004
Non-volatile PM10 (Hourly measured) 08/02/2010 09/08/2018
Particulates < 10um (hourly measured) 03/09/2004
Nitrogen oxides as nitrogen dioxide 03/09/2004
Volatile PM10 (Hourly measured) 08/02/2010 09/08/2018
Modelled Temperature 01/08/2010
Particulates < 10um (hourly measured) 03/09/2004
Non-volatile PM2.5 (Hourly measured) 09/02/2010 09/08/2018
Modelled Wind Speed 01/08/2010

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