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Comparative PM10 measurements in the Netherlands Part B: rural areas

Vergelijkende PM10-metingen in Nederland. deel B: landelijke omgeving

Synopsis

The PM10 concentrations in the National Air Quality Monitoring Network in the Netherlands are measured with FAG-Eberline 62 I-N beta-attenuation monitors. Previous measurements revealed this monitor to be underestimated with respect to the EU reference method for PM10. Since then, all measured PM10 concentrations have been multiplied by 1.33, a factor that to date has not been explained. The semi-volatile (ammonium) aerosol was thought to be an important factor. Three beta-dust monitors were investigated in addition to the Monitoring Network at the agricultural site of Biest-Houtakker. This site is close to several pig breeding farms stables, where high concentrations of ammonia and ammonium aerosol are expected to be present. Measurements were taken for February -May 1999. A Klein Filter Gerat KFG was operated as the PM10 reference monitor to study the influence of the settings of the monitor, such as the amount of filter changes and inlet temperature. At this site and at this time of the year (February-May 1999) The beta-dust monitors were found to underestimate the concentration by a factor 1.15 compared to 1.33 for the FAG-Eberline 62 I-N beta-attenuation monitors.
 

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