DustDisc samples are currently measured for ‘settlement’ AAC% and EAC%. As with the directional samples this is reported as the total for the sampling interval and the daily rate.

 

The expression ‘nuisance dust’ relates to dust settlement, although it is   generated by dust in flux. The effect caused by dust nuisance is often  measured as EAC% (Effective Area Coverage) and there are ‘custom and practice’ nuisance criteria for EAC.

 

Therefore the DustDisc will offer dust settlement monitoring with the same criteria as established for flux monitoring. The settlement data may be used in conjunction with the directional data – for example by considering different AAC (Absolute Area Coverage) to EAC ratios to assess the significance of dust from different directions.

 

Samples can also be assessed using Beaman and Kingsbury, 1981 criteria (0.5% EAC/day is considered to lead to “possible complaints”; 2.0% EAC/day to lead to “probable complaints” and 5.0% EAC/day may lead to “serious complaints”.

 

New sticky pads are currently being developed to provide samples for gravimetric (mass) and other analyses. Meanwhile, dust mass settlement rate can be calculated using the approximation method developed by Beaman and Kingsbury (1984).