Bias: In respirable dust measurements, the bias in a sample is calculated relative to the appropriate
respirable dust convention. The theory for calculating bias was developed by Bartley and Breuer
[10]. For this method, the bias, therefore, depends on the international convention for respirable
dust, the cyclones’ penetration curves, and the size distribution of the ambient dust. Based on
measured penetration curves for non-pulsating flow [1], the bias in this method is shown in Figure 1.