The measurement of the size range and number distribution of airborne particles related to automotive sources – a literature study
This report reviews the literature relating to particulate size measurement and the techniques suggested for different applications. Successful measurements have been made using cascade impactors, which give gravimetric analysis of sized fractions and electrical mobility techniques, which give number distributions of sized fractions. It is recommended that this approach be employed in the assessment of automotive particulate emissions. Because the subsequent fate of these emissions are subject to many complex and confounding factors, their measurement “at the tail-pipe” has only a tenuous relationship with air quality particulate inventories.