Studies of the effect of humidity and other factors on some different filter materials used for gravimetric measurements of ambient particulate matter

摘要

The results from studies of the effects of several factors on the accurate measurement of particulate matter (PM) mass collected on ambient air monitoring filters are described. The main investigation quantifies the effect of humidity on the mass of blank filters of some commonly used materials in Europe, namely quartz fibre, glass fibre and PTFE-bonded glass fibre. Supplementary work investigates the effect of humidity on the mass of sampled PM, and effects of storage and transport are also reported.