Air monitoring measures the quantity of airborne fibres in any given environment. There are a few different types of monitoring to suit different situations, some of which are outlined below. The methodology is roughly the same in each instance. A pump is connected to a filter head by tubing. The pump maintains a steady flow, pulling air through a filter mounted in the filter head. After a given period of time a certain volume of air can said to have been sampled. The filter is removed and examined for ‘respirable’ fibres under a microscope. The number of fibres counted and the volume of air sampled lead to the calculation of a concentration of airborne fibre – most often expressed as fibres per millilitres of air (f/ml).
A typical ‘sampling train’
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