How many sampling points are needed to get a good coverage on any area? For example one pump to cover a multi-level building will not give a representative result, whereas multiple samples in a small space will not provide any more information than a single sample.At the same time however, we need to ensure that the sampling location will not interfere with the general daily activities. In this situation, the sampling locations are to be chosen to best represent the air that the people working or living in the area will be exposed to. The main reasons are as outlined below (there are no doubt many more and these will also need to be considered): Occupational monitoring When choosing the location to sample consideration needs to be made as to why we are sampling. Our noses come out of our heads at about that angle, and we are trying to replicate that.It is also important that the filter is located at approximately a 45 0 angle. One way of achieving this is by attaching the filter head to a stake of known height. When choosing the location ensure that the filter head is kept within the breathing zone. Static sampling, this can be achieved by placing the pump in a fixed location normally about 1m away from any wall or surface.Attach it to one of the workers, this is generally achieved by attaching a filter head to the lapel of the worker.It is important that we sample the air that people are likely to breathe, and most of this air is generally located between 1m and 2m off the ground. What are we sampling for? What we are sampling for will determine what type of sampling filter head is chosen.
Why are you sampling? We need to be honest about the reason for the sampling, this will assist in designing the sampling regime to ensure the results will match expectations.However, prior to undertaking any air sampling there are two very basic questions that must be answered. As this is a scientific process we need to ensure that we can as much as possible have confidence in our results. The aim in undertaking air sampling is to get a realistic sample of the air that people are breathing. Posted by Luke Austin on 25 August 2017 | 0 Comments Air monitoring, where do you place the pumps?
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