How many samples?

As I’ve discussed in a previous post, there are many factors which lead to a wide variation in exposure for workers carrying out the same job. One implication of this is that it is very dangerous to draw conclusions from one or two samples. But how many samples need to be taken to ensure thatContinue reading “How many samples?”

Some implications of exposure variability

In our last post we saw how inhalation exposures to hazardous in the workplace are highly variable. The spread of results from an air sampling survey is usually quite wide and will usually conform to a skewed log-normal distribution. This means that although there is a large spread of results the majority of exposures areContinue reading “Some implications of exposure variability”

Variability in exposure measurements

Whenever an occupational hygienist carries out an air sampling survey, either for a group of workers carrying out the same tasks in a similar way, or for the same individual worker carrying out the same job on different days, it’s inevitable that a range of results will be obtained.  However, although most people would probablyContinue reading “Variability in exposure measurements”