I approached a couple of employees just before start of their shift and asked if one of them would volunteer to wear an air sampling pump. One employee responded, “If you tell me who you voted for president, I might wear the pump.” I knew at that point that I’d get some honest results from industrial hygiene (IH) sampling.
Experienced IHs will confirm that employees may greatly influence air sample results to make the results abnormally good or bad. This is especially true when conducting employee air sampling in environments such as manufacturing or construction for chemicals with a low eight-hour TWA exposure limit, such as manganese fume with a 0.02 mg/m3 TLV.