How is personal exposure monitoring different from static area sampling?

Personal exposure monitoring measures what an individual worker actually inhales during their shift. A small sampling pump is clipped to the worker’s belt, with tubing positioned near their breathing zone — essentially, the air around their nose and mouth. This provides a realistic picture of exposure.

Static area sampling, by contrast, measures air quality in a fixed location — such as a workshop corner or near a process. While useful for identifying general background levels or checking ventilation performance, it doesn’t always reflect what the worker is breathing.

For compliance with Workplace Exposure Limits, personal sampling is usually the preferred method because exposure limits apply to the individual, not the room.

In practice, both methods have their place. But if you want to know whether a welder is overexposed, personal monitoring is the more reliable approach.