Particle concentration is the number or mass of airborne particles in a defined volume of air, often reported using a unit such as particles per cubic metre. The measurement describes how much particulate matter is present; it does not, by itself, identify the particles or determine whether exposure is harmful.
In workshops, monitoring concentration can reveal changes that are not visible or detectable by smell. Readings can help assess whether ventilation is reducing or removing airborne particles and whether conditions are rising over time. Sensors and sampling methods vary in what particle sizes they detect, so results should be interpreted in context. Measurement supports risk management, but does not replace suitable ventilation, exposure controls, or health and safety guidance.