How is isocyanate exposure measured in the workplace?

Measuring isocyanate exposure typically involves air monitoring during work activities. This is usually done by attaching a small sampling device near the worker’s breathing zone — often clipped to a lapel or collar. The device collects airborne isocyanates while the person goes about their normal work.

In some cases, surface or wipe sampling is used to check for contamination on work areas, tools, or PPE. Urine testing might also be used to check for biological markers of exposure, though this depends on the compound and type of work.

Because isocyanates are reactive and can degrade quickly, samples must be handled carefully and analysed by a specialist lab. Most workplace monitoring is done over a short period — for example, a 15-minute "task-based" sample — to check against short-term exposure limits.

Getting this right takes proper timing, techniques, and equipment. A good monitoring strategy should capture both peak exposure and average conditions.