Surface preparation tasks—grinding, scabbling, shot blasting—produce short, intense dust bursts that drive exposure. Average figures can look acceptable while brief peaks push real risk. Structured monitoring helps you see the spikes and act before they become a habit.

Pick the right monitoring approach

Use direct-reading particulate instruments to track PM10, PM2.5 and, where available, PM1. Choose personal monitoring for worker exposure trends and area monitors to manage zones. Keep it simple: stable placement, protected from splash and vibration, and log intervals short enough to capture task spikes.

Plan where and when to measure

Baseline with an empty run to learn background. During tasks, log at 1–10 second intervals and note start/stop times, tools used, and controls active (LEV on/off, water suppression, doors open). Position area sensors downwind of the operator’s breathing zone and away from corners where air can stagnate.

Define triggers and actions

Set internal alert levels that reflect the risk of the dust present; for RCS, remember the WEL is 0.1 mg/m³ as an 8-hour TWA. Use the monitor to flag peaks and respond immediately: check hood position, lower cutting speed, add water suppression, improve containment, or increase air filtration. Air monitoring data can also guide when to boost air scrubber output or change loaded filters.

Verify improvements

Repeat the same task after adjustments and compare the peak profile—lower amplitude and shorter duration shows progress. Save a simple chart with notes for your COSHH records and toolbox talks.

Practical takeaways

• Use direct-reading PM monitors for short-interval logging.
• Record task context so peaks can be traced to causes.
• Set clear triggers tied to dust type and respond in real time.
• Re-test after changes to prove control and brief the team.

Monitoring is not paperwork—it is a feedback loop. Catch the peaks, correct them quickly, and your average exposure and clean-up burden will fall together.