Air monitoring is the quickest way to prove your dust controls work and to stay audit-ready. Done well, it links exposure, controls, and actions into a clear record that supports COSHH assessments and HSE expectations.

What to measure and why

Use particulate readings to track PM10, PM2.5 and ideally PM1 alongside task notes. For respirable crystalline silica (RCS), the UK Workplace Exposure Limit is 0.1 mg/m3 (8-hr TWA). Real-time particulate meters show trends and hotspots; formal personal sampling confirms exposures when needed. Choose air monitoring equipment that logs time-stamped data you can export.

Build an audit-ready plan

When to monitor

• Baseline before work starts.
• During high-risk tasks (cutting, chasing, grinding, sweeping).
• After control changes (new extraction, extra housekeeping).

Where to monitor

• Breathing zone or near-worker fixed location for task trend data.
• Far-field to understand site background.
• Near intakes/doorways to check migration to clean areas.

Record placement, height, and distance from the task. Use simple markers (smoke pencil or tissue) to confirm airflow direction so readings make sense.

Make the data usable

• Time-sync meters with site diaries. Tag events (start/stop cutting, housekeeping).
• Set action levels. For example, if PM trends rise during a task, pause and improve capture at source or add air filtration.
• Export graphs and keep with COSHH documentation. Note what you changed and the effect on readings.

Common pitfalls

• Short, unrepresentative samples. Aim for whole-task windows and compare like with like.
• No calibration or zero checks. Keep certificates and routine function checks.
• Monitors placed in dead air or outside the airflow path, hiding real exposure.

Use the results to drive controls

Let the 3-layer approach guide actions. If peaks occur during cutting, improve capture at source (tool extraction or water). If background stays high, add air scrubbers or negative air and verify airflow under load, not free-air. If spikes follow housekeeping, replace dry sweeping with industrial vacuuming.

Practical takeaways

• Plan who, what, where, and when before switching monitors on.
• Log tasks and controls so data tells a story an auditor can follow.
• Set action triggers and record the corrective step and the post-change result.
• Store reports with COSHH records to demonstrate ongoing control.

Consistent, simple monitoring turns dust control from opinion into evidence. It also helps crews see what works in real time and builds a reliable compliance trail.