Dust and fume control lives or dies on data. Without measurement you cannot prove capture, tune airflow, or decide when to service filters. Simple monitoring turns guesswork into decisions you can defend under COSHH.

What to measure and why

For welding and similar processes, focus on fine particulate (PM2.5 and PM1) since it stays airborne longest and drives exposure. Track background levels at start-up, during work, and after you stop. Record activities, not just numbers, so spikes make sense later.

How to measure on a live site

• Use a particulate monitor to log PM near workstations and at a background location. Keep it away from direct plumes.
• Do a quick smoke test to visualise capture at hoods and adjust positioning.
• Check airflow under load on LEV and compare to your maintenance limits.
• Repeat after any process change, filter change, or layout move.

Turn readings into actions

Set trigger levels that prompt checks: a rise in background PM might mean clogged filters, poorly positioned hoods, or insufficient ambient control. If PM does not return to baseline within a set time after welding stops, add or reposition air scrubbers, or review make-up air.

Keep it practical and compliant

Store readings with job notes and maintenance records; this supports COSHH and internal audits. If you deal with specific substances with a Workplace Exposure Limit (e.g., RCS at 0.1 mg/m³), link your controls and observations to those limits. For welding fume, treat as a carcinogen and aim for demonstrably low background concentrations rather than chasing a single WEL.

Practical takeaways

• Measure PM2.5/PM1 at workstations and a background reference.
• Use smoke to prove hood capture and adjust in real time.
• Track airflow under load and change filters before performance drops.
• Set trigger levels and document findings alongside COSHH records.

Incorporating monitoring is straightforward and low cost. A compact MAXVAC particulate monitor can give instant feedback, helping teams tune extraction, plan maintenance, and keep exposure consistently low.