The challenge

Heat stress is consistently underestimated when organisations rely solely on air temperature. In reality, humidity, solar radiation, and low airflow can significantly increase physiological strain — sometimes without obvious warning signs. Without continuous, location-specific WBGT data, it's difficult to identify unsafe conditions in real time, adjust work schedules proactively, or demonstrate that appropriate measures were taken to protect workers during extreme heat events.

The Persium approach

Persium measures the full set of environmental parameters needed to calculate WBGT — temperature, humidity, radiant heat, and wind — providing real-time heat stress insight across worksites and public spaces. Data is visualised through intuitive dashboards with configurable alerts, helping teams respond quickly when conditions approach unsafe thresholds. Time-stamped, exportable records support risk assessments, operational decisions, and health & safety reporting.

What organisations use it for

Outdoor worker protection — monitor heat stress conditions for construction, mining, utilities, logistics, and transport workers to guide safe work-rest cycles.

High-exertion activity management — identify periods of elevated heat risk to support safer planning for physically demanding tasks.

Extreme heat event response — real-time site-level insight during heatwaves to support operational decisions and public safety measures.

Health & safety compliance — generate defensible WBGT records to support audits, incident investigations, and regulatory reporting.