Heat stress now falls under the Physical Agents Regulations, 2024. Here is how it is measured, what the 27 °C WBGT action level and 30 °C limit mean, how clothing changes the result, and when a survey is required.

The Environmental Regulations for Workplaces fell away on 6 September 2026. Here is what the Physical Agents Regulations, 2024 require for heat, cold, lighting, indoor air quality, vibration and radiation, including the Table 1 limits and who may do the monitoring.