Climate change and occupational heat stress: methods for assessment

Area of Science:

• Environmental Health
• Occupational Safety
• Climate Change Impacts

Background:

• Global warming exacerbates occupational heat stress, particularly in developing nations.
• Accurate measurement and assessment of heat stress are crucial for worker safety.
• Understanding heat stress impacts is vital for global health and productivity.

Purpose of the Study:

• To assess occupational heat stress using internationally recognized methodologies.
• To compare the effectiveness of two distinct heat stress assessment methods.
• To provide insights into reliable heat stress evaluation for diverse climatic conditions.

Main Methods:

• Comparison of Wet Bulb Globe Temperature (WBGT; ISO 7243) and Predicted Heat Strain (PHS; ISO 7933) methods.
• Evaluation of climatic factors relevant to heat stress measurement.
• Analysis of heat balance conditions and physiological strain predictions.

Main Results:

• The WBGT method provides a more conservative heat stress assessment, leading to shorter permissible working times.
• The PHS method, based on easily measurable climatic factors, offers a more rational evaluation of heat balance.
• Discrepancies between WBGT and PHS highlight different assessment philosophies.

Conclusions:

• The PHS method's physiological strain predictions align better with existing data from warmer climates.
• Both WBGT and PHS methods require further global validation for reliable heat stress information.
• Wider adoption and validation of PHS and WBGT are recommended for accurate occupational heat stress management.