In order to address the heat stress hazard, the worker health surveillance makes a difference by providing information about individual factor, feedback, and evidence about efficacy of preventive measures and activities carried out through the risk assessment process, at individual and group levels. Every technical, procedural, or organizational measures could be ineffective without taking into account the results provided by health surveillance.
Keywords: Health surveillance; Heat stress–related illness; Occupational physicians; Outdoor workers; Risk assessment process.