Abstract—Thephysiologicalandactivitystrainindex(PASI)has beendevelopedtoimprovetheonlinedecisionsupportforworkers exposed to heat stress. Fire fighters (smoke divers) which are exposedtobothheat-stressandhigh-risksituationshavebeenusedas test case. PASI combines a modified version of the relatively wellknown physiological strain index (PSI) with activity data from accelerometers. The algori…