Costa Rica Decreto Ejecutivo No. 39147-S-TSS occupational thermal stress prevention rule. Four-level heat-index classification with escalation for heavy work, sun exposure, and non-breathable PPE.
No standalone formula is published for this standard; see programmable logic and parameters below.
Governing metric: Heat index (°F) — derived from air temperature and relative humidity if not directly measured
Programmable logic: Four tiers by heat index: Level I <91°F (60/0 baseline); Level II 91–102°F (50/10 shade required); Level III 103–124°F (30/30 active hydration); Level IV ≥125°F (stopWork, heat stroke risk). Heavy workload or non-breathable PPE escalates one level. Designed to prevent ERCnt (Mesoamerican Nephropathy) in agricultural regions.
This standard does not take WBGT as a required input, and publishes no standalone numeric parameter table here; see the governing metric and programmable logic above, and the primary source below.
Required inputs: none
Optional inputs: heatIndexC, heatIndexF, airTempC, relativeHumidity, workload, ppe