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.
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This rule has no numeric trigger the calculator evaluates — it states duties and control measures rather than a threshold a reading can be checked against. Its measures are listed below.
No standalone formula is published for this standard; see programmable logic and parameters below.
Programmable logic
Four tiers by heat index: Level I <91°F; Level II 91–102°F (shade required); Level III 103–124°F (active hydration); Level IV ≥125°F (heat-stroke risk). Heavy workload or non-breathable PPE escalates one level. The decree mandates a work/rest schedule and hydration at Levels III–IV but no fixed minute ratios — the per-level work/rest minutes are an app-applied schedule, not text of the decree.
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
This standard was added to the calculator.
Get notified when Costa Rica Thermal Stress Prevention Rule (Decreto No. 39147-S-TSS) changes — threshold changes, scope and legal-status changes, additions and removals. Changes that permit more heat exposure than before are labelled as such.
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If a threshold, trigger, exemption, date or duty here disagrees with the governing text, tell us and point at the section. The form arrives with this standard already named, and a correction is checked against the same primary document it was encoded from.