Proposed US federal heat rule for outdoor and indoor work settings (29 CFR 1910.148 NPRM). Not final — rulemaking paused by Trump administration regulatory freeze (Jan 2025). OSHA's NEP (updated Apr 2026) is the current federal enforcement vehicle.
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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
Initial trigger at 80°F heat index or NIOSH RAL; high trigger at 90°F heat index or NIOSH REL.
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: heatIndexF, wbgtC, metabolicRateW, acclimatization, workerStatus
This standard was added to the calculator.
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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.