With OSHA's proposed heat rule unfinished but enforcement expanding, the metric an employer chooses to trigger protective action — Heat Index or wet bulb globe temperature — may matter more than the regulation itself.

On July 26, 2026, Las Vegas reached 111°F while Orlando topped out at 97°F — and by Heat Index, both cities sounded the same alarm. Ask which workforce faced the greater heat danger that afternoon, and the honest answer depends on which metric you consult. That ambiguity sits at the center of the decision facing every safety leader today: the federal heat standard remains unfinished and its future uncertain, yet OSHA is inspecting for heat hazards more actively than at any point in its history.

The regulatory arc began on October 27, 2021, when OSHA published an Advance Notice of Proposed Rulemaking for Heat Injury and Illness Prevention in Outdoor and Indoor Work Settings (86 Fed. Reg. 59309). On August 30, 2024, the agency published the proposed standard (89 Fed. Reg. 70698), covering general industry, construction, maritime and agriculture. Public comments closed in January 2025; hearings and post-hearing comments concluded on October 30, 2025.

But the path forward remains genuinely uncertain. Legislation introduced in the House in November 2025 (H.R. 6213) would prohibit finalizing or enforcing the proposed standard or any substantially similar one, and it advanced out of committee in July 2026. The Department of Labor's current regulatory agenda projects a supplemental proposal by late 2026 and a final standard in late 2027.

Enforcement, however, is not waiting. On April 10, 2026, OSHA issued a revised National Emphasis Program for outdoor and indoor heat-related hazards, effective immediately for five years, through April 2031. Heat inspections have grown from roughly 200 to about 2,400 per year — approximately 6 percent of all federal OSHA inspections. Under the revised program, inspectors may expand any inspection when heat hazards are evident on heat-priority days and may open heat-focused inspections whenever the National Weather Service issues a heat advisory or warning. The revision also strengthens citation guidance with reorganized appendices for evaluating heat programs.

Hence the dilemma: with no final rule there is no single compliance checklist, yet heat remains fully enforceable today under the OSH Act's General Duty Clause, and the emphasis program materially raises the odds of an inspection. Employers must choose their own guidance — starting with the most consequential choice of all: Heat Index or WBGT.

This article originally appeared in the October 2026 issue of Occupational Health & Safety.

• Novara

  All in One Safety Software

  Novara's unified EHS and risk management platform gives your team the data, insights, and configurable tools to manage safety by design — not reaction.
  See how Novara works → Novara.com

• Friday New Product Roundup: October 16

  This week's products include cut-resistant apparel, carbon-toe work boots, pallet rack repair kits, an automated compressed air control and a weatherproof cable enclosure. Read Now

• Workplace Noise Can Affect More Than Your Hearing

  Long-term exposure to hazardous noise can affect worker safety, overall health and quality of life, making consistent hearing protection essential. Read Now

• Why Hands-On Training Still Matters in a Digital Age

  VR, AR and AI can expand training opportunities, but physical practice remains essential when workers must handle equipment, coordinate with teams and perform correctly in high-risk situations. Read Now

• The Heat Stress Standard and the Employer's Decision Dilemma

  With OSHA's proposed heat rule unfinished but enforcement expanding, the metric an employer chooses to trigger protective action — Heat Index or wet bulb globe temperature — may matter more than the regulation itself. Read Now

• Navigating Electrical Safety’s Gray Areas

  Electrical safety standards provide a framework, but real-world work doesn't always offer clear-cut choices. Five common gray areas show why understanding the hazard, the task and the worker’s qualifications matter when the right decision is not immediately obvious. Read Now

• The Keys to a Successful Smart PPE Rollout

  A rushed rollout produces resistance. A focused pilot and transparency on goals produce a program workers trust. Read Now

Most   Popular

• Why Hands-On Training Still Matters in a Digital Age

  VR, AR and AI can expand training opportunities, but physical practice remains essential when workers must handle equipment, coordinate with teams and perform correctly in high-risk situations.

• Survey Links Unverified AI Guidance to Higher Regulatory Fines

  Respondents linked unchecked AI output to incorrect filings, missed deadlines and failed audits, and teams that put sensitive data into personal AI tools reported problems far more often.

• ASSP Survey Finds AI Adoption Growing in Workplace Safety

  AI use in workplace safety is growing, but investment, data quality and organizational challenges remain barriers.

• Firefighter Health and Safety Technology Guide Research Collaboration

  International working groups will examine occupational health risks, smart protective equipment and oversight of AI tools.

• Data Center Construction Raises Confined Space Safety Considerations

  Electrical and mechanical spaces on rapidly expanding data center projects can present access, ventilation and rescue challenges that require careful hazard evaluation.

More AI Coverage

Please type the letters/numbers you see above.

• VAC-U-MAX, Fauske & Associates, LLC, Donaldson, EMSL Analytical, Inc.

  Where Dust Explosions Start: Equipment-Level Hazards & How to Control Them (Part 2) Oct 15, 2026

• PIP Global Safety

  The Next Generation of Head Protection and Connected PPE Oct 20, 2026

• J. J. Keller & Associates Inc.

  OSHA Training for General Industry: Key Training Elements of The Most Common Safety Topics Oct 21, 2026

• FacilityOS, Industrial Scientific Corp.

  Facility Safety Summit Oct 22, 2026

• FacilityOS, Industrial Scientific Corp.

  Facility Safety Summit Session 1: Three Standards Updates That Could Impact Your Facility Safety Program Oct 22, 2026

• FacilityOS, Industrial Scientific Corp.

  Facility Safety Summit Session 2: Facility Disaster & Emergency Preparedness Oct 22, 2026

All Webinars