Why It Matters

A new Congressional Research Service report underscores an escalating threat to American health, infrastructure, and agriculture, even as the federal government's ability to respond deteriorates. News sources have reported staff and program cuts at the National Integrated Heat Health Information System (NIHHIS), and Occupational Safety and Health Administration (OSHA) currently has no specific heat exposure standards.

The report arrives as lawmakers confront mounting evidence that heat-related risks are intensifying faster than policy responses can keep pace. Two competing visions are emerging in Congress: some members are pushing for coordinated federal action, while others have allowed critical infrastructure to atrophy. The stakes extend far beyond summer discomfort; they touch workforce safety, emergency medicine, food production, and transportation.

The science is settled: heatwaves will increase in frequency, severity, duration, and spatial extent as warming continues. For Congress and the administration, this means an urgent policy gap between the scale of the threat and the adequacy of current defenses.

The human toll is already measurable. A study in the Journal of the American Medical Association documented 1,722 heat-related deaths in the United States in 2022 alone. The CDC identifies heat stroke, heat exhaustion, fainting, heat cramps, and heat rash as direct consequences of extreme heat exposure. Extreme heat increases workplace injury risks and strains healthcare systems.

The economic and operational disruptions ripple across sectors. Extreme heat may accelerate degradation of roads, bridges, and railroad tracks. Aircraft performance is reduced in extreme heat, with documented flight delays and cancellations in Seattle, Portland, London, and Phoenix. Extreme heat stresses crops such as corn and soybeans, as well as livestock and poultry, reducing yields and production of meat and milk. For an administration focused on inflation and supply chain resilience, these vulnerabilities represent hidden costs that compound over time.

The Big Picture

The period 2015–2024 was the warmest decade on record since measurements began in 1880. 2024 was the warmest year on record. The trajectory is clear: some regions of the U.S. will potentially experience up to 50 additional days above 95°F at 2°C of global warming, with the largest increases projected in southern regions. Record-breaking heatwaves struck in 2021 and 2023, and historical studies document increases in heatwaves regionally during 1981–2015 and across the continental United States during 1981–2018.

Congress has oversight of federal activities authorized in congressional legislation, including those for research, preparation, response, and mitigation of extreme heat risks. National Oceanic and Atmospheric Administration (NOAA) has ongoing research to forecast extreme heat, and NIHHIS is a federal program designed to coordinate heat-health preparedness and response. News sources have reported staff and program cuts at NIHHIS, undermining the very coordination mechanism Congress designed to manage these crises.

The regulatory landscape reveals another critical gap. OSHA currently has no specific heat exposure standards. In August 2024, OSHA published a Notice of Proposed Rulemaking for Heat Injury and Illness Prevention in Outdoor and Indoor Work Settings. But the absence of binding standards leaves millions of outdoor and indoor workers vulnerable to heat-related injury without federal guardrails.

This void has prompted action at the state level. Eighteen states have proposed their own heat safety legislation in 2025. Such fragmentation creates inconsistent protections and complicates compliance for national employers.

Political Stakes

For Congress, the heat crisis presents a test of institutional capacity. Some Members of Congress introduced legislation in the 119th Congress to prepare for and mitigate against the effects of extreme heat, including health and financial risks. Two bills signal the competing approaches: S. 1743 is legislation studying the financial costs of extreme heat, while H.R. 3704 is legislation coordinating federal extreme heat planning and response. The former reflects a diagnostics-first approach; the latter pushes for immediate operational coordination.

The administration faces pressure from multiple directions. Workforce safety advocates are watching OSHA's regulatory process closely; the proposed rulemaking represents a rare window for establishing meaningful standards, but success requires sustained political will and adequate funding. Agricultural interests are pressing for investment in crop resilience and livestock management as heat stress reduces production. Economists are flagging infrastructure costs as heat degrades roads and rail networks that underpin commerce.

For Republicans, the political terrain is complex. Opposing heat safety regulations could invite accusations of indifference to worker welfare and public health. Yet embracing aggressive federal action risks conflict with business constituencies concerned about compliance costs. The state-level proliferation of heat safety laws suggests that inaction at the federal level may force more prescriptive state mandates, an outcome that typically frustrates business groups seeking uniform national standards.

For Democrats, the challenge is demonstrating that federal coordination delivers results. The NIHHIS budget cuts undermine the case for federal leadership; they suggest that even Democratic administrations have deprioritized heat preparedness. Revitalizing that program and passing H.R. 3704 would signal a pivot, but only if coupled with sustained funding commitments.

The Bottom Line

The escalating reality of extreme heat leaves federal lawmakers with a narrowing window for action. As structural disruptions mount across public health, agriculture, and commerce, the current policy vacuum has sparked a fragmented landscape of state-level mandates that complicates national compliance.

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