Harvard study finds Nevada heat complaints rise sharply at 90°F

Heat complaints in Nevada nearly eight times more likely at 105°F

When the mercury hits 105°F in Nevada, the likelihood of a worker filing a heat-related complaint is nearly eight times higher than at lower temperatures. This finding, released in a new analysis, directly challenges the state’s current approach to workplace safety—a model that business and industry groups have long championed as a flexible national blueprint.

While Nevada regulators have argued that no single temperature threshold can account for varying working conditions, the data tells a different story. According to a report by Governing Magazine, researchers at the Harvard T.H. Chan School of Public Health reviewed 2,561 heat complaints and referrals logged by Nevada OSHA between January 2015 and November 2025. The study, commissioned by the Natural Resources Defense Council, found that heat complaints across almost every industry begin to climb sharply once air temperatures reach approximately 90°F. Between 90°F and 100°F, the odds of a complaint more than triple.

The current Nevada standard does not mandate protections at a specific temperature. Instead, it relies on a “reasonable likelihood” standard, leaving employers with the sole discretion to decide when to implement protections. Under this framework, employers must conduct a one-time, written job hazard analysis to assess heat exposure, but this lack of a hard number means two different construction crews working in the same heat on the same day could be subject to entirely different safety protocols.

The debate over flexibility versus fixed thresholds

The tension between regulatory flexibility and scientific data is currently playing out on a national stage. Industry groups have pushed for the Nevada model to avoid what they view as overly burdensome mandates. In September, the U.S. Small Business Administration Office of Advocacy sent a letter to the U.S. Department of Labor requesting that any new federal regulations mirror Nevada’s approach to ensure businesses have the room to tailor standards to their specific needs.

However, researchers argue that “flexibility” may come at the cost of fundamental safety. Barrak Alahmad, a senior research scientist for the Harvard T.H. Chan School of Public Health, noted that decades of scientific evidence suggest thresholds are a cornerstone of any effective heat standard.

“We don’t think this should be the model going forward, and that the Nevada model, in fact, should have some basic thresholds that, when exceeded mandate water rest breaks and basic stuff,” Alahmad said.

The disagreement highlights a massive gap in how heat risk is managed. The proposed federal OSHA standards would require employers to implement protections when the heat index reaches 80°F. While the Department of Labor has indicated it intends to publish a revised proposal by the end of this year, Alahmad suggests there is currently little political appetite for such strict rules. A finalized federal standard is not expected until October 2027.

Vulnerable sectors and the reporting gap

The impact of these temperature fluctuations is not distributed evenly across the economy. The analysis found that nearly half of all heat complaints in Nevada originated from just three specific sectors:

Harvard study finds Nevada heat complaints rise sharply at 90°F

Hotels, casinos, and restaurants: 23%
Retail: 14%
Warehousing and delivery: nearly 8%

Geography also plays a massive role, with over 80% of these complaints originating in Clark County, the state’s most populous region and home to Las Vegas. Yet, experts warn that these numbers likely represent only a fraction of the actual danger. There is a significant concern that official records undercount the true scale of heat-related issues due to the nature of the workforce.

What new Nevada OSHA heat regulations mean for local businesses and workers

Sara Evans, chair of SEIU Local 1107’s Climate Justice Caucus, points to a stark disparity between unionized and non-unionized workers. Because only about 13% of private-sector workers in Nevada are represented by unions, many employees in small or precarious workplaces may avoid reporting hazards due to fear of retaliation or economic pressure.

“It’s super alarming that the only people that are reporting heat-related concerns at work are usually people within unions,” Evans said. “We don’t even know what’s going on in these non-unionized areas.”

As the Department of Labor moves toward its 2027 deadline, the debate remains centered on whether safety should be a matter of employer discretion or a matter of measurable, scientific fact.

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