Radon Exposure as an Occupational Hazard and Environmental Risk Factor for Lung Cancer in Utah: Assessment, Mitigation, and Policy Implications.

Background:

Radon is the second leading cause of lung cancer in the United States and a major environmental and occupational health concern. Utah's geology, rich in uranium and granite deposits, creates a high potential for radon accumulation in both homes and workplaces. Despite Utah's relatively low smoking prevalence, lung cancer remains a significant public health issue, suggesting that radon exposure may play a critical role. This article examines radon exposure in Utah as an environmental and occupational hazard, exploring its connection to lung cancer, mitigation efforts, and policy implications. It highlights how cancer registry data, particularly from the Utah Cancer Registry (UCR), can be used to assess regional cancer patterns, identify high-risk populations, and support targeted public health interventions. Integrating environmental and occupational exposure data within cancer registries is essential to guide effective radon mitigation and strengthen evidence-based policy in Utah and similar high-risk regions.

Introduction

Lung cancer remains the leading cause of cancer-related mortality in the United States, causing approximately 127,000 deaths annually.¹ While tobacco smoking accounts for most cases, radon exposure is the second leading cause of lung cancer and the leading cause among nonsmokers.² Radon is a colorless, odorless radioactive gas produced by the decay of uranium that is naturally present in soil and rock. Radon gas can accumulate in enclosed spaces such as homes, mines, and workplaces, where prolonged exposure increases the risk of lung cancer.³

Utah presents a unique case in radon-related lung cancer epidemiology. The state's population has one of the lowest smoking rates in the nation—less than 9% compared to the U.S. average of 14%—yet lung cancer continues to represent a major cause of cancer morbidity and mortality.⁴ (Figure 1.) This paradox underscores the significance of environmental factors, particularly radon exposure, in Utah's lung cancer burden. Approximately 1 in 3 Utah homes tested by the Utah Department of Environmental Quality (DEQ) exceeds the U.S. Environmental Protection Agency's (EPA) radon action level of 4 picocuries per liter (pCi/L).⁵

Figure 1.

Lung Cancer Incidence by Smoking Status, Utah Versus United States

The Utah Cancer Registry (UCR), part of the National Cancer Institute's Surveillance, Epidemiology, and End Results (SEER) Program, provides an opportunity to integrate cancer incidence data with environmental and occupational exposure information. Such integration can reveal patterns linking geographic areas of high radon potential with elevated lung cancer rates, supporting targeted public health interventions and evidence-based policy.

This paper discusses the role of radon as both an occupational hazard and environmental risk factor for lung cancer in Utah. It emphasizes assessment and mitigation strategies, explores policy implications, and highlights how cancer registry data can enhance understanding and management of radon-related cancer risks.

Methods and Data Sources

This article draws from published literature, governmental reports, and publicly available environmental and cancer incidence data to explore relationships among radon exposure, lung cancer, and registry data applications in Utah. Data sources include:

• The Utah Cancer Registry (UCR), for lung cancer incidence by county and demographic variables.

• The Utah Department of Environmental Quality (DEQ) and EPA Radon Zone Map, for radon potential classification across counties.

• Prior epidemiologic studies assessing radon exposure and lung cancer in Utah and North America.^6,7

• Peer-reviewed literature addressing occupational exposure and mitigation strategies.^8,9

Though the UCR currently does not collect direct measurements of radon exposure, geographic and occupational fields in registry records can be used to analyze patterns across high-risk regions. By correlating cancer incidence data with radon potential maps, public health agencies can better identify communities requiring focused radon mitigation and awareness programs.

Results and Discussion

Environmental Risk and Geologic Context

Utah's geologic composition contributes significantly to its radon exposure risk. The state's mountainous terrain and uranium-rich bedrock, especially along the Wasatch Front and in the southern regions, facilitate radon release from soil into residential and occupational environments.⁵ During colder months, homes are sealed against the cold, increasing indoor radon accumulation. Studies estimate that roughly 33% of tested homes exceed the EPA action level.⁵

A population-based study by Ou et al. demonstrated geographic disparities in lung cancer incidence across Utah, with higher rates in non-metropolitan areas characterized by elevated radon potential.⁶ The study concluded that radon exposure represents a serious risk factor for lung cancer in Utah's low-smoking population, particularly in counties with historical mining activity.

Occupational Exposure

Radon is also an occupational hazard, particularly in industries in which workers spend time underground or in poorly ventilated environments. Historically, uranium miners in southeastern Utah were among the first populations recognized to have increased lung cancer risk due to radon and its progeny.¹⁰ Although uranium mining has declined, workers in construction, water treatment, energy production, and maintenance of basements or tunnels may still experience elevated radon exposure.

Occupational radon levels exceeding background concentrations have been documented even in non-mining industries.⁸ Such exposures, while often lower than historical mining levels, remain cumulatively significant. Occupational surveillance and safety programs in Utah can integrate registry data to identify lung cancer cases potentially associated with occupational exposures.

Lung Cancer Trends and Registry Data

According to the UCR, lung cancer remains one of the most frequently diagnosed cancers in Utah, despite the state's low tobacco use.¹¹ The registry's population-based data allow for spatial analysis of incidence trends that may correspond with environmental and occupational risk factors. For example, mapping lung cancer cases by county and overlaying EPA radon zone data can highlight correlations between geographic radon potential and cancer incidence. (Figure 2.)

Figure 2.

Radon Levels Versus Lung Cancer Incidence in Utah

Cancer registrars contribute to this analysis by accurately abstracting residence, occupation, and industry information from patient records. While specific environmental exposure fields are limited in current registry standards, narrative text fields and geographic coding enable subsequent data linkage with environmental datasets. This enhances the utility of registry data for public health research on radon-related cancers.

Mitigation and Public Awareness

Public awareness of radon risk in Utah remains low. A 2021 survey found that 99% of respondents were unaware of state policies related to radon testing and mitigation, and only 16% had tested their homes.¹² Although Utah participates in the EPA's “Radon Action Month” each January and offers free or low-cost test kits, voluntary testing remains inconsistent. Barriers include limited awareness, lack of enforcement, and minimal funding for mitigation programs.

Mitigation measures—such as soil depressurization systems, improved ventilation, and radon-resistant construction—have been proven to be effective.¹³ However, Utah does not mandate radon testing during real-estate transactions or require radon-resistant design in new construction. The combination of voluntary compliance and limited policy enforcement contributes to ongoing exposure risk, especially in older housing and rural areas.

Policy Implications and Challenges

Several policy challenges impede effective radon control in Utah. First, radon exposure is often viewed as a private household issue rather than a broader public health priority. Second, there is insufficient integration between environmental agencies, occupational safety regulators, and cancer registry systems. Finally, limited funding restricts long-term monitoring and mitigation assistance programs.

Addressing these challenges requires a coordinated strategy that includes:

• Incorporating environmental exposure fields in cancer registry data collection.

• Promoting data linkage between the UCR and DEQ radon maps.

• Strengthening public education through health departments and community health centers.

• Implementing statewide policies for radon testing and mitigation in residential, occupational, and public buildings.

Registry Application

The cancer registry's role extends beyond passive data collection; it is a cornerstone for surveillance and public health action. Cancer registrars are uniquely positioned to improve the understanding of environmental and occupational cancer risks through accurate abstraction and data enhancement.

Data Abstraction and Accuracy

Registrars ensure accurate coding of lung cancer cases, including primary site, histology, stage, and demographic information. By consistently recording residence and occupational history, registrar provide critical context for environmental exposure assessment.

Geographic and Occupational Linkage

Geographic identifiers (county, ZIP code) within registry data allow linkage with EPA radon zone maps, facilitating spatial analysis of radon-related cancer clusters. Occupational data, though often incomplete, can identify cases within industries at higher risk of radon exposure, such as mining or construction.

Quality Improvement and Standardization

Standardizing environmental and occupational data fields across registries could enhance national surveillance of radon-associated lung cancer. Collaboration with the North American Association of Central Cancer Registries (NAACCR) could lead to inclusion of structured exposure variables.

Research and Policy Support

Registry-based analyses can inform public health decision-making by identifying high-risk areas that merit targeted radon testing, mitigation funding, or workplace safety initiatives. In Utah, registry data have already been used to assess regional disparities in lung cancer incidence, guiding research into environmental causation.^6,11

By integrating environmental and occupational factors into registry practices, oncology data specialists can transform cancer registries into proactive tools for cancer prevention, not just documentation.

Policy Recommendations

Data from the UCR and similar registries underscore the need for a multifaceted policy approach to radon mitigation in Utah. Recommendations include:

• Mandatory radon testing: Require radon testing during real estate transactions and in rental properties, schools, and public buildings in high-risk counties.

• Radon-resistant construction codes: Adopt radon-resistant building requirements in new construction, particularly in EPA Zone 1 counties.

• Registry-environmental integration: Establish data-sharing agreements between the UCR, DEQ, and occupational health agencies to enhance exposure surveillance.

• Public health funding: Expand funding for statewide testing and mitigation programs, especially for low-income and rural households.

• Education and training: Include radon awareness and documentation practices in cancer registry training programs to strengthen environmental data quality.

Through these actions, Utah can leverage its cancer registry infrastructure to drive meaningful environmental health policy and reduce preventable lung cancer cases.

Conclusion

Radon exposure remains a critical yet under-recognized contributor to lung cancer in Utah. The state's geology and climatic conditions create a persistent environmental and occupational hazard. Although awareness and voluntary testing programs exist, they are insufficient to address the magnitude of risk. Integrating environmental data with cancer registry systems, particularly the Utah Cancer Registry, offers a powerful avenue for surveillance, research, and policy intervention.

Cancer registrars play a pivotal role by ensuring accurate data abstraction and fostering collaboration between environmental and public health entities. By linking radon exposure patterns with lung cancer incidence, Utah can identify high-risk populations, improve mitigation strategies, and develop data-driven policies that reduce the burden of lung cancer statewide.

Ultimately, strengthening the intersection of cancer registries, environmental monitoring, and public policy will enhance prevention efforts—not only in Utah but across all regions facing elevated radon exposure.