A report from University of Arizona News highlights how Ladd Keith, a researcher based at the University of Arizona in Tucson, has built a body of work on extreme heat governance that is drawing attention well beyond the Sonoran Desert. Keith's research examines how cities design and implement heat action plans, heat equity frameworks, and cooling infrastructure — work that originated in Tucson, one of the hottest large cities in the United States and a city that has recorded summer temperatures exceeding 110°F in recent years.
Keith is affiliated with the University of Arizona's College of Architecture, Planning, and Landscape Architecture, and his work has been cited in policy discussions across multiple countries as global urban heat events intensify. Tucson and the broader Maricopa and Pima County regions have served as living laboratories for his research given Arizona's documented heat burden — Maricopa County, which includes Phoenix, recorded more than 600 heat-associated deaths in 2023 according to the Maricopa County Department of Public Health, a record at the time.
His research addresses not just temperature data but the structural and planning decisions that determine which populations bear the greatest heat exposure — factors including tree canopy coverage, building materials, access to cooling centers, and the siting of heat-absorbing infrastructure like parking lots and dark rooftops.
For Arizona residents, the preparedness dimension of this research is more immediate than it might appear in an academic framing. Arizona's interconnected vulnerabilities — a power grid stressed by cooling demand during prolonged heat events, a water delivery system dependent on the Colorado River facing long-term allocation reductions, and urban airsheds that trap particulate matter and ozone during haboob season — mean that heat is rarely an isolated threat. The Arizona Department of Emergency and Military Affairs (DEMA) has increasingly integrated heat scenarios into its statewide hazard mitigation planning, and research like Keith's informs the modeling assumptions that underpin those plans. Understanding how heat governance frameworks succeed or fail at the city level has direct bearing on how communities in Arizona's fast-growing Sun Corridor — stretching from Tucson north through the Phoenix metro — can structure resilience before the next multi-day extreme heat event arrives.
