Phoenix’s heat strategy cuts deaths as other regions face rising tolls

Extreme summer heat has driven thousands of excess deaths across Europe and the US this year, but Maricopa County — home to Phoenix, Arizona — reports a notable decline in heat-related fatalities after expanding cooling access and appointing a dedicated heat officer, officials and researchers told the BBC.

France recorded more than 2,000 additional deaths during a late June heatwave, while England and Wales estimate over 2,700 heat-related deaths since May. In the US, at least 44 heat-linked deaths were reported during the 4 July holiday weekend. Against this backdrop, Maricopa County’s targeted measures are being watched as a possible model.

Maricopa County, which experienced a peak of 645 heat-related deaths in 2023, reported a fall to 405 fatalities in 2025. Local authorities attribute part of that decline to policy changes that improved access to cooling centres, extended operating hours — in some cases 24-hour availability — and programmes that repair or replace air-conditioners for eligible residents.

Phoenix became the first city worldwide to hire a heat officer in 2021. Nicholas Staab, Maricopa County’s chief medical officer, said the county had “the relative benefit of knowing this is going to be a problem every year,” allowing sustained planning and outreach to vulnerable populations.

Still, the trend is fragile: by 11 July of this year the county had recorded 23 confirmed heat-related deaths with another 282 under investigation, figures that could surpass the prior year if confirmed.

Liberal News Analysis: What Does This Development Mean?

Heat waves are no longer episodic anomalies; they are a steadily intensifying public health challenge driven by human-induced climate change. The Maricopa example demonstrates that governance, targeted funding and a clear institutional lead can reduce harm quickly, particularly for low-income and unhoused people who face the highest risks.

Replicating Phoenix’s success elsewhere requires more than copying programmes: it demands political will, cross-agency coordination, investment in cooling infrastructure, and recognition that heat affects health, transport, and the economy. Without that systemic shift, regions new to extreme heat may see rising mortality as nighttime temperatures fail to offer relief.

Experts warn that the world has already warmed by more than 1.1°C since the industrial era, and temperatures will continue to rise for years even with emissions cuts, making near-term adaptation measures essential alongside mitigation.

Quick Glance: What You Need to Know

• Maricopa County saw heat-related deaths fall from 645 in 2023 to 405 in 2025 after expanding cooling access and appointing a heat officer.
• France reported 2,000+ excess deaths in a late June heatwave; England and Wales estimate 2,700+ heat-related deaths since May.
• As of 11 July, Maricopa County recorded 23 confirmed heat deaths with 282 cases under investigation, so gains could be reversed.