Southern California is getting hotter. LA County now has a heat action plan

In a week when temperatures are 20 degrees above average in parts of Southern California, the L.A. County Board of Supervisors unanimously approved the county’s first heat action plan.

The plan lays out strategies to achieve three goals in coming decades: cooler outdoor spaces, cooler indoor spaces and better public education about the dangers of heat.

The blueprint, approved Tuesday, comes as L.A. County and the world are experiencing longer, hotter and deadlier heat waves as a result of pollution trapped in the Earth’s atmosphere. It’s one of the only such plans in the region dedicated to extreme heat.

Why it matters

Already, heat is responsible for the deaths of more than 200 people each year in L.A. County, as well as thousands of emergency room visits. Since the 1980s, summer temperatures, particularly in the valleys and inland areas, have risen on average 3 degrees, with expected increases as high as 8 degrees on average in certain areas, such as the Antelope Valley, according to the plan.

A graph from the new L.A. County Heat Action Plan.

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Courtesy LA County Chief Sustainability Office

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Unless global pollution is dramatically reduced, by 2050, average temperatures in L.A. County are expected to rise nearly 4 degrees. The valleys and inland regions will see the highest heat: The San Gabriel Valley could see the number of extreme heat days above 95 degrees go from 32 a year to 74. But coastal areas won’t be spared: Long Beach could see extreme heat days quadruple, from just four days on average above 95 degrees to 16, according to local projections.

Nights are getting hotter even faster, disrupting sleep and impacting health in ways we don’t yet understand — 41% of L.A. County residents who responded to a survey for the heat action plan reported trouble sleeping on very hot nights.

“We needed to develop an all-of-government framework for dealing with rising temperatures,” said Ali Frazzini, policy director with the county’s sustainability office.

Nights are heating up faster than days as a result of climate change, affecting our sleep and health in ways we don't yet fully understand.

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Courtesy L.A. County CSO

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An invisible threat

The plan includes goals for strategies such as replacing blacktop at schools, installing shade structures, and enforcing renter protections for safe indoor temperatures.

“There wasn't the same level of centralization and systems for responding to and adapting to heat as we see with some of our other hazards,” Frazzini said.

Unlike earthquakes or wildfires, heat is something of an invisible threat, she said — it’s ubiquitous, though experienced in unequal ways, and it doesn’t cause extensive property damage. It’s not confined to certain regions.

Despite being the leading weather-related cause of death in the U.S. and here in Southern California, heat is not officially recognized as a disaster at a state or federal level, which limits funding support for public health interventions. The county hopes the plan will unify its efforts across departments and draw more state and federal funding to protect public health.

Strategies to live in a hotter LA 

The plan builds on four years of work since 2021, when the county released its first climate vulnerability assessment.

“That assessment told us where our problems were and what they were, and this plan now tells us how to address them,” said Rita Kampalath, the county’s chief sustainability officer.

Most of the strategies highlighted in the plan are in progress, though many have faced serious delays. For example, one goal includes adding shade structures to all L.A. County bus stops by 2045 — county leaders have attempted to do this for decades, and progress has been extremely slow. Other goals include greening schools and planting trees in neighborhoods with the least shade. Efforts to green schools have faced stops and starts due to funding challenges and lack of planning, though there is progress. And planting trees where they’re most needed has proved to be a lot more difficult than it may seem.

Despite the challenges of implementing the ideas, V. Kelly Turner, a heat researcher at UCLA who served on an advisory group for the plan, said "one thing the L.A. County heat action plan gets fundamentally right is that it centers people and the everyday ways that heat becomes a disruptor to daily life."

Another unique aspect of the plan, she said, is that it used shade data, not only temperature data, to inform its strategies.

"Few cities around the world are using shade maps to systematically inform heat resilience planning," she said. "So, in that respect, the county's heat action plan is truly a leader."

Below are some selected facts and figures from the plan.

Goals for 2045:

• Install functional shade structures at 100% of L.A. County bus stops. 
• Achieve 20% tree canopy in unincorporated areas. 
• Replace 1,600 acres of pavement at schools and public spaces.
• Enforce new rules that require landlords to keep units below 82 degrees.
• Reduce energy burden for low-income households to 4% of monthly budget.
• Create 30% more county cooling centers for 234 regionwide by 2045, as well as support solar and battery installation at trusted indoor community spaces.