Wildfire Smoke and Heat Impact Many California Adults
New survey data shows over half of state adults faced extreme heat or wildfire smoke in the last two years.
Updated on Oct. 15, 2026 in Asthma
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New data from the 2025 California Health Interview Survey reveals that over half of the state's adults experienced wildfire smoke or extreme heat in the last two years. The findings provide insights into how environmental conditions and social barriers affect health access for Californians across the state.
Why it matters
Understanding these environmental and systemic health burdens helps residents recognize the frequency of climate-related stressors. This data serves as a foundation for health policies aimed at improving care access and resilience against recurring events like extreme heat and wildfire smoke.
The 2025 California Health Interview Survey, conducted by the UCLA Center for Health Policy Research, includes responses from 22,036 adults across the state. While it quantifies recent experiences with wildfires and heat, it does not yet establish definitive long-term health outcomes.
The players
UCLA Center for Health Policy Research
An academic institution that conducts statewide health surveys to inform public health policy.
The details
Researchers collected data to map how climate events and social drivers, such as immigration status and access to physicians, influence public health. In Los Angeles County, 30% of adults reported experiencing wildfires in the last two years, with nearly 19% of those who encountered smoke reporting subsequent physical health harm. The survey also tracks behavioral trends, noting that 9.6% of Californians aged 18 to 29 reported vaping within the last month.
Timeline
2001: The annual survey was first launched.
January 2025: Wildfires occurred in Pacific Palisades and Altadena.
October 2026: Survey results were released.
Health Landscape
The California Health Interview Survey provides a critical longitudinal view of how environmental and social factors evolve over time in the state. By tracking these metrics, public health officials can better align resources with the shifting needs of a population facing frequent climate-related threats.
Frequent exposure to wildfire smoke and extreme heat can exacerbate existing respiratory conditions like asthma. If you notice persistent respiratory symptoms following poor air quality events, it is worth discussing your health status and any necessary precautions with your physician.
The takeaway
Climate-related stressors like extreme heat and wildfire smoke are becoming common experiences for many Californians. Tracking your personal sensitivity to air quality and extreme weather is a proactive step; consult your doctor if you experience recurring health issues during these events.
Further reading
Learn more about managing respiratory health in our California Asthma resource section.
More information
View the complete survey findings on the UCLA Center for Health Policy Research official portal.
Source note: This article includes information reported by My News LA.
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