A new study from UC Irvine indicates that public conversations on social media platforms, specifically Twitter (now X), offer insights into how different communities experience extreme heat and the assistance they may require. As high temperatures become more common and intense throughout California, understanding these varied experiences is increasingly vital for public health protection.
UC Irvine researchers analyzed 24,598 heat-related posts made across California between 2016 and 2022. The findings suggest that where individuals reside, their modes of transportation, and the resources available to them are connected to how they discuss extreme heat, including whether they describe its personal impacts or methods for coping.
The study, published in Environmental Research Communications, points to social media as a potential supplementary resource for understanding community experiences with extreme heat. This could aid in developing more precise public health interventions. The research team included Nicolas Rodriguez Garcia and senior author Suellen Hopfer from the Joe C. Wen School of Population & Public Health, Veronica J. Berrocal from the Department of Statistics, and Chen Li from the Department of Computer Science. Berrocal and Li are affiliated with the Donald Bren School of Information & Computer Sciences.
According to Suellen Hopfer, an associate professor of health, society and behavior, "Social media gives us another window into how people are experiencing heat in their daily lives." She added that understanding these daily experiences can inform more strategic thinking about the reach of heat-safety messages, identify communication gaps, and better support particularly vulnerable communities.
Extreme heat is a growing public health concern, with factors such as housing, income, and occupation known to predict heat vulnerability. Instead of solely focusing on temperatures or heat-related illnesses, the UC Irvine team examined how individuals described the daily impacts of heat and their coping strategies. This approach revealed that people living in RVs, vans, or boats—categorized as “sensitive housing”—might benefit from public health interventions specifically designed to mitigate indoor heat exposure.
The researchers categorized posts based on whether they discussed coping strategies, such as staying hydrated, using air conditioning, visiting a pool, or adjusting exercise times, or focused on life impacts, including health effects, work disruptions, canceled activities, concerns for pets or plants, changes in household expenses, and other consequences of high temperatures.
These patterns were then compared with county-level data on income, housing, transportation, and tree canopy. Generally, housing was correlated with posts about coping mechanisms, while being an active commuter was a predictor for posts describing life impacts. The study also utilized a large language model to group thousands of social media posts based on their discussion of heat, with the model’s accuracy ranging from 74 percent to 90 percent across various categories.
Some of the most distinct differences emerged concerning housing types. Counties with higher proportions of RV/van/boat households were 15 percent less likely to post positively about heat and showed 22 percent lower odds of posting about coping strategies compared to counties with fewer such households. This finding is significant because these types of homes often have poor insulation, leading to dangerously high indoor temperatures during heat waves. The researchers suggest this pattern highlights an opportunity for more focused communication on indoor heat safety, particularly for those in housing where maintaining a safe temperature can be challenging.
Transportation patterns also indicated specific vulnerabilities. Counties with a higher percentage of residents who walk, bike, or use public transportation for commuting displayed a substantially greater likelihood of posting negative heat-related content and descriptions of heat's effects on daily life. Researchers noted that active commuters face direct heat exposure during travel, making transportation infrastructure a crucial element in protecting communities from rising temperatures.
The study also identified disparities in counties with larger Hispanic populations, which showed a slightly greater likelihood of posts describing heat's impacts on daily life and a lower likelihood of posts about coping strategies. While cautioning that social media patterns should not be considered direct measures of population-level vulnerability, the researchers assert these results highlight a chance for more targeted heat awareness and intervention initiatives.
UC Irvine researchers envision social media not as a replacement for existing public health surveillance methods, but as an additional data source that could assist officials in understanding how extreme heat affects people as events unfold. The study observed an increase in heat-related posts as average monthly temperatures rose. Online conversations can capture immediate experiences, from struggles with an overheated home to altered commutes or canceled activities, potentially revealing aspects of heat exposure difficult to ascertain from traditional datasets alone.
Combining these social media signals with data on housing, transportation, and socioeconomic conditions could eventually help public health agencies pinpoint where specific types of heat communication are most needed. For instance, communities with a significant amount of sensitive housing might benefit from messages focusing on maintaining safe indoor temperatures. In contrast, areas with many active commuters could benefit from heat-conscious transportation planning and interventions aimed at reducing exposure while walking, cycling, or waiting for public transit.
Ultimately, the researchers suggest that integrating social media monitoring with automated language analysis could offer another method to identify communities that would benefit from targeted heat warnings, practical guidance, and longer-term mitigation strategies. As California prepares for increasingly frequent and severe heat events, these insights could enable public health officials to move beyond generic warnings toward communication tailored to how individuals experience and cope with extreme heat.
