What is a frontline community?

Although millions of individuals are vulnerable to extreme heat, frontline communities include neighborhoods and groups of people that:

  • Experience the impacts of climate change and extreme heat "first and worst", with substantial health and environmental outcomes.
  • Are physically and economically vulnerable to climate change's most dire impacts, with limited capacity to adapt.

Historical factors and inequities play a strong role in exacerbating the impacts of extreme heat for frontline communities.

"Children need to get out, and sometimes they feel like getting out in the sun. How he plays, and runs! I like to watch him have fun, but I am worried that extreme heat and direct exposure to the sun can hurt him. With so few trees and no guarantee that the fountains will work, we must carry enough bottles of water, and we must minimize the time spent in the park.- Nohemi"

Frontline Community: 
School Age Children

Frontline Community: 
Outdoor Workers

"My husband works in construction. During heat waves, construction workers are vulnerable to dehydration and heat shock, and the effects of intense heat can increase the risk of occupational accidents. Once I heard a construction worker say that on a very hot day, he felt like his shoe soles were melting when walking on a roof. What protections do labor regulations offer to protect these workers from the intense heat and their health risks? - Roxana"

Frontline Community: 
Residents of Urban Heat Islands

"Here is the view of Chestnut Street standing at Beacon Street. The lack of trees and vegetation is notable, particularly given the proximity to the loud and dirty Tobin Bridge. - Susana

Aquí está la vista de la calle Chestnut desde estar parado en Beacon Street. La falta de árboles y vegetación es notable, particularmente dada la proximidad al ruidoso y sucio puente Tobin."

Frontline Community: 
Low-income Households

"On this street in Chelsea, free food is distributed once a week. People are waiting in line early in the morning, waiting for their turn, for a long time. It is hard to have use this resource to keep going every day, but the elderly, on hot days, these people must wait under the sun until their turn, without being able
to take refuge in the shade What could the city do about this?
– Nohemi"

Frontline Community: 
Indoor Workers (Kitchens + housekeeping)

"This is my workplace. It is an enclosed space, and when we cook the heat and humidity feels very intense; it feels unbearable. Since the room is very small, we don't have space for the fan stand on the floor. So, we hang the fan head in the coat hanger. We know it is not an ideal solution, but it is all we can do. - Mayra"
"Este es mi lugar de trabajo. Es un lugar cerrado, y al cocinar se acumulan en la habitación la humedad y el calor intenso, que se hace insoportable. Como el cuarto es muy pequeño no tenemos donde poner un ventilador de suelo, pues las patas no caben. Así que colgamos la cabeza del ventilador en el perchero. Sabemos que no es una solución ideal, pero es todo lo que podemos hacer.  - Mayra"

Frontline Community: 
Outdoor Commuters, People with Disabilities

"Broadway St. near Carry Ave. around 1:30pm. Absolutely no protection from the sun. The person waiting at the bus stop and the person in the wheelchair (and who’s pushing the wheelchair) are sweltering in the sun. It definitely sheds light on the need for protection in the City." - Racquel

"Broadway cerca de la Avenida Cary, el sábado alrededor de la 1:30 de la tarde. Absolutamente ninguna protección del sol. La persona que espera en la parada del autobús y la persona en la silla de ruedas (y que empuja la silla de ruedas) se están sofocando al sol. Definitivamente refleja la necesidad de protección en la Ciudad." - Racquel


Frontline Community: 
People with No AC or Inability to Pay for Electricity

"This is an old and inefficient air conditioner unit. It is difficult to save energy with it because I have to keep it on all night to be effective. I worry about the excessive electricity bill because of this AC."- Noemy


Photos and Quotes Courtesy of the C-HEAT 2021 Photovoice/Fotovoz Project, Boston University

Why worry about extreme heat?

Heat is a "silent killer" - meaning it lacks the visible devastation of other extreme weather events, such as storms, and often has severe impacts on health by exacerbating other health issues such as chronic illnesses.

Exposure to extreme heat results in more emergency room visits, more hospital admissions, and more deaths than hurricanes, floods, and tornadoes combined.

Disadvantaged communities within cities systematically experience heat exposure health impacts at disproportionately higher rates.

In the last twenty years, extreme heat events have increased in frequency and duration, affecting millions of people globally.

About Us

We are a transdisciplinary team based out of Boston University

with partners at Dialogue Earth, A Better City, and Iseechange, experienced in community-engaged climate and health research and communications, data and maps for decisions, and multi-city partnerships.

Latest Impact

From our latest articles and research translation to collaborative multi-media projects and stories, see all of our impact here.

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October 27, 2025
Street vendors are struggling with rising temperatures

Leaders and scientists are seeking solutions to the health and income problems that extreme heat causes for Global South food stall traders

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October 10, 2025
Why heat warnings need to get more local

As cities are warming in very uneven ways, experts say heat warnings need to become more granular to save lives.

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Sources
  1. Gurrentz, B & Sawyer, R. (2023). Almost a Quarter of U.S. Population Vulnerable to Rising Heat. U.S. Census Bureau. https://www.census.gov/library/stories/2023/07/almost-a-quarter-of-population-vulnerable-to-rising-heat.html
  2. Mohnot, S., Bishop, J., & Sanchez, A. (2019, August). Making Equity Real in Climate Adaptation and Community Resilience Policies and Programs: A Guidebook. The Greenlining Institute.
  3. M. Patricia, F., Goldman, A., & Herst, R. (2024, September 15). Thinking climate change? Think exposure to extreme heat. CommonWealth Beacon. http://commonwealthbeacon.org/opinion/thinking-climate-change-think-exposure-to-extreme-heat/ 
  4. World Health Organization. (2018, June 1). Heat and Health. Fact Sheets. https://www.who.int/newsroom/fact-sheets/detail/climate-change-heat-and-health
  5. Hsu, A., Sheriff, G., Chakraborty, T., & Manya, D. (2021). Disproportionate exposure to urban heat island intensity across major US cities. Nature Communications, 12(1), 2721. https://doi.org/10.1038/s41467-021-22799-5 
  6. Zhang, H., Luo, M., Pei, T., Liu, X., Wang, L., Zhang, W., Lin, L., Ge, E., Liu, Z., & Liao, W. (2023). Unequal urban heat burdens impede climate justice and equity goals. The Innovation, 4(5). https://doi.org/10.1016/j.xinn.2023.100488