City of Los Angeles Case Study

NASA's Dr. Glynn Hulley conducted surface temperature assessments of streets treated with CoolSeal in the City of Los Angeles. ‍

July 2, 2024
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NASA Researcher Evaluates CoolSeal in Three Los Angeles Communities

Dr. Glynn Hulley is a physicist in the Carbon Cycle and Ecosystems group, at the NASA Jet Propulsion Laboratory, who has conducted extensive surface temperature monitoring in California and around the world. Glynn has expertise in remote sensing, urban climate science, and public health, and aims to foster sustainable urban environments. Glynn has conducted detailed surface temperature assessments of streets treated with CoolSeal in the City of Los Angeles.  

Dr. Glynn Hulley used EcoStress satellite imagery and HyTES aerial data to confirm CoolSeal's effectiveness in reducing surface temperatures. In 2020, EcoStress showed a 6°F (2-3°C) cooling effect on Stephanie Drive in the San Fernando Valley. By 2022, HyTES revealed a 13°F (7°C) temperature difference between CoolSeal-treated Stephanie Drive and nearby untreated streets like Skouras Drive, highlighting CoolSeal's lasting impact on asphalt temperature reduction.

See Exhibit A for a visual representation of this study.


Exhibit A

In 2019, CoolSeal was extensively applied across Los Angeles, including the San Fernando Valley. During a severe heat wave in August 2021, HyTES technology demonstrated its effectiveness. CoolSeal-treated asphalt maintained a low of 104°F (40°C), while untreated roads soared to 122°F (50°C), showcasing an impressive 18°F (10°C) temperature difference. These findings highlight CoolSeal's significant cooling impact, transforming neighborhoods into more comfortable environments during extreme heat, enhancing resident comfort and well-being.

See Exhibit B for a visual representation of this study.  


Exhibit B

In July 2018, CoolSeal was applied on Lorde Street in Boyle Heights. By 2022, HyTes imagery assessed its impact, revealing Lorde Street maintained a temperature range of 93.2-96.8°F (34-36°C). In contrast, nearby traditional asphalt roads, Clement and Mark Street, recorded higher temperatures of 100.4-104°F (38-40°C). This study underscores CoolSeal's durability and success in reducing temperatures after four years of use. Moreover, CoolSeal acts as a protective barrier, safeguarding asphalt from erosion and extending its lifespan.

See Exhibit C for a visual representation of this study.


Exhibit C

These studies show that CoolSeal significantly reduces urban warming and has a proven track record with empirical data that shows its effectiveness in reducing temperatures and thereby enhancing the livability of communities. Through rigorous evaluation using advanced technologies like HyTES, researchers have demonstrated CoolSeal's ability to mitigate heat waves and protect asphalt surfaces. Moreover, the work of distinguished NASA researcher Dr. Glynn Hulley highlights the importance of cutting-edge techniques and remote sensing in understanding urban heat dynamics and promoting sustainable urban environments.

Together, CoolSeal and leading scientists are contributing to a growing body of knowledge aimed at addressing the challenges of urban heat and improving quality of life for communities worldwide.

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