WBEZ, Chicago's National Public Radio affiliate, created a nice story featuring the urban field work underway as part of the Department of Energy-funded CROCUS project:

https://www.wbez.org/reset-with-sasha-ann-simons/2024/09/19/chicago-scientists-turn-to-balloons-to-help-study-citys-heat

CROCUS is an Urban Integrated Field Laboratory established by Argonne National Laboratory with help from academic and community organizations and civic and industry champions. Its goal is to understand and meet the challenges of Chicago’s changing climate. Learn more about CROCUS:

https://www.anl.gov/crocus