mind & bodyEos
Extreme Heat May Drive Asthma Risk in Baltimore, Especially at Night
Researchers in Baltimore linked neighbourhood-level temperature maps with emergency room records to study asthma. They found 695 pediatric and 819 adult hospitalisations for severe asthma at Johns Hopkins hospitals during summers from 2016 to 2022. Using 1-metre temperature maps and 11 heat-wave definitions, they detected between 44 and 423 neighbourhood heat events, compared with 0 to 95 from official weather station data alone. Prolonged nighttime heat waves were linked to higher hospitalisation risk, especially in socially vulnerable neighbourhoods. The team recommends that Baltimore's heat alerts account for nighttime heat and local differences.
Most heat warnings rely on daytime readings from one airport sensor, so they can miss the nights when many residents are most exposed. The study shows that a fine-grained view of the city changes the picture, and that the health risk of heat is shaped by neighbourhood and income as well as by temperature.
Urban heat islands occur because dark pavement and buildings absorb and hold heat more than surrounding vegetation and open land.
Eos (AGU) · CC BY-NC-ND 3.0
Illustrative photo · BruceBlaus, CC BY-SA 4.0, via Wikimedia Commons
