On June 24, New Yorkers faced scorching 99-degree heat to cast their primary election votes, while many schools doubling as voting sites scrambled to keep students and teachers cool .

Currently, nearly one in five city classrooms lack access to air conditioning, according to Chalkbeat . Those sweltering classrooms create miserable conditions for students and teachers, and harm their ability to succeed . A Harvard University study on the exam performance of 4.5 million NYC students found that those taking a test on a 90-degree day scored 4.5% lower than those taking it on a 72-degree day. That test score drop has real consequences: it translates to a 10.9% lower chance of passing an exam, and a 2.5% lower likelihood of on time graduation.

Extreme heat is becoming more common; 202

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