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Boston is experiencing a record-breaking heatwave, with temperatures potentially exceeding 100°F on Tuesday, potentially breaking all-time records. High humidity will push the heat index to around 110°F, posing health risks. Authorities urge residents to stay hydrated, limit outdoor activity, and seek air conditioning, especially between 11 a.m. and 5 p.m. Relief is expected by Thursday with temperatures dropping to the 70s.

Prepared by Olivia Bennett and reviewed by editorial team.