Florida –

“Despite the absence of legal requirements, the Broward School Board held a special meeting Tuesday to address the issue, during which they unanimously passed a measure to procure carbon monoxide detectors for all district schools.
A carbon monoxide leak at Cypress Bay High School in Weston hospitalized four staff members and a first responder, leading to an early dismissal of students and staff on Aug. 23.
A few days later, a propane leak at Oriole Elementary School in Lauderdale Lakes sent another person to the hospital and prompted a school-wide evacuation.”

Broward County to install carbon monoxide detectors in over 230 schools after reported gas leaks (local10.com)