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PITTSBURGH (KDKA) – Today was supposed to be the start of classes for several schools around the area, but various problems have prompted delays.

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The first day of school at Hance Elementary School in the Pine-Richland School District is on hold due to a mold problem.

The district sent out an email to parents saying it is taking the necessary precautions to clean the mold.

An optional parent meeting will be held tonight to go over the cleanup plan. The first day of school is now scheduled for Tuesday.

All other schools in the Pine-Richland School District go back today.

(Photo Credit: KDKA)

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Meanwhile, students at Mount Pleasant Junior-Senior High School will not be returning to class until Sept. 4.

The district said the wet summer took a toll on its buildings. Rain made its way into exterior windows, which led to water getting into some classrooms. Those classrooms will need to be cleaned and the windows will need to be caulked before the 900 students can go back.

Elementary schools in the district will go back today as planned.

The Plum Borough School District is delaying the beginning of the school year until Sept. 4 due to air quality concerns at the high school and Oblock Junior High School.

Lastly, a construction and expansion project is delaying the start for students in the Canon-McMillan School District until next week.

The delay applies to all grade levels in the district.

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In the Shaler Area School District, school will begin Wednesday as scheduled after air quality tests showed normal and acceptable ranges in all but two rooms in the high school. Those two rooms will be closed to staff and students while they are cleaned and dehumidified.