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Noise

Give the measurement of the sound level (dBA)

that was measured at center of classroom during lesson center of empty classroom next to a classroom with students during lesson corridor outside of classroom during lesson center of schoolyard during 1st brake outside the cantine during brake inside teachers' office during brake inside Principle's office during brake the road outside the school's main entrance

Also make your comments (if any) about the conditions of the measurement.
(i.e. there was demonstration outside the school that day)