2018 No https://pubmed.ncbi.nlm.nih.gov/30660144/ Nedojedla, Petra Europe Observational Exposure Study Students Elementary (K-5) Noise Equivalent sound pressure level Primary schools Noise Teacher Lessons The mean equivalent A-weighted sound pressure level during lessons irrespective of age and subjects taught was 68.0
± 3.4 dB (uncertainty of measurement). The highest levels of noise were in physical education and arts; the lowest levels were found for English taught as a
foreign language. There were no statistically significant differences in L
Aeq,T depending on the numbers of children in the classes. The main source
of noise is pupils. Attention should be paid to negative feelings of noise to reduce L
Aeq,T in schools