A quantitative evaluation of indoor environmental quality in refurbished kindergarten buildings: a Malaysian case study by Salleh, N.M., Kamaruzzaman, S.N., Riley, M., Zawawi, E.M.A., Sulaiman, R.

“…Noise was the least satisfactory IEQ factor due to the closeness of the kindergartens to main roads (external noise), as well as the small size of classrooms (internal noise). …”