Classroom indoor air quality and its association with sick Building syndrome (SBS) symptoms in a Malaysian university setting.

Concentrations in LH-A generally showed a decreasing trend from a peak at 8:00 a.m., while LH-B and LH-C maintained relatively stable, elevated levels throughout the day, with LH-C exhibiting the highest overall concentrations among the lecture halls.

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LH-C generally exhibited the highest CO concentrations throughout the day, showing an increasing trend from 8:00 a.m. to a peak around 3:00 p.m., followed by a slight decrease.

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