Assessing Air Quality in Various Indoor Environments of a University Library

Indoor air quality is an important aspect of buildings, including libraries where various activities take place.This study aimed to investigate indoor air quality in different microenvironments in a library in Thailand.The indoor air monitoring was conducted in a library for 4 microenvironments: reading, librarian, cafe shop, and photocopy shop zone.Respiratory dust and bioaerosols were analyzed using NIOSH methods 0600, and 0800, respectively.Air movements were determined using an anemometer.Particulate matters (PM) were measured using DustTrak; carbon dioxide and comfort parameters were measured using Q-TRAK with 30-minute average for 8 hours.The results showed that the means of respiratory dust, PM 10 , PM 4 , PM 2.5 in all zones met the standard, however, temporary variation revealed that PM 4 and PM 2.5 exceeded the standard in the afternoon.Fungal concentration was above 500 cfu/m 3 in the photocopy shop zone where the highest %RH and the lowest air movement were found.Carbon dioxide concentrations in the cafe shop zone exceeded 1,000 ppm.The real-time measurements showed significant strong correlations between the different PM sizes, moderate correlations between %RH and temperature, and CO 2 and PM 10 .The findings suggest that preventive and corrective measures should be implemented to improve indoor air quality in the library.