The criteria of building selection are based on long history of occupancy and age of buildings. The study population
comprised the respondents determined with 44 people, 6 people and 13 people who are worked at PPAP, PKBF and PMA,
respectively. The PPAP building is occupied by many workers thus, the number of respondents of PPAP building is higher
than the respondents in the PKBF and PMA building