![]() After cleaning, the bacterial and fungal counts on indoor surfaces showed significant reduction, suggesting that the cleaning procedures were effective. An insignificant association between indoor and outdoor PM2.5 (r = 0.21 p 0.05), an I/O ratio of PM2.5 with an average value of 1.2, and an I/O ratio of CO 2 exceeding 1 suggest a minor impact of outdoor air. For the entire sample (pre- and post-cleaning), the ATP values were heterogeneous, averaging 230 RLU/100 cm 2, 140 RLU/100 cm 2, 120 RLU/100 cm 2, 135 RLU/100 cm 2, 99 RLU/100 cm 2, and 80 RLU/100 cm 2, in offices, classrooms, toilet doorknobs, reception desks, main lobbies, and exit doorknobs, respectively. ![]() ![]() ![]() The ATP bioluminescence test demonstrated a significant correlation (r = 0.89 p 0.05) with bacterial count obtained from swab specimens and a moderate correlation (r = 0.57 p 0.001) with viable settling bacterial count. The association between indoor air quality, surface contamination, and IAQ under heterogeneous cleaning procedures are all crucial factors that were investigated in this study. Studies on indoor air quality (IAQ) have linked exposure to microorganisms in indoor air to a variety of illnesses.
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