Comparative analysis of microbial concentration in urban public buildings in different climate zones

 In order to study the indoor microbial pollution of public buildings in different climate zones, selecting Kunming and Nanjing to represent temperate zone and hot summer and cold winter zone, respectively, measures and analyses the microbial concentration in hospital and office buildings. The results show the average concentrations of bacteria and fungi are 520 cfu/m³ and 316 cfu/m³ in hospitals, 369 cfu/m³ and 520 cfu/m³ in office buildings in temperate zone, respectively, higher than those in corresponding public buildings in hot summer and cold winter zone. The particle size distribution of bacteria and fungi in the two climate zones is similar, and the peak values appear in the particle size range of grade Ⅳ (2.1 to 3.3 μm) and grade V (1.1 to 2.1 μm). There is a definite relationship between indoor relative humidity and airborne fungal concentration in public buildings in the two climate zones, however, significant correlation between temperature and microbial concentration is only found in Kunming’s hospitals.