Exposure of microbial agents in the air of indoor dwellings is associated with effects on respiratory and general health. The current study was conducted in the urban area of Delhi Metropolis for the seasonal quantitative assessment of viable microbial indoor air quality. Bioaerosol measurement was conducted by using Anderson six stage impactor with cut-off diameters of 7.0, 4.7, 3.3, 2.1, 1.1, and 0.65 µm) throughout the all the seasons (April 2019 to March 2020). Meteorological parameters such as temperature and relative humidity were measured to check their effect on microbial survival. Air quality index data of the sampling area were recorded by DPCC air quality monitoring system, Ashok Vihar, Delhi. The highest (1654 ± 876.87 CFU/m³) and lowest (738 ± 443.59 CFU/m³) mean bacterial concentration in houses was recorded in August and December, respectively. Similarly, the highest fungal concentration (1275 ± 645.22 CFU/m³) was found in August and the lowest in (776 ± 462.46 CFU/m³) in January. Bacterial respirable fraction shows an irregular pattern in different seasons. In the case of fungi, the respirable fraction of 2.1 and 1.1 contributes more than 60% of total culturable bioaerosols in all seasons. Bacterial genera including Staphylococcus, Micrococcus, and Streptobacillus were most dominant, and Cladosporium, Aspergillus, Penicillium, and Alternaria were the most dominant fungal genera observed indoors. The results of this study suggest that higher respirable fungal fraction might penetrate deeper into the lungs and cause various health effects. A higher concentration of bioaerosols in outdoor areas than indoor shows that the source of indoor bioaerosols is outdoor air.

室内空气中微生物制剂的暴露与对呼吸系统和一般健康的影响有关。目前的研究是在德里都会区进行的，目的是对室内空气质量的活微生物进行季节性定量评估。在整个季节（2019年4月至2020年3月），使用截止直径为7.0、4.7、3.3、2.1、1.1和0.65μm的Anderson六级冲击器进行生物气溶胶测量。测量温度和相对湿度等气象参数，以检查它们对微生物生存的影响。采样区的空气质量指数数据由德里 Ashok Vihar 的 DPCC 空气质量监测系统记录。鸡舍平均细菌浓度最高（1654 ± 876.87 CFU/m ³ ）和最低（738 ± 443.59 CFU/m ³ ）分别出现在8月和12月。同样，8月份真菌浓度最高（1275±645.22 CFU/m ³ ），1月份最低（776±462.46 CFU/m ³ ）。细菌可吸入部分在不同季节表现出不规则的模式。就真菌而言，2.1 和 1.1 的可呼吸部分占所有季节可培养生物气溶胶总量的 60% 以上。细菌属以葡萄球菌属、微球菌属和链杆菌属为主，枝孢菌属、曲霉属、青霉属和交链孢属为室内观察到的最主要真菌属。这项研究的结果表明，较高的可呼吸真菌分数可能会更深入地渗透到肺部并导致各种健康影响。 室外区域生物气溶胶的浓度高于室内，表明室内生物气溶胶的来源是室外空气。