Effort was made to analyse the biological components along with inhalable, thoracic and alveolic particles in aerosol samples collected from nine distinct locations of Northeast India during post-monsoon season (October–November) for the very first time. Microscopic analysis reveals the presence of 70–90% of non-biological particles followed respectively by pollens (9–18%), animal debris (1–12%) and fungal spores (1–6%). The concentration of bacteria in air sample ranges from 45.5 to 645.84 CFU/m³. All the bacterial isolates showed sensitivity against broad (Chloramphenicol and Ampicillin) and narrow (Vancomycin and Erythromycin) spectrum antibiotics which indicates lesser threat to human health. Moreover, the concentration of microbial content in the bioaerosol samples are less compared to some of the reported values in other parts of India. The predominant microbial genera in the collected bioaerosol samples were identified as Gram positive Diplobacilli sp. followed by Diplococci sp. Pollens of 10–20 µm diameter, which are mostly considered as potential allergens, contribute only up to 20% of total pollen content in the bioaerosol sample collected from various locations indicating healthier air.

努力分析了季风后季节（10月至11月）首次从印度东北部9个不同地点采集的气溶胶样品中的生物成分以及可吸入的，胸腔和肺泡颗粒。显微镜分析显示存在70-90％的非生物颗粒，其次是花粉（9-18％），动物残骸（1-12％）和真菌孢子（1-6％）。空气样本中细菌的浓度范围为45.5至645.84 CFU / m ³。所有细菌分离株均对宽谱（氯霉素和氨苄青霉素）和窄谱（万古霉素和红霉素）抗生素敏感，表明对人体健康的威胁较小。此外，与印度其他地区的某些报告值相比，生物气溶胶样品中的微生物含量浓度更低。收集到的生物气溶胶样品中主要的微生物属被鉴定为革兰氏阳性双歧杆菌。其次是Diplococci sp。直径为10–20 µm的花粉通常被认为是潜在的过敏原，仅占从各个位置采集的表明空气更健康的生物气溶胶样品中总花粉含量的20％。