Bioaerosols have gained importance in atmospheric sciences in the past few decades. Their exposure upsurges the health problems in sensitive population and is also known to participate in atmospheric chemistry. The present study assesses the monthly distribution of bioaerosol load at four different microenvironments inside an academic institute in Kanpur situated in Indo-Gangetic Plain (IGP). The study duration was from November 2017 to April 2018. The measured total bioaerosol concentrations were highest during April (418–610 CFU/m³) at all sites followed by the post-monsoon month of November (369–577 CFU/m³). The winter period showed low concentrations with lowest concentration obtained in January (251–419 CFU/m³). The indoor–outdoor (I/O) bioaerosol ratio was mostly less than one for bacteria depending on microenvironment, but for fungi it was always less than one. The Gram-positive bacteria (GPB) comprised 70–80% of total bacterial concentration, while Gram-negative bacteria (GNB) contributed 20–30% to bacterial concentration in ambient air. The bacterial genera were mostly dominated by Bacillus, Staphylococcus, Micrococcus, Streptococcus, and Enterococcus, while the fungal genera of Aspergillus, Penicillium, Rhizopus, Cladosporium, Basidiobolus, and Epidermophyton were seen in the campus. The statistical analysis showed a weak positive correlation of bioaerosol concentration with meteorological parameters: temperature and relative humidity (RH).

Graphic abstract

中文翻译：

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位于印度恒河平原的学术机构不同微环境中的季节性生物气溶胶负荷和统计分析

在过去的几十年里，生物气溶胶在大气科学中变得越来越重要。它们的暴露加剧了敏感人群的健康问题，并且也参与了大气化学。本研究评估了位于印度恒河平原 (IGP) 的坎普尔学术机构内四个不同微环境中生物气溶胶负荷的每月分布。研究持续时间为 2017 年 11 月至 2018 年 4 月。 测量的总生物气溶胶浓度在 4 月份所有地点最高（418-610 CFU/m ³），其次是 11 月的季风后月份（369-577 CFU/m ³） . 冬季显示低浓度，1 月份浓度最低 (251–419 CFU/m ³）。取决于微环境，细菌的室内外 (I/O) 生物气溶胶比通常小于 1，但对于真菌，它总是小于 1。革兰氏阳性菌 (GPB) 占总细菌浓度的 70-80%，而革兰氏阴性菌 (GNB) 占环境空气中细菌浓度的 20-30%。菌属主要以芽孢杆菌属、葡萄球菌属、微球菌属、链球菌属、肠球菌属为主，真菌属有曲霉属、青霉属、根霉属、枝孢属、担子属、表皮癣菌属。统计分析表明，生物气溶胶浓度与气象参数呈弱正相关：温度和相对湿度 (RH)。

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