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Quantitative estimations of fungal aerosols are important to understand their role in causing respiratory diseases to humans especially in the developing and highly populated countries. In this study we sampled and quantified the three most dominantly found allergenic airborne fungi,  Aspergillus fumigatus ,  Cladosporium cladosporioides , and  Alternaria alternata  from ambient PM 10  samples using the quantitative PCR (qPCR) technique in a southern tropical Indian region, for one full year. Highest concentrations of  A .  fumigatus  and  C .  cladosporioides  were observed during monsoon whereas  A .  alternata  displayed an elevated concentration in winter. The meteorological parameters such as temperature, relative humidity, wind speed, and precipitation exhibited a substantial influence on the atmospheric concentrations of allergenic fungal aerosols. The morphological features of various allergenic fungal spores present in the PM 10  were investigated and the spores were found to possess distinct structural features. In a maiden attempt over this region we correlate the ambient fungal concentrations with the epidemiological allergy occurrence to obtain firsthand and preliminary information about the causative fungal allergen to the inhabitants exposed to bioaerosols. Our findings may serve as an important reference to atmospheric scientists, aero-biologists, doctors, and general public.

Seasonal variation of the dominant allergenic fungal aerosols – One year study from southern Indian region