The indoor environmental condition was assessed in houses with allergy (asthma and atopy) patients by use of a fungal

detector. The fungal index was calculated from the growth rate of the sensor fungi in a fungal detector encapsulating

the spores, Alternaria alternata S-78, Eurotium herbariorum J-183 and Aspergillus penicillioides K-712. Fungal indices

were higher in asthma patient’s houses than in control houses and Eurotium herbariorum showed the highest growth

response among the sensor fungi. Dust mites allergen, Der f1, was also significantly high in allergy patient's houses

where fungal indices above 10 were detected. A correlation was observed between the fungal indices and dust mite allergen

proliferations in examined houses. Therefore, the fungal index can be a useful tool as an indirect indication for

detecting chronic dampness that brings both contaminations by fungi and dust mite.