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Eight cars belonging to patients who were found to have exacerbation of allergic rhinitis and bronchial asthma after turning on the air conditioner in their cars were examined. Mold concentrations inside the passenger compartment with the a/c turned off and at different climate control settings were lower than concentrations in the outside air. After turning on the air conditioner to "Max", cultures obtained at various intervals revealed that mold concentrations decreased significantly with time. Furthermore, placement of a filter at the portal of entry of outside air significantly reduced the mold concentration in the passenger compartment.

Nasal and other respiratory allergies are common in Zaria, Nigeria, during the dusty harmattan period. A survey of airborne fungi was therefore carried out during four months of the harmattan period by the culture plate exposure method. Fungi belonging to 13 genera were recovered during the survey. The highest colony count was during the months of December and January.