Abstract
Indoor airborne fungi have been implicated in human health problems, damage to building materials, books, clothes and stored foods, which effected by different ecological factors. Aspergillus niger and Cladosporium sphaerospermum are the most dominant indoor airborne fungi were obtained from our previous study. The effect of normal indoor conditions (Temperature and Relative Humidity) on their growth was studied. Including their nutrients growth requirements. The PDA medium was the appropriate growth medium for Cl. sphaerospermum, with a significant difference at (p<0.05); where as GYA medium was the appropriate growth medium for A. niger, with no significant difference. The temperatures 25 and 30°C favored colony diameter growth for Cl. sphaerospermum and A. niger, respectively with a significant difference at (p<0.05). The growth of Cl. sphaerospermum increased to reach its maximum at 100% RH. Whereas, A. niger prefers to grow at lower RH comparing to Cl. sphaerospermum to reach its maximum at 75% RH with a significant difference at (p<0.05). Controlling the normal indoor conditions can play a significant role in reducing the growth of indoor airborne fungi. Cl. sphaerospermum can be used as indicator fungi for the high humidity level in residences. The result has proved that keeping the humidity low enough can prevent fungi growth.
Highlights
The importance of indoor airborne fungi has been emphasized in recent decades
A. niger prefers to grow at lower Relative Humidity (RH) comparing to Cl. sphaerospermum to reach its maximum at 75% RH with a significant difference at (p
The growth of A. niger and Cl. sphaerospermum on different temperatures is shown in Fig. 2 and Table 3
Summary
The importance of indoor airborne fungi has been emphasized in recent decades. They have been implicated in human health problems, damage to building materials, books, clothes and stored foods (Burshtein et al, 2011; Rahoma, 2011; Chadeganipour et al, 2010; Haleem et al, 2009; Tasic and Miladinovic-Tasic, 2007; McClenny, 2005; Unlu et al, 2003; Yano et al, 2003).Most people in developed countries spend more than 90% of their time indoors, in locations such as homes, offices and factories (Brasche and Bischof, 2005; Li and Kendrick, 1995). In Saudi Arabia that has along, hot summer, the significance of indoor air quality is obvious Environmental factors such as humidity and temperature plays an important role in dispersing fungi spores in air for short and long distances and when spores deposited a solid or liquid surface and if conditions of moisture and food are appropriate, they germinate (Bennett, 2010; Goncalves et al, 2010). Normal indoor conditions such as humidity and temperature provide a suitable environment for the growth of a wide of fungal spores (Ababutain, 2011; Li and Kendrick, 1995)
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