What would be an example of an elevated level?

In an effort to increase energy efficiency, home builders in recent years have built homes more tightly and allowed for much less air leakage around doors and windows. From an energy standpoint, this is a good practice. But from an air quality standpoint, such a tight house prevents the natural dilution of spores that might build up in a mold infested house. So if a tightly built home experienced a prolonged water intrusion, such as a roof leak or a shower pan leak, and large areas of mold and/or mildew grew in the home, any person living inside this house might expose themselves to elevated levels of mold or mildew spores.

 

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