An apparatus for monitoring environmental conditions favorable for mold, mildew and fungus growth includes a microprocessor having a data map, a temperature sensor attached to the microprocessor, a relative humidity sensor attached to the microprocessor, an indicator array attached to the microprocessor, and a power supply attached to the microprocessor. The indicator array may be a single warning light or an array with a plurality of warning lights. The indicator array may also be an audio speaker. The indicator array may also include a message display for digitally displaying one or more ambient condition.