Mold Information
- Potential health effects and symptoms associated with mold exposures include allergic reactions, asthma, and other respiratory complaints.
- There is no practical way to eliminate all mold spores in the indoor environment; the way to control indoor mold growth is to control moisture
entry. - If mold is a problem in your home or school, eliminate sources of moisture and clean the mold with a recommended cleaner.
- Suppress the source of the water intrusion or leak.
- Control the indoor humidity (to 30-60%) by venting bathrooms, dryers, and other moisture-generating sources to the outside.
- Clean and dry any damp or wet building materials and furnishings within 24-48 hours to prevent mold growth.
- Clean mold off hard surfaces with water and detergent, and dry completely. Absorbent materials such as ceiling tiles, that are moldy, may need
to be replaced. - Reduce the potential for condensation on cold surfaces (i.e., windows, piping, exterior walls, roof, or floors) by adding insulation.
- In areas where there is a perpetual moisture problem, do not install carpeting (i.e., by drinking fountains, by classroom sinks, or on
concrete floors with leaks or frequent condensation). - Mold can be found almost anywhere; it can grow on virtually any substance where moisture is present.
If you have IAQ and mold issues in your school, you should get a copy of the IAQ Tools for Schools Kit. Mold is covered in the IAQ Coordinator’s Guide under http://www.epa.gov/iaq/schools/tfs/guideh.html Appendix H – Mold and Moisture.
A Glossary of Interpreting Mold Data
Mold is found everywhere moisture and air are present. Ordinarily, the most severe mold species are Stachybotrys, Cladosporium, and
Fusarium because they produce toxins. Among such species, Stachybotrys (black mold) is the worst. Once discovered,
it needs to be remediated (abated).
Alternaria, Aspergillus, Basidiospores, Curvularia, Epicoccum, and Penicillium form the next group to be watched closely for
people with compromised immune system or with allergies. The indoor concentration of these spores will affect residents depending on their
health factors.
Comparing outside and inside readings, when spore counts outside are greater than inside, one can assume that spores could be migrating from
outside. If inside spore count readings are greater than outside, then mold could be growing inside.
Relative humidity (RH) is an indication of the amount of water in the room. The American National Standards Institute
(ANSI) and the American Society of Heating, Refrigerating, and Air Conditioning Engineers (ASHRAE) developed ANSI/ASHRAE Standard 55-2004,
“Thermal Environmental Conditions for Human Occupancy”. Since prolonged humidity levels above 60% allow molds, spores, and fungi to propagate
(grow), ANSI/ASHRAE recommends that indoor relative humidity (RH) levels not exceed 60%. ASHRAE states that “Relative Humidity in habitable
spaces preferably should be maintained between 30% and 60% to minimize growth of allergenic or pathogenic organisms”.
In conclusion, measurements of indoor air quality parameters are indicators of environmental conditions, at a specific moment in time, and
these often change rapidly.
“Most molds, even if you can smell them, are not harmful,” says the UC Berkley Wellness Letter. However, each complaint needs to be
handled separately, considering each employee experiencing upper respiratory ailments and chemical sensitivities with great care and caution.
Limited Glossary of Molds
Last updated: 8/30/2016