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"The U.S. Environmental Protection Agency (EPA) studies of human exposure to air
pollutants indicate that indoor levels of pollutants may be two to five times —
and occasionally more than 100 times — higher than outdoor levels. These levels
of indoor air pollutants are of particular concern because most people spend
about 90 percent of their time indoors."
“In recent years, comparative risk studies performed by EPA and its Science
Advisory Board (SAB) have consistently ranked indoor air pollution among the top
five environmental risks to public health.”
Source EPA IAQ Reference Guide at www.epa.gov.
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