Formaldehyde: A Range of Standards

The World Health Organization classified formaldehyde as a human carcinogen in 2004. While the United States limits workplace exposure, it has never regulated indoor air quality. With no binding standard for homes, manufacturers say levels recommended by health agencies are too low and cite higher thresholds identified by housing regulators.

[Chart: Comparing U.S. agency standards against the formaldehyde levels found in FEMA trailers]

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