Assertion: formaldehyde's effect | /r/HasProperty | no ventilation
Facets:
Source sentences:
text: The effect of ventilation can be seen in a recent study of Federal Emergency Management Agency (FEMA) trailers which found average formaldehyde levels were ten times higher when there was no ventilation: 1.04 (closed up), 0.39 (air conditioned) and 0.09 ppm (windows open).