Assertion: formaldehyde | /r/HasProperty | common indoor air pollutant
Facets:
Source sentences:
text: http://ntp.niehs.nih.gov/index.cfm?objectid=7BE524E1-F1F6-975E-76BB0ABD6CC9076A. Second, the article states that it needs a footnote for the statement that formaldehyde is a common indoor air pollutant.