Assertion: lead pencil's lead | /r/HasAspect | harmful health effects
Facets:
value: at lower levels
type: OTHER
Source sentences:
text: The US Centers for Disease Control and Prevention and the World Health Organization state that a blood lead level of 10 μg/dL or above is a cause for concern; however, lead may impair development and have harmful health effects even at lower levels, and there is no known safe exposure level.