Assertion: elemental mercury | /r/HasProperty | released into the air
Facets:
value: from the combustion of fossil fuels
type: CAUSE
Source sentences:
text: It is released into the air when coal and other fossil fuels are burned.
text: Elemental mercury is released into the air from the combustion of fossil fuels (primarily coal), solid-waste incineration, and mining and smelting.