Assertion: smog's pollutant | /r/HasProperty | most concern
Facets:
value: due to the magnitude of pollutants
type: CAUSE
Source sentences:
text: The pollutants are formed both naturally and by humans, however, the human-induced pollutants are of most concern due to the magnitude of pollutants produced by the burning and extraction of fossil fuels, which are known to cause extreme health effects.