The best suspect for the odd mist coming from the building's ventilation system, is chemical incident.
A chemical incident is the uncontrolled release of a toxic substance, potentially resulting in harm to public health and the environment.
When Victims at an unexplained mass-casualty incident report seeing an odd mist coming from the building's ventilation system, you can suspect chemical incident due to the mist mentioned.
Thus, the best suspect for the odd mist coming from the building's ventilation system, is chemical incident.
Learn more about chemical incident here: https://brainly.com/question/14472802
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