One person is in critical condition and four others, including three first responders, were treated following a carbon monoxide incident in Cambridge on Sunday. WBOC reports according to the Rescue Fire Company of Cambridge, volunteers were dispatched to a home on Pine Street on Feb. 8 after a concerned person contacted them about a possible carbon monoxide poisoning. Upon arrival, firefighters say they found extremely high CO levels and two critically ill people inside the home. Volunteers were able to remove the two occupants and immediately treat them at the scene.