Home Risk Management/Safety 4 Hospitalized, 70 Evacuated in Carbon Monoxide Leak at Concord, Mass. Nursing Home 4 Hospitalized, 70 Evacuated in Carbon Monoxide Leak at Concord, Mass. Nursing Homeadmin Mar 16, 2023 0 CommentsFour people were hospitalized and 70 patients were displaced from a Massachusetts nursing home Wednesday morning after high levels of carbon monoxide leaked through the building.