Carbon monoxide forces condo building evacuation in Royal Oak

CALGARY — Ice buildup blocking the fresh air intake at a northwest Calgary condo building caused carbon monoxide (CO) to accumulate, forcing the building to be evacuated. One resident in the four-storey building on Royal Birch Boulevard. N.W. had installed her own alarm due to previous incidents involving CO, which was activated about 7 a.m. Wednesday. She called 911 and evacuated the building. The building’s CO detector was then activated, prompting another call to 911 from the alar