BALTIMORE — As snow tapers off across Maryland, emergency officials are warning residents in Baltimore, Annapolis and surrounding communities that the 24 hours after a blizzard can carry serious hidden risks.
One of the most dangerous threats during this window is carbon monoxide buildup caused by blocked exterior vents.
During heavy snowfall, furnace exhaust pipes, dryer vents and gas appliance outlets can become buried or partially obstructed by drifting snow. When those vents are blocked, exhaust gases may not properly escape, allowing carbon monoxide to accumulate inside the home.
Carbon monoxide is colorless and odorless. Without a working detector, it can build unnoticed.
Officials say the risk often increases after the storm ends. As snow settles, shifts or refreezes, vent openings can become compacted with ice. Heating systems may continue running for extended periods as homes recover from prolonged cold.
Residents are urged to inspect exterior vents once conditions are safe. Exhaust pipes should be fully visible and completely clear of snow and ice buildup, especially those located near ground level.
Authorities also recommend checking carbon monoxide detectors to ensure they are functioning and have fresh batteries. Early symptoms of exposure may include headache, dizziness, nausea or confusion.
Emergency officials emphasize that tightly sealed homes during winter weather can intensify the danger if ventilation is compromised.
As cleanup begins across Baltimore and Annapolis, officials stress that post-storm vigilance remains critical.
The snow may be ending outside — but checking vents now could prevent a life-threatening situation inside.
