PHILADELPHIA — As snow tapers off across Pennsylvania, emergency officials are warning residents in Philadelphia, Pittsburgh and surrounding communities that the 24 hours following a blizzard can bring serious hidden risks.
One of the most dangerous threats during this window is carbon monoxide buildup caused by blocked exterior vents.
Heavy snowfall and drifting snow can bury furnace exhaust pipes, dryer vents and gas appliance outlets. When vents are partially or fully obstructed, exhaust gases may not escape properly, 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 danger often increases after the storm ends. As snow settles, compacts or refreezes, vent openings near ground level can become sealed off. 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 clearly visible and completely free of snow and ice buildup.
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 Philadelphia and Pittsburgh, officials stress that vigilance remains critical.
The storm may be ending outside — but checking vents now could prevent a life-threatening situation inside.
