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East St. Louis, Ill (KSDK) -- Illinois residents are reminded to check their carbon monoxide detectors as the Illinois Carbon Monoxide Alarm Detector Act hits its fifth anniversary.

Representatives from the East St. Louis Fire Department and State Fire Marshal met with residents at the Clyde C. Jordan Senior Citizens Center to explain the importance of the alarms Tuesday morning.

Illinois law requires that every dwelling have at least one approvedcarbon monoxidealarm on each floor of a home with an attached garage and/or fossil fuel burning capabilities.

The suggested replacement date of CO alarms is five years, so people are advised so replace alarms before the end of the alarm's lifespan.

Carbon monoxide is an invisible, odorless gas. It is a common by-product of incomplete combustion, produced when fossil fuels (like oil, gas or coal) burn. Because you can't see, taste or smell it, carbon monoxide can kill you before you know it's there. Exposure to lower levels over time can make you sick.