What harmful substance do compact fluorescent light bulbs contain?

Compact fluorescent light bulbs (CFLs) contain mercury, which is a harmful substance. Mercury is used in these bulbs because it helps to create light when an electric current is applied. When CFLs are disposed of improperly, they can break and release mercury into the environment, which poses significant health risks and environmental concerns. Therefore, it's essential for households to handle these bulbs carefully and to recycle them through designated programs to avoid contamination. Understanding the presence of mercury in CFLs emphasizes the importance of proper disposal and awareness of environmental safety regarding fluorescent lighting options.