What is the significance of radon in the environment?

Radon is a naturally occurring radioactive gas that forms from the decay of uranium in soils and rocks. Its significance in the environment primarily lies in its status as the largest contributor to natural environmental radiation exposure for the general population. This exposure occurs when radon gas seeps into buildings, especially residential homes, through cracks in floors, walls, and other structural openings.

Radon's key role as a significant source of radiation exposure makes it crucial for public health awareness and risk assessment. Long-term exposure to elevated levels of radon is linked to lung cancer, making it a critical environmental health concern. It is important for individuals to test for radon levels in their homes and take appropriate measures if levels are found to be high.

The other options do not accurately reflect radon's environmental role. While radon may indirectly affect air quality through its radioactive properties, it is not a direct indicator of overall air quality. It is not beneficial for plant growth, and it is not a byproduct of carbon emissions, as it originates from geological processes rather than from anthropogenic sources.