Which type of indoor air pollution is the second leading cause of lung cancer?

Name: Which type of indoor air pollution is the second leading cause of lung cancer?
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Radon is a colorless and odorless gas that is generated by the natural decay of uranium in soil and rock. It is the second leading cause of lung cancer, after smoking, and can seep into buildings through cracks in the foundation and walls. It is important to test homes for radon levels and take measures to mitigate high levels.

Which Type of Indoor Air Pollution Is the Second Leading