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Air pollution is often linked to smoke from vehicles, dust and the burning of waste. But scientists say there is another dangerous pollutant in the air that people cannot see or smell — radon gas. Researchers at the Ghana Atomic Energy Commission say the radioactive gas is naturally present in the environment, and prolonged exposure could increase the risk of lung cancer, even among non-smokers. Senior Research Scientist at the Commission, Dr Irene Opoku-Ntim, explains.