In some regions, yes.
to improve air quality and human health
Mean concentration of radon in air: 150 atoms/cm3 Radon in the earth crust: 4.10-16 mg/kg Radon in the sea water: 6.10-19 mg/L
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No. Radon is a dense gas.
Radon is everywhere in the world, but its concentrations in air are very different.
Radon is a gas found in the air. It can cause lung cancer so beware!
Radon is an indoor air pollutant that can be a warning to home owners.
You may need radon testing or radon mitigation for your home if the air is below 4 picocuries per liter (pCi/L) in indoor air.
In a geographical sense, just about everywhere. It is more common in certain areas than others. It's considerably heavier than air, so radon escaping from the ground into the atmosphere tends to collect in low places, particularly those which are enclosed and have little air circulation. Typically in a house the highest concentration of radon will be found in the basement.
It is present in the ground below the house and enters from below.
Indoor air pollution :)
Joseph M. Hans has written: 'Seasonal variations of radon and radon decay product concentrations in single family homes' -- subject(s): Atmospheric radon, Environmental aspects of Radon, Indoor air pollution, Physiological effect, Radioactive pollution, Radon