Caveats: average behavior described with anecdotal evidence of variation, wide variation, depends on weather, geography, geology, construction practices, most applicable in central NA based on references
Room to room within a floor
Not much variation; ~10% in most homes; Maximum difference in survey was ~200% in an upper floor with the high room near a laundry shoot.
Floor to floor to floor within a home
Depends strongly on HVAC induced air movement from floor to floor. Highest diffrences when basements are isolated by closed doors from upper levels, electric or hot water heat, and loose superstructure: ~twice as high in basement as higher floors. In forced air homes with good cold air return, the radon in upper floors is almost the same as in the lowest floor.
Home to home within a neighborhood
Usually with ~150% unless some prominent geological feature cutting across the neighborhood.
Neighborhood to neighborhood within a town
Usually ~200% unless some prominent geological feature cutting across the town.
Town to town within a state
Usually ~300 %
State to state
Country to Country
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