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RE: Outdoor Radon

I think it is of interest to note that conditions that lead to lower atmospheric
radon levels often result in higher indoor levels.  This is probably because
conditions that reduce radon migration to the air (wet, frozen, or snow covered
soil) result in higher in-ground concentrations and redirect the migration flow
into buildings.  This may help explain why atmospheiric radon levels are
generally higher in warmer months outside when they are lower indoors even for
sealed structure conditions.

Harry Reynolds