Submitted by ghostofhogan t3_111hbdu in washingtondc
Administrative-Egg18 t1_j8kjo3q wrote
Reply to comment by mrsgeologist in Ohio toxic air in DMV? by ghostofhogan
If it's like radioactivity, then it would be 3 days. 1.5 days to reduce by 50% and then another 1.5 days to reduce by another 50% to 25%.
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