“used dust samples collected by residents to measure levels of lead and manganese…”
Are we assuming the collection was under the supervision of an outside source? Collection stations set up by an impartial air quoality testing facility?
Curious as to validity of data if samples cannot be qualified.
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“used dust samples collected by residents to measure levels of lead and manganese…”
Are we assuming the collection was under the supervision of an outside source? Collection stations set up by an impartial air quoality testing facility?
Curious as to validity of data if samples cannot be qualified.