I'd say that plastic bags are the least of our worries. IF they are---then take your own bags. BUT that said---one probably could find particles of anything if they so wanted to be a "scientist". We're the generation that grew up with paint they no longer allow (lead based) and cans that probably weren't "healthy" neither. One could get into the "chem-trails" (they are a thing btw) that are emitting who-knows-what into our atmosphere.
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