Third-hand smoke is the residue left behind by tobacco smoke. This video describes how measurements made in a non-smoking classroom were able to identify the chemical signature of this residual smoke in indoor particles.

 

Image by Mabel Amber, still incognito… from Pixabay

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The original research article describing these results can be read for free at the following link: http://advances.sciencemag.org/conten… Research performed by the DeCarlo Research Group: http://www.drexelair.com/news/

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