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A comment on Smell PGH lets you report weird smells in Pittsburgh. Parent comment
Here is an article from MIT in 2014 detailing recent discoveries and improvements in chip tech that could allow this: http://news.mit.edu/2014/wireless-chemical-sensor-for-smartp...
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Here is an article from MIT in 2014 detailing recent discoveries and improvements in chip tech that could allow this: http://news.mit.edu/2014/wireless-chemical-sensor-for-smartp...