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In Barcelona, is being tested a product, that mixed with street cleaning water, reduces air pollution. Pic shows sensor station analizing.
Toni R3
Toni R3 May 06, 2013
In Barcelona, is being tested a product, that mixed with street cleaning water, reduces air pollution. Pic shows sensor station analizing.

I've seen these sensors...

Often 1
Occasionally 2
Rarely 2
Never 5
What is it? 1
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