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This billboard cleans up more pollution than 1,200 trees

Quote:
Dirty polluted air is a real problem in most congested cities, and finding new ways to clean it up is always a good idea. So when the University of Engineering and Technology of Peru (UTEC) decided to build a new campus in downtown Lima, they came up with an air-cleaning billboard to minimize the impact of the work on local air quality.
Endquote

https://www.dvice.com/2014-5-5/billboard-cleans-more-pollution-1200-trees

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