“Living Light” is a piece of public art that uses networked panels to reveal the real-time air quality of each neighborhood in Seoul, South Korea.

The Huntington Beach Art Center in California is currently holding an exhibition of three site responsive installations entitled “Land, Sea, Air” until September 6th.
One of the three exhibits is “Prana”- an inflatable dinosaur that measures and visualizes the quality of air in Huntington Beach. Every ten seconds, Prana collects new data from the cross-government agency website airnow.gov,  and changes color (utilizing an internal light) from green to red based upon the information it receives.

You can view a gallery of the exhibit here.
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Cleaning the Air With Plants Yields Dramatic Results
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Plantagon: Urban Greenhouses

Cleaning the air with plants is not necessarily novel news, but a TED 2009 presentation has shown just how powerful this natural method can be. Kamal Meattle explained his experiment which used 3 plants known for their air detoxing capabilities to scrub up the polluted interior air at the Paharpur Business Centre and Software Technology Incubator Park in New Delhi, India. The results were nothing short of amazing.
The New York Times explains:
At about four plants per occupant (1200 plants in all), the building’s air freshened considerably, and the health and productivity results were staggering. Eye irritation dropped by 52 percent, [...]