Cheonggyecheon has had positive environmental impact
I first heard about Cheonggyecheon from Adam Greenfield's presentation at Dot Dot Dot. I didn't know that this project had an environmental impact. This project was called "Daylight" and costed $384 million to recover and filter streams. Since the completion of this project in 2005, "Daylight" has reduced temperature and air pollution.
Small-particle air pollution dropped to 48 micrograms per cubic meter from 74 along the corridor, and summer temperatures are now often five degrees cooler than those of nearby areas, according to data cited by city officials.
To read more about this, visit NYTimes site here.