Pearl River Delta region (PRD)

The Pearl River Delta region (PRD), which is the second largest delta in China, has been one of the fastest growing economic areas for nearly 30 years and among the most polluted areas in China. PRD has a total land area of only 8000 km² and a high population density. It is home to multiple mega cities including Guangzhou, Hong Kong, Shenzhen, Dongguan, Zhuhai, and Foshan. PRD is the biggest cities clusters in China. The urbanization in the PRD has led to vegetation reduction, increased demand in transportation, and bloom of township enterprises, which in turn have resulted in increasingly frequent air pollution episodes.