LETTERS

摘要

In their perspective "clean air for megacities" (30 october 2009, p. 674), d. D. Parrish and T. Zhu highlighted the opportunities and challenges that exist for megacities to address air quality and climate change issues. In China, only 60.5% of the 287 large cities monitored in 2007 had air quality that met the standard of the Ministry of Environmental Protection of China (7). However, there is encouraging evidence that China is striving to build more low-carbon cities. In early 2008, the World Wildlife Fund collaborated on pilot programs with Shanghai and Baoding, focusing on how to implement low-carbon development in China's urban areas (2).