"I don't think Beijing has taken enough emergency measures on heavily polluted days. When air quality becomes extremely bad, government and private cars should be banned from the roads, with only public transport and emergency vehicles allowed."

An Jianjun

Political adviser in Beijing, and director of the development planning department of China Economic and Trade Herald, a semimonthly magazine under the National Development and Reform Commission

"Joint efforts with neighboring regions are needed. As far as I know, annual carbon emissions in Beijing have been reduced to more than 20 million metric tons a year, but still stand at about 70 million tons in Tianjin and more than 100 million tons in Hebei province."

Zhang Hao

Political adviser in Beijing, and president of Yisheng Investment Group

"One of the reasons for the serious smog in Beijing's winter is the burning of coal, a practice popular in urban and rural locations. I think the city can ease the pressure by setting up new towns to curb the practice. "

Du Liqun

Political adviser in Beijing, and deputy head of the Beijing Municipal Institute of City Planning and Design

(China Daily 01/23/2013 page4)