"One crucial thing (to control pollution) is to reinforce the supervision over the industrial sector, especially that related to the disposal of industrial wastes. I mean gases, liquids and solids. Another measure is to stimulate public transportation and set up green attitudes of citizens."

Gaio Doria, 27, from Brazil, second-year doctoral student at Renmin University of China, in socialism with Chinese characteristics

"Everyone has a responsibility to protect our environment. If everyone could put his or her rubbish in the garbage bin, that would be a big help. Beijing's pollution is serious and is caused by millions of vehicles. The government should control the number of vehicles."