Deal with all polluting sources

Only new vehicles are equipped with exhaust pollution control catalytic converters that reduce the level of emissions. There are many cars, trucks and buses in China that don't have catalytic converters yet, and they cause most of the air pollution among vehicles.

Another source of air pollution in China is coal, which is burned to generate electricity and widely used in other industries. The authorities have to deal with all the sources of air pollution if they want to have permanent blue skies.

A READER, from China Daily website