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PetroChina

As its name suggests, PetroChina Company Ltd is the listed arm of state-owned China National Petroleum Corporation (CNPC). It is China's biggest oil producer, and is listed in Hong Kong, New York, and Shanghai.

The Chinese government, as part of its measures to reduce air pollution this winter, has put curbs on the use of coal for heating. Photo: AP Photo

Gas companies sole beneficiaries of Beijing’s drive for cleaner air

A natural gas shortage this winter – fuelled by Beijing’s war on air pollution – has left some villages in northern China out in the cold, even as gas producers benefit from higher charges made possible by a loosening of the government’s grip on prices they had been longing for years.