Carbon dioxide emissions from Beijing's major polluters fell 4.5 percent in 2013 as a nascent emissions trading scheme cut compliance costs for firms, the Chinese capital's municipal government said on Monday.

Beijing is one of seven cities and provinces in China that have launched pilot emissions trading schemes ahead of a national market to be launched in the world's biggest-emitting nation in 2016.

The Beijing market began in November, but with caps on CO2 emissions for participating companies backdated to the beginning of the year.

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