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Yunnan is China's second most heavily-forested province, with a total forest coverage of 47 percent.

Stressing the focus is on improving air quality rather than its monitoring, Wu said his ministry is working on a five-year plan for air pollution prevention and control in key regions, aiming to reduce the amount of fine particles in the air by strengthening controls over industrial waste treatment and auto emissions.

China will promote the application of "Internet-of-Things" technology, under which individual items are recorded and logged online, and improve the information service mechanism that tracks food producers, according to the plan.

Those who refuse to cooperate in the investigation and try to cover up malpractice will be severely punished, the statement said.

China entered its first offer to join the pact in 2007, but it was turned down as the offer did not include local governments' spending.