China's top economic planner on Tuesday pledged to closely monitor the price changes of bulk commodities and take multiple measures to ensure price stability as part of efforts to alleviate burdens on businesses over raw material costs.

The measures include boosting production and supply, timely release of reserves, strengthening coordination of imports and exports and stepping up market supervision, said Meng Wei, spokesperson for the National Development and Reform Commission.

China has released 270,000 tonnes of copper, aluminum and zinc from its national reserves in two tranches to maintain market order.

The move has helped guide market expectations and ease business pressures over raw material cost, Meng said.

Earlier official data showed China's producer price index (PPI), which measures costs for goods at the factory gate, had expanded by 9 percent year on year in July, slightly higher than the 8.8-percent growth in June.

Sharp price hikes in crude oil and coal lifted year-on-year PPI growth in July. However, month-on-month data showed that government policies to stabilize commodity prices took effect, with mild price declines seen in industries like steel and non-ferrous metals, the National Bureau of Statistics said.

Read more:

China's economic recovery continues in July, but industrial output, retail sales growth slow