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A reading above 50 indicates expansion, while a reading below 50 reflects contraction.
The figure dropped amid the continuous impact of heat wave and rainstorms on manufacturing activity, NBS senior statistician Zhao Qinghe told a state-controlled news agency.
The manufacturing sector climate was also affected by the arrival of off-season period for some industries, he said.
The sub-indices for production and new orders both dipped in August.
Fibre2Fashion News Desk (DS)