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BEIJING (Reuters) - The search for culprits behind the rancid haze enveloping China's capital has turned a spotlight on the country's two largest oil companies and their resistance to tougher fuel standards.

Bureaucratic fighting between the environment ministry on the one hand and China National Petroleum Corp (CNPC) and Sinopec Group on the other has thwarted stricter emission standards for diesel trucks and buses -- a main cause of air pollution blanketing dozens of China's cities.

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