BEIJING — Improving air quality in China's cities is Job One for the State Quality and Technical Supervision Admin. (SQTSA). Four new standards, applied to a range of vehicles manufactured after Jan. 1, 2000, are being implemented to tighten controls over vehicle exhaust emissions. Liquefied petroleum gas vehicles, compressed natural gas vehicles and those powered by diesel engines also are subject to regulation. The current standards, issued 10 years ago, are being updated as vehicle ...

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