But air quality remains such a large problem that officials are also preparing contingency plans that could force factories across much of northern China to close temporarily if conditions warrant.

然而，空气质量依然是一个大问题，因此官方还制定了一项预案，在必要时，强行临时关闭华北大部分地区的工厂。

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Q: China is celebrating the 60th anniversary of the founding of the PLA Air Force. Could you update us on the celebrating events?

问：中国正在庆祝空军建军60周年，你能否介绍有关情况？

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In May, Fali Homi Major, then India's air force chief, said China posed more of a threat than Pakistan to his country.

FORBES: New Asia

On paper, China already has a large air force and navy, but much of their equipment is based on obsolete Soviet designs of the 1950s and 1960s.

ECONOMIST: China

Today, China is still a major supplier to the Pakistani Air Force, even if other divisions of the military enjoy closer cooperation with the United States.

FORBES: China's 'String of Pearls' - Real or Fake?