He said the whole world wanted such measures because "an accident similar to the Chernobyl nuclear disaster must be averted".

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Zhong Dajun, head of an independent research institute in Beijing, wrote last month that the Yangtze delta was now more attractive to migrants thanks to measures aimed at ensuring they receive accident and health insurance and other benefits.

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Since the accident, the cruise line industry has been under pressure to improve safety measures in place during emergencies.

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After that accident, there was a temporary suspension of hot air balloon flights while safety measures were improved.

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