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"Every relation has both opportunities and challenges. The wisdom is how to cooperate overcoming the challenges," said Chung.
"Everybody can sell air purifiers when you have PM2.5 at 300 outside for two weeks, because it does not need a great company to achieve that," said Frank Hammes, CEO of Swiss air purification provider IQAir.
"Domestic policies will, to a large extent, be dependent on the China-US trade tensions," he added.
"Daily air passenger trips during the holiday equaled 91 percent of last year's daily air travel over the same period," it said.
"Everything is hand-made, some with thin steel bars and others with fibre glass and galvanized wire, so it's been a very labor-intensive process. Social distancing meant we couldn't even work together in big groups, pieces had to be made in isolation and then brought together for assembly, but we're really pleased with how it's turned out and how it's been received."