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"Each country should have a policy to consider how to evaluate investment projects prior to implementation," he said. "We must ensure that investments are aligned with our sustainable development goals."

"Even if the old regulation were in place, it is not legally binding," he said.

"Farmers used to throw them on the road or in the rivers," Phatinisiri said. "But now they sell them to me to earn extra money."

"Digitalization, internet and intelligent will lead the future development of manufacturing, and AI makes intelligent manufacturing possible," said Wu Hequan, an academician at the Chinese Academy of Engineering.

"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.