China will adjust its export controls on helium in response to changes in domestic and global supply conditions, after temporarily suspending overseas shipments of the gas last week amid a tightening global supply situation. The Ministry of Commerce said the temporary export ban was in line with the country’s foreign trade laws and World Trade Organization rules. “China is a major importer of helium,” ministry spokesman He Yadong said, adding that the temporary ban was to “safeguard domestic...