The government said on Wednesday that it will consider asking suppliers of non-plastic tableware to voluntarily submit quality and safety certificates, amid concerns that some products could contain carcinogenic substances.

Green groups have cited overseas studies as showing that some non-plastic utensils and food containers, including some made from paper, wood and bamboo, have been found to contain the "forever chemicals" PFAS, which have been linked to cancer and fertility issues.

Environment Secretary Tse Chin-wan said officials are aware that there have been public concerns about the quality and safety of such products since a ban on single-use plastic items came into effect last month.

In a written reply to a question from lawmaker Chan Siu-hung, Tse said the authorities don't demand information on any PFAS content in non-plastic tableware.

"To provide better services to the public and the trade, the government will consider inviting suppliers to voluntarily submit relevant certificates or documents, and listing out non-plastic tableware with these certificates or documents for reference," Tse said.

He also cited international research organisations as saying PFAS only pose a very low risk to people's health when products only contain trace amounts of the substances.