Chief Executive John Lee said on Thursday that officials will role out a development strategy on hydrogen next week, involving the development of hydrogen energy and vehicles powered by the gas.

During a question and answer session in Legco on the country's initiatives to develop new quality productive forces, Lee said the Environment and Ecology Bureau will announce its hydrogen plan on June 17.

He said some laws may have to be changed to allow the safe storage and maintenance of the gas, which is easily combustible.

Lee said the government will look into new facilities such as hydrogen gas stations, and officials have already approved several pilot schemes involving hydrogen-powered vehicles.

"We already have [hydrogen fuel cell, HFC] buses on trial now running on the streets, and you will also be seeing the launch of several other projects," the CE said.

"For example, we have plans to launch a trial project on HFC street washing vehicles, refuse collection vehicles and trams and so on. There will be trial projects too using hydrogen energy."

The chief executive also said the government is facing problems developing a "low-altitude economy", which is currently popular on the mainland, noting that the SAR is filled with high-rise buildings.

The DAB's Elizabeth Quat said there are several things Hong Kong can look into, such as helicopter transit services from the airport directly to business buildings in the Greater Bay Area, local food delivery with drones, and low-flying air tours for travellers.

Meanwhile, the legislature also discussed the development of cultural tourism in Hong Kong.

Councillor Kenneth Lau, who heads the Heung Yee Kuk, proposed that the government give more funding to rural committees to promote rural cultural activities to tourists, as in-depth cultural tours are becoming more popular.

Lee agreed that rural representatives know how to design travel itineraries, and government sponsorship would depend on particular projects.

For his part, lawmaker Gary Zhang, who used to work at the MTR Corporation, said there are many transport enthusiasts in the Greater Bay Area interested in the local transport culture.

He called on the authorities to build an extra rail line connecting the planned Hung Shui Kiu Station with Sunny Bay and the Airport Express, so that travellers can get to Lantau and the airport easier.

The CE said he agreed with connecting the Airport Express to more lines, saying officials will seriously look into whether this would be feasible.