Key information on the environmental impact of the mainland section of the Hong Kong-Zhuhai-Macau bridge is not available for public scrutiny, even though its construction might have serious implications for the endangered Chinese white dolphin, WWF Hong Kong says. The Advisory Council on the Environment, which is advising the Environmental Protection Department on whether to accept an environmental impact assessment report, will give its assessment of the bridge project on Monday. A month ago, a subcommittee under the council expressed reservations about the bridge's impact on air quality and marine ecology. The council can only approve when it is satisfied with the Hong Kong section, comprising a 138 hectare border crossing, a 12 kilometre link road and another road link between Chek Lap Kok and Tuen Mun. But the main part - the 30 kilometre bridge and tunnel structure spanning the Pearl River estuary, with two artificial islands, one just 150 metres away from the western sea boundary of Hong Kong - was never within the power of the advisers to scrutinise. A person familiar with the situation said environmental laws barred the advisers from giving views on work outside Hong Kong. Access to the full assessment report conducted by the mainland was limited, he said. He said a summary report of just 50 pages - compared with the more than 5,000 pages of the Hong Kong-section report - was only recently circulated to the members of the advisory council after requests. The report had little data or details about the construction. Dr Alan Leung Sze-lun, a senior conservation officer with the Hong Kong branch of global conservation body WWF, urged the advisory council to reject the report unless the entire project's impact on the rare dolphin, known for its sometimes pink skin, was fully addressed. He said building the artificial islands would involve dredging that might increase the level of suspended solids in the water which could spill across the border into waters off west Lantau, which the dolphins frequently used. 'There is also no information about how to handle pollution on breaches.' Leung said a cross-border team should be set up to monitor the project closely.