Top Chinese and multinational companies have failed to comply with a rule requiring enterprises on the mainland to release key pollution information, a Greenpeace report said. At least 18 companies either on last year's Fortune Global 500 or the China 100 list had failed to comply with the Ministry of Environmental Protection rule that took effect in May last year, it said. The report also blamed local officials for failing to rein in polluting enterprises using the rule, which had been hailed as a landmark step towards curbing industrial pollution. It came amid growing disappointment from mainland environmentalists who said poor law enforcement and lax standards had become key obstacles to Beijing's efforts. Under the rule, firms blacklisted by local governments for exceeding emissions standards should publish their pollution data within 30 days. But the international green group said multinational corporations such as Shell, Samsung Electronics, Nestle, Kraft and Motorola, and mainland giants such as Sinopec and China Shenhua Energy, had done poor jobs so far. 'It is shocking that these companies, which are leaders in their respective industries, did not even manage to obey the most basic environmental regulation in China,' said Ma Tianjie, a campaigner for Greenpeace China. 'The public has a right to know about what these corporations are discharging in the rivers and lakes around their communities and what risks they face.' But he admitted the group's investigation did not cover hundreds of thousands of smaller mainland polluters, which contributed most to the country's extreme degradation. The report and lawyers also said serious flaws in the rule had prevented it from being effective. While the regulation states 'seriously polluting companies' should disclose pollution information, it fails to define the phrase clearly or address ambiguities such as specifying the pollutants covered and where information should be published. Local authorities contacted by Greenpeace usually defended the polluting companies, the report said. 'They either said some pollution data was classified information or insisted there was no need for enterprises to publish details of pollutants as long as the government received regular reports,' Ma said. Most companies named and shamed in the report insisted yesterday they had not violated the rule. 'Our green standards in China are as strict as those we maintain around the world,' Liu Xing, a spokeswoman for Kraft Foods, said. She said the company had tightened pollution emissions standards after a Kraft factory was blacklisted last year by Tianjin Economic-Technological Development Area authorities. Officials had removed the factory from the list of polluters after recent inquiries, she said. Representatives of Shell and Nestle also said pollution problems, which had once been found in some specific factories, had been dealt with properly. Chen Lei, at US semiconductor manufacturer Motorola, said although one of its factories had breached pollution standards, it had occurred in January last year, months before the rule was adopted. But Ma Jun, head of the non-governmental Institute of Public and Environmental Affairs, said enterprises were required to publish details of pollutants they discharged even if their pollution problems were solved. 'I can't imagine how the regulation can be enforced if top companies do not take the lead,' said Ma, who created the mainland's first water-pollution map. Professor Wang Canfa, an environmental expert at the China University of Political Science and Law in Beijing, said local officials had failed in enforcement.