The Liberal Party leader last night vowed to ask Beijing to help improve air quality in the Pearl River Delta region. The call came after legislators from different parties passed James Tien Pei-chun's motion, after amendments, on curbing local and regional air pollution. Mr Tien said he was dissatisfied with the progress made across the border even though Secretary for the Environment, Transport and Works Sarah Liao Sau-tung has tried to explain the difficulties facing Guangdong. 'It appears to me that Dr Liao is powerless on that. I wonder if we can, upon seeking consent from my colleagues, seek help from the central government through the 36 National People's Congress' local deputies,' he said after the motion was passed. Dr Liao said talks on new measures were continuing with Guangdong, and work had progressed. A meeting with provincial officials on regional air-quality management is scheduled for next week. Dr Liao said that apart from co-operation with Guangdong, other local issues needed to be addressed, including pressuring power companies to reduce polluting emissions by using more natural gas. Many legislators, who echoed this view, urged the power companies to develop renewable energy sources locally and reduce the use of coal.