Starting Wednesday, Disney began fireworks tests for seven nights over the next two weeks. Results for air quality and noise levels will be collected from the first four tests and data from ``the worst case'' will be scrutinized by the Environmental Protection Department, said a Disney spokeswoman.

But Friends of the Earth director Mei Ng, also a member of the government's Advisory Council on the Environment, wants more transparency from the department regarding the tests. She said the department should insist on Disney providing results from all seven tests.

``The EPD should provide data of all the firework tests to ACE instead of just one night's data based on a worst-case scenario,'' her group said.

Hong Kong University mechanical engineering associate professor Leung Yiu-cheung, who witnessed the trial Wednesday, agreed, saying a one-night result is ``definitely not enough'' and ``not comprehensive,'' although he said Wednesday's noise levels were ``satisfactory.''

The plans for nightly fireworks at Penny's Bay have raised the hackles of some residents in Discovery Bay and Peng Chau. After Disneyland's two-day fireworks trials in May, the Islands District Council received 31 complaints.

The department ordered Disneyland to undertake an additional monitoring program this month after results from the May trials were criticized as flawed because an instrument to measure particulates failed during one of the trials, while results for respirable suspended particulates were gathered on an untypically calm night.

Friends of the Earth wants Disney to provide a comparison of air and noise pollution caused by the use of different fireworks technology at its Hong Kong and California theme parks.

Its call follows a Standard report that Hong Kong Disneyland is reluctant to introduce environmentally-friendly fireworks used in California.

chester.yung@singtaonewscorp.com