AN environmental concern group has vowed to be a ''green monitor'' of all district board candidates. Green Power will run a yearly assessment, checking the candidates' consciousness and performance on environmental protection before and after the election next month. The assessment, which started yesterday, will open with a questionnaire covering all 762 candidates. The studies aim at analysing the candidates' consciousness and policy inclination on green issues and the results, to be announced on September 15 - three days before the poll - will be used as an indicator for voters. Green Power's vice-chairman, Man Chi-sum, said: ''We hope, through the survey, voters will be able to understand their candidates from a new perspective. ''We also want to remind candidates that promises made during the election campaign have to be fulfilled afterwards,'' he said. The group, with the help of environment and social administration specialists from major tertiary institutions, will assess members' performance throughout the year. ''According to conservative estimates, the 762 candidates are likely to produce a total of 3.8 million pamphlets, with around 5,000 each, and 760,000 posters, with 1,000 each. ''The production will cost nature approximately 1,000 small trees,'' he said.