This study comprised three objectives that is subjected to low frequency noise control. First, one objective was to propose the draft standards of low frequency noise for construction sites, in order to control all the low frequency noise from such as business places, establishment and factories of noise sources which Noise Control Standards stipulated. Second, the low frequency noise standard of factory that will implemented since January 1 , 2008, the other objective of this study was to provide help with field survey of some factories and measure low frequency noise in some spots of concern then offered the guidance report in accordance with the noise state. Third, after the guidance and inspected the problems and important content that regulation revise while being aforesaid, three meetings were held which invited the society and factory industry in northern, middle and southern part of Taiwan. In the study of low frequency noise in 2005 and 2006, the low frequency noise were measured in forty construction sites, and a draft standards of low frequency noise for construction sites was proposed in 2007. This annual plan lasted to carry on the measurement of low frequency noise of twenty construction sites to examine and study to the draft standards limit to be more representative. Sum up the measure results of 2005, 2006 and 2007, amounted to 60 sites, with the door and windows closed and measured indoor, the low frequency noise of equivalent energy sound level of 2 minutes (20-200Hz ), if it is 49 dB(A), nearly 27.3% will go beyond this standard value. This result is similar with the results in the past two years. The draft was present in the public hearing on 14, DEC, 2007 of "Noise Control Standard article 2 , article 4, 1 of article 6 revise draft ". In field survey of twenty factories, the experts invited to provide suggestion in the factories and the measure results revealed that some low frequency noise measured indoor were lower than 47 dB(A), which is the proposed limit in category 3 daytime. In the final stage of this study, the factories were invited to join the three conferences which held in Taipei, Taichung and Kaohsiung. In the meetings, the regulation and method of low frequency noise engineering were illustrated.

Low Frequency Noise,Noise Control,Noise Criteria