Range of sound levels in the outdoor environment
01 Jan 1977-Vol. 25
TL;DR: In this paper, the reliability of various noise-measurement and evaluation methods is discussed in terms of planning needs, and various measures from multidimensional rating methods such as the Composite Noise Rating are examined, along with the trend towards single-number rating schemes.
Abstract: Current methods of measuring and rating noise in a metropolitan area are examined, including real-time spectrum analysis and sound-level integration, producing a single-number value representing the noise impact for each hour or each day. Methods of noise rating for metropolitan areas are reviewed, and the various measures from multidimensional rating methods such as the Composite Noise Rating are examined, along with the trend towards single-number rating schemes. The reliability of the various noise-measurement and evaluation methods is discussed in terms of planning needs.
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TL;DR: In this paper, a review of the main transport noise indicators, both the general acoustic ones and those used for specific transport modes, is presented, with a critical analysis of the strengths and weaknesses of these indicators, as well as a section discussing the framework in which they work.
17 citations
TL;DR: In this paper, a simple but robust field test based on responses of swarming mosquitoes to sound stimulation, but not limited to the attraction response, was designed to report the auditory thresholds over a wide range of sound frequencies measured in the field from swarms of Aedes communis mosquitoes.
7 citations
01 Dec 2019
1 citations
07 Dec 2019
TL;DR: It is concluded that clustered and intermixed development of the residences and industries in the same area can create significant noise hazards for the residential areas.
Abstract: This study investigated the intrusion level of industrial noise from five factories in 40 surrounding residences in Anambra state, Nigeria as an effect of settlement pattern and land use planning. Three categories of measurements were considered: engagement of electric power generators, job operation dependency on the national on-grid connection – Power Holding Company of Nigeria (PHCN), and off-work hours. All measurements were conducted in compliance with the Nigerian Environmental Standards and Regulation Enforcement Agency using a digital sound level meter. A-weighted equivalent sound pressure level (LAeq) for the measured noise levels at each assessed residence was evaluated. The result showed the following LAeq value ranges: 63.2 - 78.7 dBA for factory operations during generator use; 44.5 - 62.9 dBA for PHCN use; and 41.1 - 59.7 dBA for off-work hours. Based on the recommendations from the World Health Organization and the US Department of Housing and Urban Development for acceptable noise levels in residential areas, the analysis of the data showed that significant unacceptable noise levels were present only during generator use, leading to issues of temporal hearing impairment and moderate to serious levels of annoyance. The multiple independent t-tests analyses of the LAeq categories disclosed p < 0.05 – significant in all cases. This study concluded that clustered and intermixed development of the residences and industries in the same area can create significant noise hazards for the residential areas.
1 citations