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This two-year study presents the average experimental results/data obtained from twelve (12) scientific investigations sequentially conducted on the noise-levels of electric-power generators used in seven (7) major cities—[Abuja, Makurdi, Lokoja, Ilorin, Lafia, Minna and Jos] of North-Central Nigeria. Fifty (50) popular models of electric-power generators produced by ten (10) leading generator-brands which were imported to, and used within the study-area were first identified. Then, using the 811 CR C Noise meter, the Perceived Noise Level (Lm) Sound Pressure Level LP and Sound Power Level (SWL) of each of the fifty electric-power generator-models were obtained twelve times through field measurements and computation; in addition to recording the ‘Usage time-periods’ and ‘Rated electric-powers’ during each investigation. After which, a collation and graphical illustration of the respective average values obtained, showed that: majority (80%), two-thirds (66%) and below half (42%) of the total number of tested electric-power generator-models used (operated) in the study area did not conform to three (3) international noise emission requirements, like LP values greater than 85db, 87db and 90db: since most of the generators exceeded the standard 8-hour Recommended Noise Level (PNL) specified by NIOSH, IOSH and OSHA, for human safety respectively. Without doubts, this poses a serious health risk to the millions of people presently living in these North-Central Nigerian cities.

Noise-level Characterization of Portable Electric-power Generators in North-Central Nigeria: A Brand-by-Brand Comparative-study