Kerketta et al. [63]conducted noise monitoring in a Chromite mine, Sukinda Valley,
Jajpur District, Odisha, India. They made statistical analysis and found that Leq had
greater effect in the evening at the workshop and similarly, the Leq at the air field had
greatest effect in the afternoon at 1% level of significance attributed primarily to the
heavy traffic density. They concluded that the equivalent noise levels were not the same
with respect to the time of day and also at the ambient air quality stations. The Leq
level at the workshop , the industrial area, had the greatest effect in the evening. The
Leq levels during the time of monitoring did not exceed the prescribed limits at all the
locations. They also recommended the following recommendations:
• Because the workshop was one of the most affected industrial areas, the older
workers should be regularly changed to work in the less influenced areas to avoid
occupational hearing loss.
• Ear protective devices should be worn by all the workers in the work zone areas.
In particular, ear protective devices should be required for those working in the
workshop.
• For those who primarily work in the work shop, regular use of ear protective devices
should be practiced in general and should be mandatory in the evening.
Smith and Sapko [64] determined the extent of the hearing loss hazard from intense noise
sources and developed the basic knowledge required to reduce the hazard through effective
control technology and training. According to them, impulse noise sources exist
throughout the mining and construction industries. There is very little data on blasting
in underground complexes, e.g., tunnels and mines. They stated that impulse noise from
blasting in an underground mine differs from that on the surface and is strongly influenced
by mine geometry, openings, and wall roughness. As per their conclusion, in a mine