Understanding Noise Induced Permanent Threshold Shifts (NIPTS)
Noise Induced Permanent Threshold Shifts (NIPTS) refers to the lasting damage to hearing caused by exposure to loud noise over time. It specifically means a permanent change in the hearing threshold, which is the quietest sound a person can detect.
Identifying the Causes of NIPTS
The primary cause of NIPTS is prolonged exposure to high levels of noise. This type of noise exposure often occurs in environments such as:
- Industrial workplaces (factories, construction sites)
- Military settings
- Concert venues
Over time, continuous exposure to these loud sounds can damage the sensitive hair cells in the inner ear (cochlea), leading to irreversible hearing impairment.
Analyzing the Options Provided
Let's evaluate each option in the context of NIPTS:
-
Option 1: Shift due to exposure to high level sound for comparatively short period
This describes a Temporary Threshold Shift (TTS), where hearing sensitivity reduces after noise exposure but recovers over time. It is not permanent.
-
Option 2: Shift due to honking of vehicles
While the honking of vehicles is a source of noise, this option is too narrow. NIPTS typically results from consistent, long-term exposure to high noise levels, not just occasional loud sounds like honking, unless exposure is extremely frequent and prolonged over many years.
-
Option 3: Shift in permanent threshold due to years of high level of industrial noise
This option accurately defines NIPTS. It correctly identifies the cause (high level of industrial noise), the duration (years), and the outcome (permanent threshold shift). This is the most fitting description.
-
Option 4: Shift due to shorter noise exposure
Similar to Option 1, this points towards a temporary effect. NIPTS requires chronic exposure, not short-term exposure.
-
Option 5:
This is an empty option and does not provide any relevant information.
In summary, NIPTS is specifically the permanent hearing damage resulting from long-term exposure to loud noise, often associated with industrial environments.
Important Questions from Air and Noise Pollution - Teaching
Statement (I): The impact of Green House Gas emissions on the environment may comprise an accelerated increase in global warming as well as a significant rise in mean sea levels.
Statement (II) : Green House Gas omission is responsible for decreased landmasses, increased population densities, and food shortages.
Choose the correct statement from the following:
The equivalent noise level is significant for the following:
- Electrostatic Precipitator is used in Thermal Power Plants to remove which of the following air pollutants?
If [$_env$ < [$_d$ ,where [$_env$ and [$_d$ are environmental & dry adiabatic lapse rates respectively ,which of the following types of plume emitted from a stack of a thermal power plant is observed ?
- The photodissociation of $NO_{2}$ yields which oxygen species ?
