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The high, medium, and low method--a better noise reduction rating?

¹Ontario Hydro, Pickering, Canada.

American Industrial Hygiene Association Journal

|December 1, 1990

Summary

The High, Medium, and Low (HML) method offers an acceptable and simpler alternative for calculating hearing protector attenuation compared to the National Institute for Occupational Safety and Health (NIOSH) long method.

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Area of Science:

Occupational health
Acoustics
Audiology

Background:

Hearing protector effectiveness is crucial for industrial hearing conservation.
Accurate attenuation calculations are needed to select appropriate hearing protection.
Existing methods like the NIOSH long method can be complex.

Purpose of the Study:

To compare the accuracy of the High, Medium, and Low (HML) method against the National Institute for Occupational Safety and Health (NIOSH) method No. 1.
To evaluate the HML method's suitability as an approximation for NIOSH calculations.
To determine the HML method's preference over the Noise Reduction Rating (NRR) for industrial applications.

Main Methods:

Calculated hearing protector attenuations for 144 noise-protector combinations using both NIOSH method No. 1 and the HML method.
Quantified the differences in attenuation values between the two methods.
Assessed the accuracy of the HML method relative to the NIOSH method.

Main Results:

The HML method generally yielded lower attenuation values than the NIOSH method.
Observed differences between HML and NIOSH calculations were within typical field measurement errors.
The HML method demonstrated higher accuracy compared to the Noise Reduction Rating (NRR).

Conclusions:

The HML method is a viable and acceptable approximation of the NIOSH method for calculating hearing protector attenuation.
The HML method's simplicity makes it advantageous for practical use in industrial settings.
The HML method is preferable to the NRR for industrial hearing conservation programs due to its accuracy.

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