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Short answer
“Noise-cancelling” ear plugs are earplugs or earbuds that use electronics to cancel sound. NIOSH says that active noise cancellation “should not be considered hearing protection unless labeled with an NRR” (Noise Reduction Rating). So the label, not the marketing term, shows whether a product counts as hearing protection. This page is general information, not medical or occupational-health advice.
It explains, for lab and clinic staff, what the wording “noise cancelling,” “noise reducing” and “sound reducing” does and does not tell them about a product.
Definition and scope
The NIOSH hearing protection page describes active noise cancellation this way: “A process called active noise cancellation reduces noise by using electronics to cancel noise out.” NIOSH notes it can be added to headphones or earbuds. In this sense, “noise cancelling” (also spelled “noise canceling”) names a method that needs electronics, not a measured level of protection.
Searchers also use “noise reducing ear plugs,” “noise reduction ear plugs” and “sound reducing ear plugs.” None of these phrases is a defined category in the NIOSH page or in the US federal hearing protector labeling rule (40 CFR Part 211 Subpart B). They are descriptive phrases. The regulation defines a hearing protective device only broadly, as “any device or material, capable of being worn on the head or in the ear canal,” and the text of that subpart does not mention active or electronic devices, so it should not be read as either covering or excluding them.
How it works in practice
In practice, the electronics are one feature of a product, and the label decides whether it counts as hearing protection.
Active noise cancellation
Electronics cancel noise. NIOSH’s caution is that such a feature is not hearing protection by itself unless the product carries an NRR.
Types and related concepts
Level-dependent (electronic) protectors
NIOSH groups electronic, level-dependent and sound-restoration protectors as non-linear: they “allow quiet sounds to pass through but block loud sounds.” NIOSH points to them as useful for intermittent exposures.
Communication protectors
Communication hearing protectors have built-in microphones and speakers so wearers can talk to coworkers.
| Wording or design | What NIOSH says | What it does not settle |
|---|---|---|
| Active noise cancellation | Uses electronics to cancel noise; can be added to headphones or earbuds; not hearing protection unless labeled with an NRR | Whether a given product has an NRR |
| Level-dependent / sound restoration | Non-linear: quiet sounds pass, loud sounds are blocked; useful for intermittent exposures | How much protection a given model gives a given wearer |
| Communication protectors | Built-in microphones and speakers for talking to coworkers | Protection level, which is a separate question from the communication feature |
For passive earplug, earmuff and canal-cap categories, see hearing protection types.
The label test: does the product carry an NRR?
Under 40 CFR Part 211 Subpart B, the label shows the NRR in decibels for the model, and the value may not exceed the one computed under section 211.207. The attenuation is measured by the real-ear method in ANSI S3.19-1974 (section 211.206-1(a)). The label statement also says that “The range of Noise Reduction Ratings for existing hearing protectors is approximately 0 to 30.”
Putting that together with NIOSH’s statement gives a practical decoder for product wording: “noise cancelling” describes how a product works, while an NRR on the label is what NIOSH treats as the sign that it should be considered hearing protection. For how the number is applied, see noise reduction rating for earplugs and the comparison NRR vs SNR.
Where it matters for labs and clinics
- The NRR on the label. A product advertised only as noise cancelling, with no NRR, should not be considered hearing protection according to NIOSH.
- The printed NRR has limits. NIOSH says manufacturers print an NRR but “this often does not reflect the actual protection provided for each worker.”
- Fit matters. NIOSH points to individual hearing protector fit testing as the way to check the protection a worker actually gets.
- Match the feature to the task. Communication models address talking to coworkers; level-dependent models pass quiet sounds and block loud ones. These are features, and neither replaces the label check.
Workplace hearing-protection duties sit within the wider PPE framework; see the OSHA PPE standard and PPE types guides.
Common misunderstandings
- “Noise cancelling means hearing protection.” Per NIOSH, not unless labeled with an NRR.
- “Noise reducing and noise cancelling are the same.” They are not defined as the same thing in the NIOSH page or the federal rule; the first is a general description, the second names an electronic process.
- “The NRR on the box is what I will get.” NIOSH says the printed value often does not reflect actual protection for each worker.
- “Federal rules say whether electronic devices count.” The text of Part 211 Subpart B does not mention electronic devices.
FAQ
Are noise-cancelling ear plugs hearing protection?
Only if labeled with an NRR, according to NIOSH. Active noise cancellation alone should not be considered hearing protection.
What is the difference between noise cancelling and noise reducing ear plugs?
Noise cancelling refers to an electronic process that cancels noise. “Noise reducing,” “noise reduction” and “sound reducing” are descriptive phrases without a definition in the NIOSH page or the federal rule; the NRR on the label is the item to look for.
Is “noise canceling” spelled differently from “noise cancelling”?
Both spellings are in use, and NIOSH’s page uses the American “canceling” in its process description. They refer to the same idea.
How is real protection checked?
NIOSH points to individual fit testing, because the printed NRR often does not reflect actual protection for each worker.
Sources
- NIOSH, Hearing protection / personal protective equipment, cdc.gov/niosh/noise/prevent/ppe.html (page last reviewed January 31, 2024; checked October 30, 2026).
- US EPA, 40 CFR Part 211 Subpart B, Hearing Protective Devices, eCFR (sections 211.203, 211.204-1, 211.206-1, 211.207; checked October 30, 2026).
