Question: What risks are associated with using an expired respirator?

Answer passage (source: CDC):
page_title: Personal Protective Equipment: Questions and Answers
section_headers: Respirators
My N95 respirator has an exhalation valve, is that okay?
section_content: An N95 respirator with an exhalation valve does provide the same level of
protection to the wearer as one that does not have a valve. The presence of an
exhalation valve reduces exhalation resistance, which makes it easier to
breathe (exhale). Some users feel that a respirator with an exhalation valve
keeps the face cooler and reduces moisture build up inside the facepiece.
However, respirators with exhalation valves should not be used in situations
where a sterile field must be maintained (e.g., during an invasive procedure
in an operating or procedure room) because the exhalation valve allows
unfiltered exhaled air to escape into the sterile field.

Reviewer feedback on this answer:
Discusses respirators with and without safety valves, but doesn't mention the risks of expired respirators.
This answer is irrelevant to the question. The question is asking about the potential risks of using an expired respirator and the answer is providing explanation about the different level of protection of N95 respirator with and without an exhalation valve.

Reviewer ratings:
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Answer passage (source: CDC):
page_title: Personal Protective Equipment: Questions and Answers
section_headers: Respirators
What do I do with an expired respirator?
section_content: In times of increased demand and decreased supply, consideration can be made
to use N95 respirators past their intended shelf life. However, the potential
exists that the respirator will not perform to the requirements for which it
was certified. Over time, components such as the strap and nose bridge may
degrade, which can affect the quality of the fit and seal. Prior to use of N95
respirators, the HCP should inspect the respirator and perform a seal check.
Additionally, expired respirators may potentially no longer meet the
certification requirements set by NIOSH. For further guidance, visit Release
of Stockpiled N95 Filtering Facepiece Respirators Beyond the Manufacturer-
Designated Shelf Life: Considerations for the COVID-19
Response .

Reviewer feedback on this answer:
Describes the risks associated with using expired respirators and circumstances in which doing so is justified.
This information answers the question directly. It provides explanation on the performance and quality of N95 respirators when used past their intended shelf life.

Reviewer ratings:
Excellent
Excellent

Answer passage (source: CDC):
page_title: Personal Protective Equipment: Questions and Answers
section_headers: Respirators
How do I know if my respirator is expired?
section_content: NIOSH does not require approved N95 filtering facepiece respirators (FFRs) be
marked with an expiration date. If an FFR does not have an assigned expiration
date, you should refer to the user instructions or seek guidance from the
specific manufacturer on whether time and storage conditions (such as
temperature or humidity) are expected to have an effect on the respirator’s
performance and if the respirators are nearing the end of their shelf life.

Reviewer feedback on this answer:
Cautions against using expired respirators, but
This does not answer the question. The answer does not provide any information on the potential risk of using an expired respirator. Instead, it provides information regarding expiration date of a respirator.

Reviewer ratings:
Bad
Bad