Hi, and welcome to the Apple (user-to-user) Community!
Re: "Airpods Pro 3 - MacBook Air - Hearing Health/Test" : "The website references Airpods Pro 3 being supported for hearing assistance etc on Mac computers on Sequoia forwards. I have a MacBook Air and cannot find any way to access any hearing health setup. Digging and digging the website then references the hearing test only on iPhone. Has Apple ignored macOS from being able to initiate setup of the hearing health/hearing aid function?"
Am no expert in this area, yet your request to the community deserves some response:
We are all Apple users, like yourself, in the community, so we can not speak for Apple.
Fortunately, "Apple Support" documents all the "how to" info., and makes that accessible online.
With some of the linked articles you can adjust the MacOS version at the top, to view the most accurate info:
Seems we do need an iPhone or iPad to take the Hearing Test and to Set up and use the Hearing Aid feature.
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However:
Apple Support's online article:Use the Hearing Aid feature on your AirPods Pro 2 or AirPods Pro 3 - Apple Support
Eg: says:
"Hearing Aid settings are stored on your AirPods, so if your paired iPhone or iPad isn't nearby, Hearing Aid will keep working using the most recent settings."
and
"Use Conversation Boost with Hearing Aid
To automatically detect if a conversation is happening in front of you and focus your AirPods Pro on the person speaking to you, turn on Conversation Boost. Conversation Boost is best for one-on-one conversations when the other person is right in front of you.
- On Mac, choose Apple menu > System Settings, click your AirPods in the left sidebar, then click Hearing Health. Click Adjustments under Hearing Aid, then turn on Conversation Boost."
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Seems from the above article, (once the hearing health features are set up using iPhone or iPad),
you can scroll to:
"Set up and use Media Assist" to see how to use that feature on Mac too.
Also: "Adjust amplification level, balance, and more in AirPods Pro settings"
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We don't know which MacOS version is installed on your MacBook Air (or which model it is)
The linked articles below are for MacOS 26 or, for accuracy, you can choose your MacOS version at the top
Use Mic Modes on your Mac - Apple Support
Eg: says "You can adjust the microphone settings on Mac to filter out background sounds or capture the sounds around you. More info. in the above article
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Below are links to some of the earlier hearing features on Mac: from Apple's Mac User Guide for MacOS Tahhoe
All the best :-)