Air Supply AS-300RB Review: The Little Wearable Purifier Trying to Save Your Airways on the Go

If you’ve ever stepped onto a bus, into a lift, or into that one colleague’s office that always smells like damp carpet and microwaved tuna, you know exactly why personal air purifiers exist. Some people carry hand sanitiser; some carry water bottles; and then there are the people whose lungs demand backup. That’s who the Air Supply AS-300RB by Allergy Best Buys is made for, the commuter, the traveller, the “I-can’t-control-other-people’s-air-but-I-still-have-to-breathe-it” human.

This tiny wearable purifier claims it can clean the air around your face using a stream of high-density ions. Sounds dramatic, but let’s talk about what it actually does, and whether it’s worth clipping to your shirt.

What You Should Know at a Glance

• It’s a wearable, USB-rechargeable personal air purifier designed for your “breathing zone.”

• Best for commuters, travellers, people sensitive to pollen, dust, stale air and crowded indoor spaces.

• Runs up to 28 hours, no filters, silent.

• Helps reduce exposure to airborne irritants, but it won’t replace a real room purifier.

• Worth it if you struggle outside your home. Less useful if your triggers live inside your house.

What This Purifier Actually Is

The Air Supply AS-300RB is basically a mini purifier that hangs around your neck or clips onto your top. It uses ionisation to push cleaner air toward your face, meaning the air you inhale has fewer irritants floating around in it. No fans, no filters, no bulk. You charge it via USB, put it on, and forget it’s there… until you step onto public transport and suddenly feel grateful for it.

It doesn’t promise miracles. It promises “better air than whatever’s around you,” which is exactly the right expectation.

How It’s Built (And Why That Matters)

Unlike most personal gadgets that feel like toys, this one is sturdier than you’d expect.
Here’s what stands out:

• Lightweight stainless steel body, wearable without feeling like a necklace punishment

• Platinum emitter, the part that actually generates ions

• Runs up to 28 hours on a full charge

• Charges in about 3–5 hours

• Ozone output stays below 0.028 ppm (important if you have asthma)

• Zero filter replacements, zero noise, zero fiddling

In plain English?
It’s the kind of device you’ll use more because it doesn’t annoy you.

How It Feels to Use in Real Life

Imagine a gadget that just… does its job without asking for attention. That’s this purifier.

Wear it on a train? Fine.
Clip it onto your work top? Fine.
Hide it under your jacket? Still fine.

Because there’s no fan, you don’t hear or feel anything. And because there’s no filter, you don’t add “purifier parts” to your forever-growing adult shopping list. If you’re someone who hates devices that require constant “care,” this one is refreshingly low-maintenance.

But the key thing: it only purifies your immediate breathing space, not the entire room. Think of it as your own personal air bubble, not a forcefield.

Is It Powerful Enough to Matter?

Depends on where you use it.

Where it performs really well:

• On public transport

• In offices with questionable ventilation

• In waiting rooms (especially during cold/flu seasons)

• In older buildings where dust loves to live

• While travelling (flights, hotels, airports)

You know the places.
The air nobody wants to breathe, but everyone has to.

Here, the AS-300RB can make breathing noticeably more comfortable if you’re sensitive.

Where it won’t save you:

• A dusty bedroom

• A mouldy bathroom

• A pet-heavy living room

• A home with high humidity

• Any space that actually needs a HEPA purifier

If your triggers are in your home, this isn’t the device that solves them. You need bedding covers, a dehumidifier, or a real purifier for that.

This is a supplement, not your main asthma-management tool.

Who This Device Works For

Best for commuters

If you’re breathing the recycled air of buses, trains, Ubers, tubes, this is who it’s made for.

Best for travellers

Airports and planes are basically allergen bingo cards.

Best for people with reactive airways

If smoke, perfume, cleaning chemicals or dust set you off, this adds a protective buffer.

Best for office workers

Especially if your office insists on “natural ventilation,” aka someone cracking a window and hoping for the best.

Not best for home allergy control

A wearable isn’t the fix for a dusty environment.

Pros and Cons

Should You Buy It?

If your asthma, allergies, or sensitivities flare outside your home, then yes, this wearable purifier is worth it. It’s lightweight, easy to use, surprisingly well-built, and genuinely helpful in spaces you can’t control.

But if your main triggers live inside your house, save your money and invest in an actual room purifier or allergen-proof bedding instead. That’s where you’ll see real improvement.

For the person who wants cleaner breathing on trains, buses, planes, offices, or unpredictable public spaces, the Air Supply AS-300RB by Allergy Best Buys is the kind of quiet little gadget that earns its price over time.