The Atovio Pebble Removed Over 99.9% of PM2.5. Three Tests Said the Same Thing

TL;DR

• IIT Kanpur tested the Atovio Pebble wearable air purifier for PM1, PM2.5, and PM10 removal using an Optical Particle Sizer in a controlled 5.75 cubic foot chamber.

• Three independent trials, using incense to generate a stable particulate load across the 1 to 10 micrometre range.

• Total particle concentration (PM1 to PM10): average reduction over 99.99% across all three trials.

• PM1 removal: average reduction over 99.999% (IIT Kanpur Large Particles Report).

• PM2.5 removal: consistently over 99.9% across all three trials.

• All three runs produced reproducible, consistent results.

• Pollen particles also fall within the 1 to 10 micrometre range tested.

Why This Question Matters for a Wearable Device

A wearable air purifier sits close to your face, operating continuously in your personal breathing zone. The question of whether it can actually remove PM2.5 and finer particles is not just technical. It is a health question. If the device is near your lungs but is not removing the particles that cause harm, wearing it does not protect you.

The National Aerosol Facility at IIT Kanpur evaluated the Atovio Pebble for its ability to reduce airborne concentrations of PM1, PM2.5, and PM10 under controlled conditions across three independent trials. Not one test. Three. And the results were consistent across all of them.

Why PM1, PM2.5, and PM10 Are Not the Same Thing

PM10, particles up to 10 micrometres in diameter, enter the upper airways and lungs, aggravating respiratory conditions and causing inflammation. PM2.5, at 2.5 micrometres and smaller, reach the alveolar region deep in the lungs, impairing gas exchange and contributing to cardiovascular stress.

PM1, particles smaller than one micrometre, penetrate the deepest of all. Long-term exposure has been linked to serious cardiovascular and respiratory disease because of how far into lung tissue these particles travel.

Pollen grains also fall within the 1 to 10 micrometre size range. So performance across this range is directly relevant not just for pollution protection but also for allergy sufferers who react to seasonal airborne triggers.

How the Test Was Conducted

Testing was carried out in a controlled chamber with an internal volume of 5.75 cubic feet using an Optical Particle Sizer (OPS), which measures airborne particle concentrations by diameter and count per cubic centimetre.

Incense was used to introduce a stable particulate load across the 1 to 10 micrometre range, simulating dust, combustion particles, and pollen-sized material typical of Indian urban environments. The Atovio Pebble was then activated and concentrations recorded at fixed intervals. Three independent trials were performed. A weighted average based on particle size distribution was applied to ensure larger particles contributed proportionally more to the calculated mass.

What the Three Trials Actually Showed

Total Particle Concentration (1 to 10 micrometres)

Trial 1: initial 390,643 particles per cubic centimetre, final 8, reduction 99.995%. Trial 2: initial 398,361, final 15, reduction 99.994%. Trial 3: initial 442,219, final 15, reduction 99.995%. Average: over 99.99% (IIT Kanpur Large Particles Report).

PM1 Removal

PM1 concentrations exceeded one million particles per cubic centimetre at the start of each trial. Trial 1: 1,074,203 to 15. Trial 2: 1,262,899 to 13. Trial 3: 1,587,991 to 7. Average reduction across all three: over 99.999%.

The IIT Kanpur report describes this as virtually complete removal, noting PM1 particles are the most dangerous because they penetrate the deepest into lung tissue.

PM2.5 Removal

Initial PM2.5 concentrations ranged from 21,822 to 163,259 particles per cubic centimetre across the three trials. Final concentrations: 16, 15, and 16 respectively. Reductions: 99.925%, 99.975%, and 99.990%, with an average above 99.9% across all three trials.

What This Means for Pollen and Allergy Protection

Because pollen grains fall within the 1 to 10 micrometre size range, the near-complete particle removal observed in these tests also applies to pollen-sized allergens. The IIT Kanpur report notes that in Indian conditions, where road dust, biomass burning, traffic emissions, and high seasonal pollen loads combine to create constant particulate exposure, this level of efficiency is particularly relevant for protecting respiratory health.

Why Three Consistent Trials Matter

One strong result can be a good day. Three independent trials with consistent results indicate reliable, repeatable performance. The IIT Kanpur report confirms results were reproducible across all three runs. How this particle removal performance connects to real-world breathing zone protection, tested in a room with the door fully open, is covered here.

The Bottom Line

Three trials. Average PM1 reduction over 99.999%. Average PM2.5 reduction over 99.9%. Average total particle reduction over 99.99%. Consistent and reproducible across all three runs. From IIT Kanpur's National Aerosol Facility, independently conducted, covering pollution particles and pollen-sized allergens across the full 1 to 10 micrometre range. That is what the Atovio Pebble wearable air purifier was tested against across all three independent trials. For the ozone safety testing results confirming the Pebble introduces no harmful by-products, that is covered in a separate blog.