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OpenAeros @openaeros.bsky.social · 03/12/2025

Curious about the start-up and functionality of the OpenCPC? Check out our quickstart video! youtu.be/HMPLmfvVzAM

youtu.be

Quickstart Guide: How To Use Your OpenCPC

YouTube video by OpenAeros

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OpenAeros @openaeros.bsky.social · 10/11/2025

Reducing complexity ➡️ reduced cost ➡️ reduced price. Optical counters are the heart of high-performing CPCs. By using the latest in manufacturing technology and some ingenuity to simplify and modernize our optical counter, resulting in a 10x reduction in associated manufacturing costs.

A graphic features a flatlay comparison photo of machine component parts of various shapes and sizes on a cool grey woodgrain tabletop, a black line divides the graphic in half vertically: on the left, the title "Traditional" sits above the photo and the following specs are displated below the photo: "9 machined components, 4 lenses, 48 total components"; on the right, the title reads "openCPC" and below the specs read "1 machined component, 0 lenses, 17 components"

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OpenAeros @openaeros.bsky.social · 03/11/2025

Hope everyone enjoyed their Halloween weekend! Here at the OpenAeros offices, everyday is spooky season. 👹🎃💆‍♂️

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OpenAeros @openaeros.bsky.social · 29/10/2025

Interested in (a low-ish audio quality phone video of) the talk @masknerd.bsky.social gave this year at the @americanaerosol.bsky.social conference in Buffalo? Well you're in luck! Here's his presentation of low-cost instrumentation measuring UFPs in real-world urban and suburban settings.

youtu.be

OpenAeros AAAR 2025: Low-Cost Instrumentation for Ultrafine Monitoring in Urban Environments

YouTube video by OpenAeros

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OpenAeros @openaeros.bsky.social · 20/10/2025

Miss our first OpenRespirator Creative Cohort Live meeting? No worries, we've posted our discussion here! Get to know our cohorts, get read-in on their efforts and progress, and see some early designs. youtu.be/C0Q0ZH6e5AA

youtu.be

OpenRespirator Creative Cohort: Live Meeting 1

YouTube video by OpenAeros

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OpenAeros @openaeros.bsky.social · 17/10/2025

🦇🎃🧛 'Tis the season... to discuss some of our favorite all-time makes. In the spirit of his OpenRespirator build, Wyatt (one of our ORCC creatives 👻) fills us in on a set of Halloween teeth he absolutely Had To Have and how he taught himself to design and produce his own in middle school.

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OpenAeros @openaeros.bsky.social · 10/10/2025

Join us this afternoon at 3pm CST for our first OpenRespirator Creative Cohort Live Meeting! Get to know our cohorts, get read-in on their efforts and progress, and ask your questions. Tune in here: bit.ly/48jHI6J 😷 💙 ▶️

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OpenAeros @openaeros.bsky.social · 10/10/2025

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OpenAeros @openaeros.bsky.social · 08/10/2025

Jon Jon is an artist, animator, masker, and maker hailing from Toronto. Jon Jon has been executing his own PPE builds and mods for years, incorporating his hobbies and art with practical and health needs. Here, he talks about cosplay and masking and the exciting opportunities in their overlap:

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OpenAeros @openaeros.bsky.social · 06/10/2025

This year, we’ve been working with a team of passionate, creative makers to put our open source respirator prototype manufacturing methods to the test. We’re so excited to be introducing you to a couple of them this week. In the meantime, here’s some background on what we’ve been up to: (1/4)

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Aaron Collins @masknerd.bsky.social · 23/09/2025

Glad to bring the "little CPC that could" to the Healthy Indoor Air event at the UN today. The conversation in clean air are moving in the right directions. Open source hardware will be part of the solutions and proud to show off the OpenCPC as part of tools that can help us measure it.

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OpenAeros @openaeros.bsky.social · 23/09/2025

Aaron (and our little CPC! 🥹) are taking their places on the floor of the UN! This year is the inaugural General Assembly High Level Side Event on Indoor Air Quality and we're so excited to participate. The panel will open soon, watch along here: webtv.un.org/en/asset/k1v... #IndoorAir

OpenAeros founder Aaron Collins poses for a selfie from the floor on the UNGA High Level Side Event On Indoor Air Quality with the OpenCPC. The CPC is on, Collins is wearing a mask and suit, and the meeting room behind him is filling with people from across the globe who are convening to discuss IAQ policy.

the OpenCPC sits facing a filling room at the UN General Assembly Side Event on Indoor Air Quality. Its screen displays a live particulate count and the screens labelling participant and audience seats face back, reading #IndoorAir

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OpenAeros @openaeros.bsky.social · 19/09/2025

Come work with one of our sister projects!

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Aaron Collins @masknerd.bsky.social · 15/09/2025

I couldn't think of a better way to have spent the last 2.5 years of my life. I am incredibly proud of what the team at @openaeros.bsky.social was able to accomplish. There were many who said this was impossible, but we did the impossible and this is just the start. 😁 #cleanairisahumanright

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OpenAeros @openaeros.bsky.social · 12/09/2025

We believe that clean air researchers and proponents are doing critical work for our health and future. Too few have had access to the tools to investigate the next frontier of airborne pollutants: ultrafine particles. But we have big news... (1/4)

youtu.be

Introducing the OpenCPC!

YouTube video by OpenAeros

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OpenAeros @openaeros.bsky.social · 09/05/2025

So, why does clean air really *matter*? The hazards we breathe are largely invisible and - the way we usually read the data - the human cost of those hazards has been invisible too. Aaron makes the case than in 2022, poor air quality was the # 1 killer in America (1/) www.youtube.com/live/b45hakf...

Aaron Collins stands at a podium saying "we're going to talk about aerosol science". Behind him are four charts taken from the slides demonstrating the largest causes of American mortality in 2022.

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Aaron Collins @masknerd.bsky.social · 12/02/2025

Completely silly this happened you can't cancel science. We will continue to collect some cool data and share it anyways. Plus I feel like you only get a handful times to reference an Indigo Girls song in your title.

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OpenAeros @openaeros.bsky.social · 11/02/2025

In the time since we posted this, entire working groups dedicated to this and related community concerns have been eliminated from the EPA. If you were also slated to present air quality data or programming and would like to join us in presenting online, please reach out!

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Aaron Collins @masknerd.bsky.social · 07/02/2025

If you are interested in moving the needle on respirator design, now is your chance.

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OpenAeros @openaeros.bsky.social · 07/02/2025

In the wake of federal changeover, March's EPA air sensor conference has been cancelled. We were excited to present work on community ultrafine exposure to our peers and policy makers. In lieu, we plan to make the presentation to the public online. Abstract is below. You can’t cancel science.

Presentation abstract reads "Closer to (Ultra)Fine: Can a Low-Cost Open-Source Condensation Particle Counter Change the Sensor Landscape?
Presented by Aaron Collins, OpenAeros™
Awareness of the adverse health effects of PM2.5 aerosol exposure is growing, with increasing evidence highlighting the critical role of ultrafine particles (UFP) in harmful exposure. UFPs, including combustion-generated particles below 300 nm, are not detected by low-cost optical particle counters (PM2.5 sensors) due to their limited light scatter.
Similar to the revolution in hyperlocal PM2.5 measurement brought about by low-cost sensors like PurpleAir, the introduction of an open-source, low-cost condensation particle counter (OpenCPC™) offers new opportunities for hyperlocal UFP measurements. These measurements can enhance our understanding of UFP exposure and sources in outdoor spaces, and can address the high spatial concentration gradients associated with UFP measurements. Additionally, leveraging an open-source architecture enables a solution that can scale up to provide improved measurement coverage at deployment costs attainable by communities.
Outdoor UFP exposure was investigated using an OpenCPC counter co-located with a PurpleAir sensor at multiple locations, with data collected over long durations at multiple geographic locations. The total particle number count from PurpleAir sensors (particles >0.3µm) was compared with the OpenCPC’s measurements (particles 0.010 - 1µm). Correlations and trends in fine and ultrafine particle counts were explored, including diurnal trends and the impacts of temperature, humidity, and local fine and ultrafine particle sources."

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OpenAeros @openaeros.bsky.social · 04/02/2025

Calling all covid conscious makers, product designers, and 3D artists! OpenAeros is excited to announce our search for makers, designers, and advocates to participate in a first-of-its-kind effort to develop three entirely new, entirely open source respirator designs. (1/4)

A black, white, grey, and blue recruitment poster shows a hand with blue nail polish doodling a mask on a laptop screen and asks "Great idea to make a better mask? Join us." The text further reads "engineers, makers, designers, 3-D artists" and includes a link to apply included at the bottom of this thread.

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OpenAeros @openaeros.bsky.social · 04/02/2025

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OpenAeros @openaeros.bsky.social · 31/01/2025

At OpenAeros, we strive to meet people where they are with the tools they need. Our mission of accessibility, inclusivity, and decentralized, open source collaboration makes the choice to pivot to using this as our primary social network an easy one. (1/2)

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OpenAeros @openaeros.bsky.social · 22/01/2025

Guess what? That video with the absurdly mixed audio from Christmas Eve? It's updated, audible, and full of extremely timely holiday 2024 tidings. Spend a few minutes relaxing in 2024 nostalgia with us and hear about our open Source approach here at OA. 💙❄️🎅 youtu.be/y4B73273x-8

youtu.be

Why We're an Open Source Company: [AUDIO CORRECTED] December Update Part 2

YouTube video by OpenAeros

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OpenAeros @openaeros.bsky.social · 24/12/2024

Happy Holidays from the team at OA! This xmas eve, we're chatting open source ethos, our love for the community, and... christmas pudding? Come for the debrief stay for the blooper reel -- or last week's CPC update ❄️🌲🕯️ youtu.be/kXC-iiBMejU

youtu.be

Why We're an Open Source Company: December Update Part 2

YouTube video by OpenAeros

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OpenAeros @openaeros.bsky.social · 10/01/2024

It’s been a long road but we are so excited to share our progress on the world’s first open source, low-cost, condensation particle counter! What is it and why should you care? @masknerd.bsky.social explains why this CPC is a BFD. youtu.be/OxQSAvvOpw4

youtu.be

OpenCPC Update - January 2024

OpenCPC is the world's first open source condensation particle counter. At OpenAeros we believe that an open source model combined with innovative ideas ca...

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OpenAeros @openaeros.bsky.social · 06/12/2022

Welcome two new employees to OpenAeros! One is excited to help change the world, and the other is cleaning the air. I will let you pick who is who 😀 Also add another to the #Vflexgang

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OpenAeros @openaeros.bsky.social · 20/09/2022

We love to use technology to solve problems, and leverage the open source model to help other researchers in the future. x.com/masknerd/statu…

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