Open Source | Open Hardware | Open Data

Open and Accurate Air Quality Monitors

We design professional, accurate and long-lasting air quality monitors that are open-source and open-hardware so that you have full control on how you want to use the monitor.

We actively support partners with open air quality monitor standards and enable them to work towards a cleaner environment.

We’ve pledged 1% of sales to the preservation and restoration of the natural environment.

The AirGradient Air Quality Monitors

Affordable and open-hardware air quality monitors for indoor and outdoor use.

PRO Indoor Monitor

Available fully assembled and tested or as a kit that can be easily assembled within a few minutes

  • CO2 (Senseair S8 NDIR CO2 sensor)
  • PM1, PM2.5 and PM10 (Plantower PMS5003 PM sensor)
  • TVOC/NOx (Sensirion SGP41)
  • Temperature/Relative Humidity (Sensirion SHT3x/4x)
  • OLED display 1.3"
  • USB-C cable (2m, 90 degree)
  • Fully open-source code so you can easily make adjustments
  • 24 months AirGradient data platform (or connect it to your own server, e.g. home assistant)

from USD 138.00

More Information

Open Air Outdoor Monitor

Outdoor air quality monitor with dual PM modules. Measures PM1, PM2.5, PM10, Temperature and Humidity.

  • Weather and UV Proof Enclosure
  • Wall and Pole Mounting
  • PM1, PM2.5 and PM10 (Plantower PMS5003T PM sensor)
  • Dual PM Modules for enhanced accuracy and life-time
  • Temperature/Relative Humidity
  • USB-C cable (4m)
  • Fully open-source code so you can easily make adjustments
  • 24 months AirGradient data platform (or connect it to your own server, e.g. home assistant)

from USD 95.00

More Information

Keep in touch

Subscribe to our newsletter, and we keep you informed about new features of our open hardware monitors, innovative use cases of air quality monitoring and our mission to democratize air quality data.

The AirGradient Dashboard & Maps

Most AirGradient monitors are fully open-source, and you can send the data to any server, i.e. Home Assistant. In case you do not have your own data platform we include access to the AirGradient dashboard - a data platform specifically made for air quality monitoring. Outdoor monitors can also be displayed on the AirGradient Map.

Real-Time Dashboard

The powerful dashboard lets you immediately see the air quality and environmental status of multiple locations. Built for speed and scale.


You can set up specific alerts and are notified automatically if air quality is exceeds your defined ranges.

Historical Data

The air quality data is saved in 5 minute intervals and all data can be easily exported for further analysis.


Get powerful daily and weekly reports detailing the air quality of each location, providing you with a clear, concise summaries at a glance.

“It’s paradox that countries with the highest air pollution often can’t afford high density air quality monitoring. We work hard to provide open, accurate and affordable monitors so that people can protect themselves against harmful pollution.”

Achim Haug, Founder of AirGradient

What makes AirGradient Different

100% commitment to accurate and sustainable air quality monitoring.


We are working with leading universities to achieve high levels of accuracy and for our outdoor monitor are currently running co-location testing in four continents.

Long Lasting

All components have been selected for maximum lifetime. The monitors are easy to assemble, maintain and repair and we provide spare parts.

Supporting the Clean Air Movement

We actively support organizations that work towards a healthier air quality by providing open source monitor kits, workshops and donations.

Friendly Support

We are known for giving 100% to help our customers reach their goals. Get in touch with us. We love to hear from you and how we can support you in monitoring your air quality!

Open Designs

The monitors are licensed under CC license with complete documentation. Our community maintains integrations to popular platforms like Home Assistant.


We actively support organizations in all parts of the world with affordable monitoring hardware and donations. Contact us to discuss how we can support your organization.

Data Ownership

Unlike competitors, the data your monitor delivers belongs to you. Period. We support organizations with proper attribution for the networks they setup.

Designed for Sustainability

We design our products to have a low environmental footprint, use paper based packaging material and also request our suppliers to use environmentally-friendly packaging material.


We are very thankful for the overwhelming support we get for the AirGradient air quality monitors and are especially thankful for people that write about their experiences using the monitors. Below is a wide range of reviews from AirGradient users!


BBC Newsround featured our indoor monitor that is used in the SAMHE project, the largest study on classroom air in the world. A big part of this project is to increase the awareness of healthy air among primary and secondary students.

Jeff Geerling on Basic Kit

We are a huge fan of Jeff Geerling YouTube Videos, and he made a fantastic video review when we had only our first air quality kit, the Basic kit. It’s great that he also talks what actually made him want to know more about the air quality in his basement office.

Igor Bubelov on DIY Pro and Outdoor Monitor

Igor purchased and reviewed our indoor DIY kit and we liked his unbiased review on our indoor monitor so much that we gave him two outdoor monitors with the hope that he would also write about them. And it actually happened! Read his detailed review on the Open Air.

Nicholas Schmidt on DIY Pro and Outdoor Monitor

Many thanks also to Nicholas who reviewed our indoor and outdoor open hardware kits and wrote about his reasons to know about the air he breathes. By the way, in the meantime we made some changes on the outdoor enclosure and the assembly with the cable management is much easier now.

See The Air Blog on Basic Kit and Display

Sotirios not only wrote about our basic kit but also about our open sourced small information display that is particularly popular with student projects in schools.

Yosua Ian Sebastian on AirGradient Indoor Kit with Home Assistant via ESPHome

This is a great technical review how Yosua setup our open hardware indoor monitor with his own server based on home assistant.

Where is Your Review?

If you like our open hardware monitors please spread the news and consider writing a review about them! Since our monitor designs are open and under Creative Common license, and we want honest and unbiased reviews it is against our ethos to pay for reviews. But we would be very happy to support in other ways. Get in touch with us.

Our Story

AirGradient started as a volunteer project to help a school in Northern Thailand monitor the air quality in classrooms during the highly polluted “burning season”. From the start, we worked with students and educators to not only increase awareness in the area of air quality by building monitors but also in understanding the health impacts of air pollution, and the positive changes that can be made to reducing air pollution.

So from the beginning we put a strong focus on open designs, robust and long-lasting hardware and a strong desire to support people from all around the world with affordable and effective air quality solutions. We believe companies like ours need to act responsible and work towards a healthier and more sustainable environment. As a result joined the 1% for the Planet movement where we pledge to donate 1% of our sales to organisations protecting our planet.

In our industry we see trends that are against people's benefit e.g. locking customers into subscriptions, not allowing customers to own the air quality data they generate or high ongoing costs e.g. through expensive expansion modules. With our open hardware, open source and open data approach we strive to provide much higher ongoing value for our customers.

We actively work together with partners from all around the world that share our vision to make accurate air quality monitoring affordable and accessible. Feel free to get in touch with us at any time if you have any questions or your project to share!


We are fortunate to have such a strong community sharing our mission to bring open, accurate and affordable air quality monitoring to everyone running thousands of open-hardware monitors in more than 70 countries around the world.

Feedback From Our Community

AirGradient have consistently gone above and beyond their contractual duties in order to better support the SAMHE Project. They have shown great flexibility and a genuine interest to listen to the complex needs of the project; as a result, they deliver valuable products and a friendly service, both in a manner that is timely for the project.

Dr. Henry Burridge
Imperial College London

We built 20 DIY sensors to monitor the air quality and particularly CO2 in our nursery. The system works extremely well and the alerts from the AirGradient dashboard platform are very helpful.

Tim Davis

Achim from AirGradient was extremely helpful to sort out a small issue I had during the building of the sensor. I compared the data of the AirGradient DIY sensor with two other air quality monitors that cost much more and the data from the Airgradient seems to be very accurate.

Ethan Flick

The San Joaquin Valley of California has extreme climate injustice and the worst air quality in the United States, yet continues poorly monitored. The SEEN Team has partnered with AirGradient to facilitate low-cost monitoring in rural disadvantaged communities, and to increase awareness and education related to air quality. We intend to provide more and better real-time air quality information for local decision makers to act in the best interest of their underserved communities.

Angel S. Fernandez-Bou, PhD, Central California

Recently picked up an air quality sensor from AirGradient. Fun kit with out-of-the-box data viz. Can see where I had the window open in the morning which resulted in a significant increase in particulates in the air. AC system later filtered them out.


Having tested numerous air quality sensors for the projects we are doing I found myself extremely impressed with AirGradient. Not only are they technically first class with their product, they have a level of engagement and adaptability which makes working with them very easy. A welcome element to this is their clear commitment to the importance of environmental issues, showing itself in their interest in the details of our projects - all this helps them to deliver…!

Professor Rod Jones
University of Cambridge

I was part of the pilot. The build was very easy and the plastic enclosure of the Pro version very nice. I first connected it to Home Assistant on my Pi but then found the dedicated data platform from AirGradient a much better fit.

John Wagen

AirGradient has helped us to gain valuable insights into the air quality in each of our classrooms. AirGradient’s dedication to this mission has made it possible for any school or center to monitor their air quality in a cost effective way.

Kay Erikson
Director, Children's Pre-School Center, Palo Alto

Having used the AirGradient indoor DIY kits as well as the commercial AirGradient ONE in awareness projects with schools and universities here in Thailand, I am very keen on piloting this new outdoor monitor. I am also interested in exchanging ideas and resources for student engagement with this open source projct.

My son has asthma. And I am trying to pass on my love of DYI electronics to him. So I thought we’d build it together to help him track if conditions might be of concern to his health. I’m not sure if Luxembourg’s air is bad, but I wouldn’t call Central Europe exactly good. And with our own sensor we can also track traffic influences etc.


In 2019, 99% of the world’s population was living in places where the WHO air quality guidelines levels were not met.

World Health Organization

Contact Us

We love to hear from you and how we can support you in monitoring your air quality!

Get in Touch