AirGradient ONE Enclosure Top View

AirGradient DIY Pro

Indoor Air Quality Monitor

The AirGradient DIY is an indoor air quality monitor kit enabling you to know if the air quality is healthy or not. It measures CO2, PM2.5, TVOCs, NOx, Temperature and Humidity. It’s easy to assemble, fully open-source and customizable, so you can extend it in whatever way you like.

Build Instructions Get It From Us
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Why Indoor Air Quality Matters

We spend 80% of our time indoors and often the indoor air is polluted not only from sources outside your home but also from indoor pollutants like off-gasing furniture, cooking and chemicals from cleaning. Additionally houses with insufficient fresh air ventilation can have very high CO2 levels that can cause headaches, tiredness and has a large impact on cognitive performance.

Measuring these air quality parameters can help you identify these pollutants and step by step creating a healthy and comfortable indoor environment.

Key Characteristics

AirGradient ONE Features

AirGradient uses high quality sensor modules from industry leaders like SenseAir, Sensirion and Plantower and every sensor goes through a multi-step testing and calibration process to ensure the highest accuracy.

The SenseAir S8 CO2 sensor utilizes NDIR technology for very accurate measurements. It auto calibrates with an automatic baseline calibration (ABC) every 7 days. High levels of CO2 can indicate insufficient ventilation and cause headaches, tiredness and lower cognitive performance.

For PM2.5 measurements, the AirGradient uses the Plantower PMS5003 sensor with laser scattering technology that has been extensively tested in various studies. Elevated levels of fine particles -especially below 2.5 microns - has been linked to a broad range of health issues including premature mortality, heart or lung problems, acute and chronic bronchitis, asthma attacks, and respiratory symptoms. The sensor module is factory calibrated.

TVOC and NOx is measured with the Sensirion SGP41 TVOC/NOx sensor. TVOCs are organic chemicals that can easily vaporize and enter the air we breathe. These often do have indoor causes like off gasing furniture or aggressive cleaning liquids. NOx are harmful gases that can be caused by indoor gas stoves or boilers.

Temperature and Humidity are measured with the Sensirion SHT3x/4x sensors which are one of the most accurate ones in the market. These two air quality parameters can give you good information about indoor comfort levels and also indicate e.g. the risk of mold due to high humidity levels.

The monitor has a built-in OLED display to show the current air quality and can also be connected to 2.4 GHz WiFi networks to communicate with data platforms.

We work very closely with a number of leading universities on air quality monitoring and our monitor has been selected for the largest study of classroom air quality in the world due to its performance and affordability. You can read more about our work with research institutions on our research page.

Flexible Data Platforms

AirGradient Dashboard with Data Shown

The AirGradient Open Air monitor is unique as it gives you full flexibility on how you want to monitor and use the data. Being open-source you are not locked in to any specific data platform but can connect the data to any server, i.e. Home Assistant or use the AirGradient data platform - a data platform specifically made for air quality monitoring.

This gives you complete ownership and freedom of your data and our community has built a number of extensions to existing data platforms, e.g. home assistant with ESPHome.

Of course you can also use the AirGradient dashboard that is already pre-flashed on the monitor and very easy to setup.

This 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 exceeds your defined ranges.

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

Outdoor monitors can also be displayed on the AirGradient Map and you can opt-in to share your outdoor data with openAQ, a non-profit with the mission to deomocritize air quality data and make it freely available.

Mounting Options

AirGradient PRO Mounting Instructions

The monitor can be mounted on walls or put on a desk with the optional clip-on stands. For wall mounting, the screw distances are compatible with common European or US junction boxes. The USB C cable is connected at the back of the monitor and the cables can either come in from the top or the bottom of the enclosure.

Easy to Assemble, Setup & Install

The kit is very easy to assemble. We provide detailed instructions and videos on how to connect the monitor to your WiFi network and set it up on the dashboard and map. If you run into any problem, just contact us directly and we are happy to help. You can also ask questions in the AirGradient Forum and get valuable tips from the community.

Optimized Enclosure

AirGradient PRO Enclosure Features

The enclosure has been designed with two primary goals, firstly to ensure accurate measurements of the air quality and secondly to be robust and long lasting.

For accurate measurements it is important that there is a good airflow to the sensor modules, that air loops in front of the sensor modules are avoided and that the risk of condensation inside the enclosure is as much as possible reduced.

The enclosure itself is very robust and consists of high quality ASA plastic that gives an excellent durability as well as UV protection.

Available as Kit or Fully Assembled

You can either buy the components yourself and build it on your own, or purchase as a kits or fully assembled unit with warranty and test report from our online shop.

AirGradient PRO (Kit)

AirGradient PRO Kit

Indoor air quality monitor measuring CO2, PM1, PM2.5, PM10, TVOC, NOX, Temperature and Humidity. Comes with pre-assembled PCB and can be built without soldering within minutes.

  • Sensors for CO2, PM, TVOCs, NOx, Temperature and Humidity
  • 2m USB C cable (w/o power plug)
  • Easy to assemble kit
  • 24 months AirGradient data platform with map (or connect it to your own server, e.g. home assistant)
  • Fully open-source code so you can easily make adjustments

USD 138.00

Build Instructions Get It From Us

AirGradient PRO (Fully Assembled)

AirGradient PRO Fully Assembled

Indoor air quality monitor measuring CO2, PM1, PM2.5, PM10, TVOC, NOX, Temperature and Humidity. Fully assembled and tested ready to be used immediately.

  • Sensors for CO2, PM, TVOCs, NOx, Temperature and Humidity
  • 2m USB C cable (w/o power plug)
  • Fully assembled
  • 24 months AirGradient data platform with map (or connect it to your own server, e.g. home assistant)
  • Fully open-source code so you can easily make adjustments
  • Tested in our test chamber with test report
  • Certified: CE, FCC, RoHS, REACH
  • 12 months warranty

Available September 2023

Technical Data

Below is the technical data of the default version of the AirGradient Pro as it is available in our online store.

ESP8266 D1 Mini v4
2.4GHz WiFi
Broken out on PCB: I2C, 2 GPIOs
Status LED, Push Button, USB C Connector
CO2 Sensor Module
SenseAir S8 (NDIR). 0 to 10000ppm. Accuracy: ±40 ppm ±3% of reading at 5 to 30°C, 0-85% RH (400 - 2000ppm range)
Particle Sensor Module
Plantower PMS5003 (laser scattering principle). Accuracy: ±10%@100~500μ g/m³, ±10μg/m³@0~100μ g/m³
Temperature and Humidity Module
Sensirion SHT3x/4x. Accuracy: Temperature ±0.2°C @ -40 to + 125°C; Humidity ±2% RH @ 0 - 100% RH
TVOC/NOx Module
Sensirion SGP41. Accuracy: TVOC <±15 @ 0 to 500 VOC Index; NOx <±50 @ 0 - 500 NOx Index
ASA Plastic, UV Resistant and Weather Proof
2m USB C Cable including data lines for flashing

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.

Ideally combined with an Outdoor Monitor

In order to fully understand the air quality of your environment, we recommend you also monitor the air quality outdoors.

By monitoring both, indoor and outdoor air quality you get valuable additional data, e.g. where the pollution is coming from and how well the ventilation and air purification of your home works etc. The AirGradient dashboard is well suited to compare indoor and outdoor air quality in combined reports and charts.

Go to our outdoor air quality monitor page to learn more about our open-source outdoor monitor.

In 2019, 99% of the world population was living in places where the WHO air quality guidelines levels were not met. Ambient (outdoor air pollution) in both cities and rural areas was estimated to cause 4.2 million premature deaths worldwide in 2016.

World Health Organisation

Open Hardware - Easy to Extend

AirGradient PCB Features

The open-hardware / open-source nature of the monitor allow easy changes and additions on the firmware as well hardware. The board is powered by an ESP8266 D1 mini microcontroller that is easy to program with a wide eco-system and has integrated WiFi capabilities.

The D1 can directly be flashed through the USB C port and thus changes in the open-source firmware can easily be done.

For the ones, who would like to make adjustments to the monitor, there are breakout pins available for I2C and additional IOs. The board provides both, 5 and 3.3 volts.


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.

Open Hardware, Open Source, Open Data

We at AirGradient have a strong desire democratizing air quality monitoring. Access to the information about the air you breathe should not be a privilege of the rich. Air pollution is one of the largest global environmental and health risks, requiring a high density sensor network to understand and solve the problem. We provide a blueprint of a robust, affordable and open design that citizens and NGOs worldwide can use to accurately measure air quality.

Fully Open Source

All code, schematics, 3D files etc. are open-source and published under CC-BY-SA 4.0 license. You can easily adapt the hardware as well as flash your own firmware.

You own your Data

There is a trend in our industry to monetize air quality data to the extent that often the owner of the monitor does not own the data. We believe this is wrong. The data that your monitor generates should belong to the owner of the monitor.


We have partnered up with openAQ, a non-profit with the mission to provide air quality data to influence policy, and to enable the public to access information on air pollution through open data and open-source tools.

1% for the Planet

We joined 1% For The Planet and pledged to donate at least one percent of your annual sales to non-profit organisations dedicated to protect the planet. You can read more about our motivation to join 1% for the planet on our plog post ‘Why We Joined 1% For The Planet’

AirGradient provides 2000 Air Quality Monitors to UK Schools

AirGradient has been selected to provide air quality monitors for the biggest study of air quality in schools anywhere in the world (the SAMHE Project). The objective is to understand classroom air in UK schools post-covid, building an unparalleled data set of air quality in classrooms across the country and improve long-term air quality for all schools.


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.

World Map with Customer Locations

Statements from our Community

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.

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

I’m very happy to contribute to this open hardware project with my product design experience and working with the team to not only ensuring a beautiful look but a highly functional design. Turning the required air flow characteristics and vent specification into a good looking product was a challenge I really liked. I’m looking forward to see the product in many Citizen Science projects around the world.

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

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.

Henry Burridge
Imperial College London

Why we care about Air Quality

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 beginning, we have worked with students and educators to building hardware to increase awareness in the area of air quality, to understand the health impacts of pollutants, and to empower the positive changes that can be made to reduce air pollution.

The experience and expertise that we gained designing and manufacturing our professional AirGradient ONE RESET Air Accredited Monitor has been put into our open-source / open-hardware air quality build instructions and kits.

The industry-grade sensor modules used in our open hardware monitors are the same modules found in pre-built monitors costing hundreds of dollars. As a result, you get highly accurate data quality, essential to having a reliable understanding of the air around you.

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