Professional-Grade & Affordable Air Quality Monitor

Both the AirGradient Open Air Max and the AirGradient dashboard are ready to scale. No matter how many monitors you need for your deployment, we have the infrastructure to support it. With our affordable pricing, the Open Air Max is also much more scalable, giving higher-resolution insights at a much lower price.

As the Open Air Max uses the same dashboard as other AirGradient monitors, the Open Air Max can also be combined with lower-cost Open Air monitors to create a dense network of air quality monitors. Match dense Open Air monitors with less dense Open Air Max monitors and reference stations to get the highest resolution air quality insights available at a fraction of the price.

Our monitor works right out of the box but can be further calibrated to improve accuracy, and anyone can easily perform these calibrations. You can align the sensor with a local reference instrument, use public reference data (via OpenAQ or station APIs), or rely on the US EPA’s formula or our in-house calibration parameters from co-locating each monitor with our own Palas Fidas 200 reference instrument.

Unlike competitors that charge a monthly fee for ongoing calibration services, we’ve built our calibration features into the platform and made them openly accessible to everyone. The process automatically extracts and applies calibration parameters, so you don’t need advanced skills or specialized equipment. Simply select which monitors to calibrate, and our tool handles the rest, making it easy to maintain accurate readings without extra costs.

AirGradient has an expert science team led by Dr Anika Krause, who is constantly working on improving the accuracy of all AirGradient monitors. Alongside our in-house science team, we also run over 20 colocations around the globe, with monitors located at many top research institutions.

Our algorithms are open-source and transparent, meaning that they are viewable and adjustable by everyone. Despite using the same components as many competitors, our monitors have some of the best accuracy in the class.

While most companies spend heavily on marketing their products, we believe in investing in research and development and letting our monitors speak for themselves.

More than 90% of people globally breathe polluted air, and the majority of these are in large cities. Reference-grade instruments are undoubtedly the most accurate air quality monitors, but these are pricey and out of reach for many communities.

Since air pollution is also very localised, this highlights the need for accurate, low-cost sensors that can create dense networks to provide data in high resolution. The AirGradient Open Air Max is ideally suited for this task, and features sensors for four of the five pollutants included in the WHO guideline for air pollution.

With solar power and cellular connectivity, the Open Air Max can be deployed almost anywhere and it is completely self-sufficient. This device isn’t limited by the length of a power cable or the range of a WiFi network, allowing unparalleled deployment options.

If you’re considering purchasing from us, we recommend reading our terms and conditions and privacy policy. What you might not already know is that many companies actually own your data - even if you think it’s yours.

We are different in that we believe you, the customer, should always own your data. As such, we give full ownership and control of your data, and we can’t take that away from you. Combined with the fact that our devices are open source and can’t be bricked, this means your data will always be yours.

The Open Air Max measures PM, CO₂, TVOCs, NO₂, O₃, Temperature and Humidity.

The PM sensor (Plantower PMS5003) measures particulate matter, especially smaller particles like PM_2.5, which have the potential to cause significant harm to our well-being. These tiny particles are released into the air through various sources such as vehicle emissions, industrial activities, burning of fossil fuels or wildfires. When inhaled, these small particles can penetrate deep into our respiratory system, leading to a range of health issues. Long-term exposure to PM_2.5 has been linked to respiratory and cardiovascular diseases, including asthma, bronchitis, heart attacks, and even premature death.

The Open Air Max includes two PMS5003 modules, allowing for redundancy and self-calibration. This self-calibration process allows the Open Air Max to continue providing accurate readings without long-term drift.

We have also included a Sensirion SHT40 temperature and humidity sensor. This sensor is isolated from other components to allow for more accurate measurements that better reflect the ambient conditions.

The CO₂ sensor (SenseAir S8) provides valuable insights into local emission sources. Elevated CO₂ levels detected by this sensor can serve as indirect indicators of other harmful gases frequently emitted alongside CO₂, such as sulfur dioxide (SO₂), and carbon monodioxide (CO). These gases may not always be apparent through particulate matter (PM) measurements, especially in scenarios where power plants or industrial facilities use advanced filtration systems. Another critical application of the sensor is monitoring for potential leaks from underground carbon storage facilities. While the sensor is not designed to measure subtle atmospheric CO₂ trends (e.g., the global increase of around 430 ppm), our internal testing demonstrates a strong correlation with reference-grade instruments.

Additionally, the Open Air Max is equipped with both NO₂ and O₃ sensors from AlphaSense. While many NO₂ sensors exhibit cross-sensitivity to ozone (O₃), the inclusion of separate, dedicated sensors ensures precise measurements for both pollutants. This dual-sensor approach enhances the monitor’s ability to meet regulatory requirements and align with air quality standards and guidelines, such as those outlined in the Clean Air Act.

The monitor also integrates the Sensirion SGP41 sensor for total volatile organic compounds (TVOCs) and NO_X. This sensor detects relative spikes in VOCs and nitrogen oxides using the Sensirion VOC Index. Although VOCs are commonly associated with indoor environments, they are also prevalent outdoors, originating from sources such as chemical plants, fuel stations, natural gas leaks, and waste burning. It is worth noting that VOC readings may be influenced by non-harmful substances like ethanol or sunscreen, meaning elevated values do not always indicate hazardous conditions.

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.