The Ozone Data Layer on the PurpleAir Map

In 2018, PurpleAir worked on a project alongside Citizens of Clean Air (CCA) to create what they call “tri-sensors” - sensors that measure particulate matter, volatile organic compounds, and ozone. This project took place in Grand Junction, Colorado, and around 12 sensors were created and set up to report their data to the PurpleAir map. To view the ozone readings, PurpleAir introduced the ozone data layer.

“Tri-sensors” use PurpleAir monitors to measure the particulate matter, BME680 sensors from Bosch, and ozone sensors from the New Zealand company Aeroqual, which were custom-designed to connect to PurpleAir devices.

We hope to cost-effectively incorporate new types of sensors, such as ozone sensors, in the future.

1 Like

HI Ethan,

Very good to note about tri-sensors and developments. What’s the timeline for its release? How can I get to test tri-sensor?

Thank you,

1 Like

Hi @Zuber_Farooqui, these sensors were only created for the project done by Citizens of Clean Air. We do hope to incorporate more sensors into PurpleAir devices in the future - like ozone - but we do not have any timeline for release.

1 Like

Good to know about this new development. Over here in Greece NO2, and subsequently Ozone in summer, have very high levels - well over the safety limits, and I personally would like to monitor those as well. Right now I am doing it with an Airly sensor, but I would prefer if there were the opportunity to monitor them within the PurpleAir platform. I hope to see this developed very soon! Thanks for the good work you do!

Awesome, sign me up, once you get that ready for sale. I think there’d be a good amount of demand for such a lower price, tri-sensor. More, different types of data = good (IMO), with Ozone and VOC being a good initial priorities.


I want an ozone sensor, too! I live in the fairly dense SF Bay Area, and we are prone to smog. There ought to be at least a couple of PurpleAir ozone sensors in this area, but there are none. Sign me up!