MODEL INDUSTRIAL carries four electrochemical cells chosen at order time (typically O3, NO2, SO2, CO), each with a ~2 year service life.
MODEL INDUSTRIAL carries four electrochemical cells chosen at order time (typically O3, NO2, SO2, CO), each with a ~2 year service life.
Smog is visible air pollution from particles and reactive gases. Learn the two types of smog, what causes it, its health effects, and how to track smog near you in real time.
What to measure, which instruments to use and how to read the results. A practical guide to measuring air pollution indoors and outdoors, from reference stations to low-cost sensors.
The formaldehyde and ozone electrochemical cells in MODEL A3 have a ~2 year
service life. Here is how to tell when they are due and how to replace them.
Radon is the second leading cause of lung cancer. Learn the types of radon detector, how continuous radon monitoring works, where to place it and how to read the results.
A Geiger counter detects ionising radiation and reports it in CPM or µSv/h. Learn how GM tubes work, what the readings mean, and how to choose a monitor.
uRADMonitor now has a Cities entry in the top menu. It turns the live sensor network into a set of clean, per-city air-quality pages: pick a country, pick a city, and see what the air is doing there right now and over the last 30 days, all from public data the network already collects. Where […]
An air quality sensor measures the pollutants you actually breathe. Learn how they work, what to measure, and how to pick one that gives trustworthy data.
At Școala Gimnazială Dumbrăvița, Timiș County, two uRADMonitor MODEL A3 stations have been running since December 2025 in the “Casa Albă” building on Creației street. One is in the entrance hall and serves as a reference for the building. The other is in the classroom of the 3rd grade, class F. Every three minutes, each […]
When the uRADMonitor CITY was designed, the goal wasn’t just to build a good air quality station. It was to build a platform: one that could evolve as monitoring needs change, without requiring a complete hardware redesign every time a new sensor category becomes relevant. That design philosophy is now being put to the test […]
Presenting the uRADMonitor API Helper program If you want to connect a custom sensor to the uRADMonitor network, you need to register a new device and obtain a Device ID before you can start uploading data. To help others, I’ve created a little program that allows you to easily register your own custom sensor to […]
Introduction The goal of this project was to bring data from two different measuring devices I use into the uRADMonitor network: a GQ RadonPro for measuring radon concentration and ionizing radiation, and an AirGradient Open Air O-1PST for monitoring outdoor air quality. Both devices are connected to Home Assistant, which made it a natural bridge […]
I have been testing an independent ESPHome-based bridge that connects a RadiationD-v1.1 (CAJOE) Geiger counter board to both Home Assistant and uRADMonitor. One ESP8266, two integrations The pulse output is connected to D1 / GPIO5 on the ESP8266. ESPHome counts the pulses locally, exposes the measurements and diagnostics to Home Assistant through its native API, […]
The TechMP Webinar, July 15, 2026 uRADMonitor founder Radu Motișan was invited as a speaker in a live webinar organised by the University of Craiova, hosted by lect.univ. Ph.D. Mihaela Tinca Udriștioiu. The session brought together over 50 participants from Romania, Bulgaria, Greece, and North Macedonia, covering everything from the physics of ionising radiation to […]
September 8–9, 2026, Craiova: For the third time, following the events in 2022 and 2023, the University of Craiova becomes the venue for a hands-on air quality sensor workshop, this time as part of the Interreg ROBG PROMISE-Hard project (000299). uRADMonitor founder Radu Motișan returned to the Physics Department for a two-day extended workshop, guiding […]
Hi everyone, This is a write-up of my open-data station: an SBM-20 in a GGreg20_V3 front end, an Olimex ESP32-POE-ISO-EA-IND doing the counting, and Home Assistant doing the uploading. Device ID 13000200, currently in Estonia. The headline is that I did not write any firmware. The whole thing runs on stock ESPHome — about thirty […]
Hi all, Back in 2021 I started off with a very simple Heltec wifi kit 32 and since then I’ve been happily logging data using DIDAP (old method EXP1) protocol with a very basic interface and switched over to an Espressif ESP32 wrover-e with a little more advanced version thanks to it’s hardware specs and […]
Tuning My Piano (ala John Barth’s “Floating Opera”) I live in the USA’s Pacific Northwest. Until the last several years I never felt I needed a smoke particulate sensor. But a couple years ago, I experienced some chest pain and coughing after a wildfire smoke event that sent me to the hospital emergency room with […]
A uRADMonitor MODEL CITY leaves the rooftop behind, mounts on a sailboat’s pushpit, and starts feeding air quality data into the OceanoVox ocean-observation network. For over a decade, the uRADMonitor network has grown one fixed station at a time , mounted on rooftops and walls across 76 countries. Now this one moves. Off the Atlantic […]
The uRADMonitor MODEL A3 is a plug-and-play, automated air quality monitoring station designed for continuous, unattended operation. Using 8 high-quality sensors, it simultaneously tracks 11 environmental parameters: particulate matter (PM1, PM2.5, PM10), ozone, formaldehyde, carbon dioxide, volatile organic compounds (VOC), temperature, barometric pressure, humidity, and noise level. It is lab-tested for accuracy , validated by […]
The Project Students at the Emil Racoviță Theoretical High School in Vaslui set out to do something most schools wouldn’t attempt: design and build a smart solar bench from scratch. They built it, wired it, and equipped it with electronics and the result is a functional piece of outdoor furniture that doubles as an environmental […]
The MODEL A3 (hardware version 10 and above) is designed so the three sensors that age can be replaced at home, with no soldering. The process takes about 15 minutes. What wears out and why Three sensors have a designed lifespan of approximately two years: Everything else: CO2 (optical principle), temperature, humidity and pressure (MEMS […]
Compromise: 21 July 2026, 07:56:34–07:56:42 UTC Wider campaign against this host: 18–21 July 2026 Affected system: cerespir.ro (WordPress front-end) Impact on uRADMonitor sensor network, API and measurement data: none Status: contained, cleaned, patched What cerespir.ro is, and what it is not cerespir.ro (“Ce respir” what I breathe) is our Romanian-language public platform for air quality […]
For years, the uRADMonitor network has been quietly doing what no single sensor can: covering the planet with a continuous, real-time picture of radiation, air quality and toxic gas concentrations. What it lacked was a way to tell you, the user behind the screen, immediately, when something you care about crossed a line you drew […]
Starting this month, uRADMonitor automatically notifies sensor owners when their devices need attention. The system covers two situations: sensors that have gone offline, and sensors with aging electrochemical cells that are due for maintenance. Aging warning applies to the uRADMonitor CITY, INDUSTRIAL, SMOGGIE-GAS, SENSIGAS, MODEL A3 and MODEL A4. Why this matters The value of […]
We said this already, but here at uRADMonitor, everything we learn in the field, every piece of user feedback, and every R&D result feeds into new products or upgrades: implementing better sensors, new connectivity options, and improvements that increase lifespan, robustness and accuracy. This is the direct result of our commitment to building the world’s […]
What if students could measure the air quality of their own school yard, compare it with data from a school in Portugal, and contribute that data to a global environmental monitoring network, all as part of their classroom curriculum? That is exactly what the EcoRoots Erasmus+ project is doing, and Școala Gimnazială Slobozia Mândra from […]
A radiation monitor measures ionising radiation in real time, in CPM or µSv/h. Learn how radiation monitors work, the types, and how real-time networked monitoring works.
Recently my uRADMonitor A3 WiFi unit stopped connecting to the network. The device would power up but was unable to establish a WiFi connection. The symptom, 3 beeps and no hotspot. My initial suspicion was that the ESP-04 WiFi module had failed, so I began searching for replacement modules and placed an order for new […]
What to measure, indoor or outdoor, which connectivity, how accurate. Seven questions that help you choose the right air quality monitor for a home, a school or a city.
We are excited to announce that uRADMonitor CITY now supports SDI-12, the industry-standard serial digital interface widely used in environmental monitoring and data acquisition. With this update, uRADMonitor CITY can be connected directly to dataloggers, PLCs, weather stations, and other SDI-12 compatible equipment, opening the door to deployments in scientific, industrial, and municipal monitoring networks […]
Troubleshooting a KIT1 inverter that stayed near 90% duty cycle After publishing the Visual Studio Code build notes for the uRADMonitor KIT1 firmware, I continued testing an inverter duty-cycle issue on my KIT1 unit. My unit was able to reach the target Geiger tube voltage of 380V, but the inverter duty cycle was higher than […]
Today we are releasing the new Frontend v7 , the most capable version of the uRADMonitor map interface to date. Following the previous results implemented in the last version, the new Frontend 07 is built on OpenLayers 10, runs entirely in the browser with no plugins, and works on desktop and mobile alike. If you […]
This article documents the steps I used to compile the uRADMonitor KIT1 firmware from the Github code/124 directory using Visual Studio Code on Windows. The original uRADMonitor KIT1 firmware project was created for the AVR toolchain and appears to have been maintained using an Eclipse AVR-style project structure. That original setup is still valid, and […]
CO2 shows how well a classroom is ventilated. See the common limits, what real school data looks like, and how to measure and improve the air pupils breathe.
Almost 100 advanced uRADMonitor® #AirQuality sensors (A3, Model CITY + the new METEO for #Weather ) are being deployed in Bistrița 🇷🇴 via the EU 🇪🇺 B-CONNECT project! Several Universities are part of the consortium for data analysis & #Research 🌬️📡 In 2021, the city of Bistrița took a pioneering step toward environmental sustainability by […]
Radon is the leading cause of lung cancer after smoking. Learn the WHO and EU reference levels, why one short test is not enough, and how to lower radon at home.
Normal outdoor background radiation is about 0.05 to 0.20 µSv/h. Learn what changes it, how it compares to medical doses, and see live levels in your country.
Fireworks are launched by a small rocket that explodes in the sky, creating brilliant colors from burning metallic salts (e.g., strontium for red, barium for green, copper for blue) along with loud bangs and clouds of smoke. The explosion releases soot, chemical residues, heavy metals, burned paper, and large amounts of fine particulate matter (PM2.5 […]
As we wrap up 2025 with this end-of-year article, we’re thrilled to celebrate a year of impressive hardware advancements at uRADMonitor, pushing sensor precision and network reach to new heights. Above all, peace has been the greatest gift, creating the ideal conditions for creativity and progress to thrive, and 2025 delivered that, at least for […]
The uRADMonitor MODEL A3 is among the most capable multi-parameter air quality sensors currently available. Housed in a compact rugged enclosure, it integrates eight independent, high-quality digital sensors that monitor eleven air parameters: temperature, barometric pressure, relative humidity, volatile organic compounds (VOCs), formaldehyde, ozone, particulate matter (PM1, PM2.5, PM10), carbon dioxide, and noise level. Measurements […]
Magnasci SRL, the Romanian 🇷🇴 company behind the global uRADMonitor sensor network, has recently marked its ten-year milestone. Over this decade, the company has shown steady and visible progress: rapid product development, integration of advanced IoT and satellite technologies to remain competitive in a dynamic market, and continuous international expansion. Today, more than 4,000 uRADMonitor […]
PM2.5 is the air pollutant with the largest health impact in Europe. Learn the WHO and EU limits, the European Air Quality Index, and check live PM2.5 in your city.
The PM2.5 field test Inter-comparison Campaign previously announced in July, has now been launched in Vietnam’s capital Ho Chi Minh City, led by Institut Polytechnique de Grenoble and the CARE (Center of Asian Research on watEr) laboratory. The initiative is a collaboration between the Faculty of Environment – VNUHCM University of Science and the IGE laboratory (Institut des Géosciences de l’Environnement, Grenoble, France), […]
Just weeks after the massive late-August fire, another major blaze erupted on Tuesday evening, September 23, at a warehouse in Bucharest’s Sector 2, sending a huge cloud of smoke over the city. Firefighters have been working through the night and into Wednesday, with operations expected to continue for the entire day. Authorities issued multiple Ro-Alert […]
The uRADMonitor® KIT1 is an open-source IoT sensor, designed to be highly configurable and easy to hack. By default, it comes with a Geiger tube and an Ethernet module, making it perfect for autonomous radiation monitoring. You can order a pre-assembled unit here. Launched in 2016 during our first IndieGogo crowdfunding campaign, KIT1 has inspired makers worldwide. The full […]
On the morning of August 27, 2025, Bucharest woke up under a toxic cloud. A massive fire at the Dragonul Roșu commercial complex in Pantelimon sent thick smoke drifting across the city, with acrid air reported as far as Berceni and downtown Unirii. Official monitoring stations recorded pollution levels up to ten times above normal, with fine […]
uRADMonitor donates refurbished 🌱 air quality monitors for education and civic use At uRADMonitor, we believe technology should serve people and communities. Besides driving innovation in IoT and sensor technologies, another key directive we follow is to increase environmental awareness and responsibility. As part of our regular maintenance cycle, some uRADMonitor sensors were returned. While a […]
Indoor air is often 2-5x more polluted than outdoors. Learn the main indoor air pollution sources, health effects, and how to measure and reduce them.
Soon after joining URBREATH , an European initiative aimed at improving urban air quality through advanced monitoring and data-driven action , Cluj-Napoca integrated several dozen uRADMonitor® sensors across the city. The project brings together research institutions, technology providers, and local authorities to build networks of environmental sensors, collect real-time pollution data, and involve communities in […]