Every uRADMonitor device now has a service record: a live page showing its full lifecycle and a cell service counter. Better oversight, higher data quality, better network uptime.
Every uRADMonitor device now has a service record: a live page showing its full lifecycle and a cell service counter. Better oversight, higher data quality, better network uptime.
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 […]
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 […]
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 […]
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 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 […]
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 […]
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 […]
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.
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.
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.
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 […]
Developed to meet the growing demand for accurate, localised data, the MODEL A4 is as a modular, durable, and easy-to-maintain device, launched in late 2023 to improve reliability and simplify field servicing in diverse outdoor conditions. Its multi-parameter sensing capabilities, combined with the weatherproof enclosure and the versatile modular design that simplifies field installation and […]
uRADMonitor is one of the biggest global sensor networks for environmental monitoring, providing real-time data on air quality, radiation, and other parameters. While most of the units in the network are made by us and typically come with a predefined unique Device ID, assigned at manufacture time, the network allows open hardware and custom sensors to […]
I am a researcher working on topics related to aerosol composition and dynamics, in particular the measurement and analysis of PM2.5 and PM10 in urban environments. In my work I have been using data from uRADMonitor devices to obtain a better understanding of air quality in Romanian cities. Low-cost sensors vs. reference grade equipment Low-cost […]
Advances in optical particulate matter sensors have opened the door for the existence of air quality monitoring networks using low cost sensors. The reduced cost allowed the spread of thousands of IOT automatic sensors, offering an unprecedented spatial resolution, the so called “hyperlocal air quality monitoring”. While signifiant technical advances have been made to offer […]
This is a guest post written by a long time user of the excellent uRADMonitor devices that has recently retrofitted his house with the awesome Home Assistant brains. This article assumes you have a basic knowledge of Home Assistant and how to use it’s config file config.yaml. uRADMonitor Radon is a newly launched product, that […]
This Guide is written for MacOS users, however, there is a dedicated Firmware Update Guide for other platforms. What do we need?1. Smoggie hardware. (Smoggie-PM, Smoggie-CO2, and Smoggie-Gas)2. The provided USB cable (or any usb cable that also has data transfer capability).3. The new firmware. For this contact support (send the model and the serial number printed on the device or […]
The model A3 is a multi-sensor air quality monitor that tracks environmental parameters relevant both to outdoor and indoor use. For example temperature + pressure + humidity + CO2 + Formaldehyde + VOCs are important when discussing air quality in our homes, while temperature + pressure + humidity + ozone + Particulate Matter PM1/PM2.5/PM10 + […]
From day one, uRADMonitor aimed to give people open, comparable and uniform environmental data across large areas. Some time with this project and it became evident that spreading the network uniformly across the world is going to be a challenge. This was mainly due to economic differences of the various countries in the world. Simply […]
The “CITY” is our professional range Air Quality Monitor, released in 2020. It is equipped with the best: 1PPB resolution sensors for 4 gases built in (Ozone, Nitrogen Dioxide, Sulphur Dioxide and Carbon Monoxide), plenty of connectivity options for data upload including Ethernet, WIFI, GSM/GPRS, LoRaWAN (EU868, US915, IL915, AU915, AS923, IN865, etc), NB-IOT, LTE-M […]
The PMSA003 is one of the smallest laser scattering particulate matter sensors available on the market today. The manufacturer, Plantower, has built a reputation with their robust sensors widely used in applications worldwide. Various labs tested their performance against reference stations and came to positive conclusions in regards to the accuracy of these sensors. Some […]
The uRADMonitor network reached 1k units worldwide back in September 2018 during the ASIC conference in Oakland US. It was becoming clear that Air Quality monitoring is a major concern with various implementations happening thanks to recent advancements in sensors and IOT technologies. Our portfolio of products already covered multiple scenarios both in terms of […]
Radu Motisan has a dream to give the world a view on what is happening in your surrounding environment and how this could influence your health. In my own professional life, I’m involved as a consultant in IOT data gathering and processing and I design and deploy solutions for organizations with whom I share that mutual interest: […]
While a relatively new design, the uRADMonitor A3 accounts for a quarter of the total uRADMonitor network already. Introduced in 2016, it was supported by Orange in several SmartCity implementations. With an impressive number of sensors, the A3 produces highly relevant data to describe air quality in the place where it is installed. There are […]
VOC sensors are nothing new to this project, we’ve used them intensively in the uRADMonitor hardware units. Back in 2015, the Bosch BME680 was integrated into the uRADMonitor model D, followed by the model A3 using the same excellent sensor. Now the uRADMonitor AIR, our first wearable, relies on the BME680 again for a low […]
Our uRADMonitor INDUSTRIAL was selected for a Pilot smartcity implementation in Kranj, Slovenia, to complement with Air Quality Monitoring the smart lighting solution implemented by EcoSunLights. Five units with LoRaWAN connectivity where deployed, each in a protective rainproof enclosure with side air vents and a top metallic sun shield: The enclosure holds the uRADMonitor INDUSTRIAL […]
uRADMonitor INDUSTRIAL is the fifth uRADMonitor hardware product designed in 2017 for IOT Air Quality Monitoring with applications in smart homes, smart cities and industry. It is a general purpose, high performance Air Quality detector for Particulate Matter (PM2.5 and PM10), Carbon Monoxide (CO), Ozone (O3), Sulphur Dioxide (SO2) and Nitrogen Dioxide (NO2). The sensor […]
This tutorial shows how you can compile and flash the KIT1 firmware on Windows (at least Windows 2000) without going through all the hassle of installing and using Cygwin and Eclipse. As an additional problem, there are several incompatible “make” implementations for Windows, so I decided to avoid “make” too. The AVR8 GNU toolchain does […]
The uRADMonitor model A, the KIT1 and the model A3 with Ethernet have all taken advantage of various scripts and tools developed by the community which allowed direct data access over their LAN connection. You can see a few of these below: uRADMonitor weather station integration Local stats graph with uRADMonitor RRD Tool graphing Include […]
Technically this is still a KIT1, and runs KIT1 firmware, but it becomes very similar to a model A unit, as it does everything a model A does. LZ1JER built one for his new weather station based on a Raspberry Pi, which is an impressive construction already: As you can see, this KIT1 variant is […]
Open Source means collaborative work, joined effort leading to extraordinary things. Recently we saw how a talented maker from Oradea, Romania pushed his KIT1 #uradmonitor unit to the limit! He used a lot of his personal time to build and document something better than the original. In the end he asked for nothing except to […]
Last week I’ve assembled a KIT1 and posted some details about it to the forum. radhoo praised the article and asked me to share it on this blog, maybe will be helpful for the readers. So, here is an updated “copy-paste” from the original post. The diy kit is based on the v1.1.104 pcb. It […]
