Frequently asked questions

What does Klimerko measure?

Do Klimerko devices measure outdoor or indoor air quality?

Klimerko devices are designed to measure outdoor air quality.

What does each Klimerko device measure?

Klimerko devices assess the quality of outdoor air, measuring:

  • concentration of PM1, PM2.5 and PM10 particles in micrograms per cubic meter (μg/m³)
  • air humidity (%)
  • air temperature (°C)
  • air pressure (mbar)

Klimerko Pro devices additionally measure:

  • sulphur dioxide (SO₂)
  • nitrogen dioxide (NO₂)

Do Klimerko devices measure air quality in real time?

Yes, Klimerko devices show the current level of air pollution in the location where they are installed. The devices measure and display real-time information every 15 minutes.

What is the air pollution map?

What does the Klimerko map show?

On the map, you can view where and how many open source and open hardware Klimerko air quality measuring devices are currently installed on the territory of Southeast Europe - including Serbia, Bosnia and Herzegovina, Croatia, Montenegro and Macedonia.

Since this initiative relies on citizen participation, the number of devices will continue to grow as citizens assemble new devices. Consequently, the map will gradually include more locations across Southeast Europe and potentially beyond.

How do I read the map data?

The circles on the map default to display the current PM2.5 values of Klimerko devices. You can easily switch to view PM5, PM10, temperature, humidity, or air pressure readings instead.

The numbers in the circles show the average reading at that location. Clicking on these circles opens a left menu with more detailed data from the device readings.

When zoomed out, closely located devices are grouped, showing the mean value and color scale for those locations. Zooming into the map allows you to see the individual values of any grouped devices.

How can I find the results of a specific Klimerko measuring device on the map?

You have two options:

  1. Click on any circle on the map to view detailed information about the air pollution level measured by a specific device.
  2. Open the left pop-up menu by clicking the menu icon on the left of the map or on any circle. Then, click on the magnifying glass icon and search for a specific city or device name in the search bar

What is air pollution and why is it bad?

Why do we have air pollution?

Air pollution is primarily the result of human activities, such as industrial processes and transportation, which release harmful substances into the atmosphere. These pollutants include PM (particulate matter) particles, which can have detrimental effects on both the environment and human health.

How are PM particles formed?

Most PM (particulate matter) particles are a result of combustion processes, which occur when various materials burn and release exhaust gases. They often come from sources like power plants, factories, vehicles (especially diesel trucks), and even garbage burning.

What are PM1, PM2.5 and PM10 particles?

PM (particulate matter) refers to tiny particles that are suspended in the air. The numbers indicate their size, referring to diameter in micrometres. These particles are a significant component of air pollution and can come from various sources, including industrial processes, vehicle emissions, and natural phenomena like dust and wildfires.

PM1, PM2.5, and PM10 particles are of particular concern due to their ability to penetrate deep into the lungs when inhaled. They can pose health risks, potentially leading to various health problems. To put it into perspective, these particles are less than one-seventh the thickness of an average human hair.

How do PM1, PM2.5, and PM10 particles affect health and at what concentration?

PM particles with a diameter smaller than 10 micrometres can be harmful to health, as they can easily enter the lungs and adhere to the alveoli, which are crucial for oxygen and CO₂ exchange in the bloodstream. According to the World Health Organization's global air quality guidelines, when the concentration of PM2.5 particles in the air exceeds 50 μg/m³ as a 24-hour mean, it becomes a health risk.

How can I install Klimerko?

How easy is the Klimerko device to use?


  1. Place the assembled Klimerko device (about the size of a mug) in a suitable outdoor location, such as a balcony.
  2. Connect it to Wi-Fi and power.
  3. Activate the device to start measuring air quality.
  4. View the results via your user account.

Is Klimerko calibrated?

No, Klimerko doesn't require calibration. Our testing has shown that the PMS7003 sensors used in the device are sufficiently accurate for everyday measurement.

We verified this by installing four PMS7003 sensors on the vehicle of the Institute for Public Health "Dr. Milan Jovanović Batut" and comparing this data with their professional sensors. We also cross-referenced the readings from nearby Klimerko devices with the official values provided by the Environmental Protection Agency.

One challenge with the PMS7003 sensors, when compared to the professional sensors used by the Batut Institute, is that bursts of polluted air can occasionally impact the readings. This issue has been resolved in Klimerko Firmware 1.3.0. Now, the device takes 10 readings before sending the average result to the platform. Additionally, the PMS7003 sensors show minimal reading deviations from one another.

Where is the Klimerko device installed?

The Klimerko device should be installed outside, in a location where it is protected from external influences (eg. not exposed to rain and direct sunlight).

How do I deal with poor air quality?

How do I stay safe indoors?

When the air pollution level surpasses 50 micrograms per cubic meter, stay safe by closing windows and doors tightly to prevent polluted air from entering. Seal any gaps around windows and doors for airtight protection. Consider using an air purifier to clean the indoor air you breathe, ensuring it's safe.

How do I stay safe outdoors?

If you need to go outside when air quality is poor, especially when PM2.5 particles exceed 50 μg/m³, protect yourself by wearing an N95 or FFP2/3 mask. Both disposable or reusable masks can effectively filter tiny harmful particles and help you breathe cleaner air to protect your health.

Additionally, consider limiting outdoor activities, checking air quality forecasts, choosing less polluted routes, seeking indoor spaces with air filtration, keeping your vehicle well-maintained, and staying well-hydrated. These measures can help reduce exposure to harmful pollutants and protect your health.

How can I get involved with Klimerko?

Who created Klimerko?

Klimerko was first created by the winning team at Descon 2018, a hackathon in Belgrade, Serbia. It has been continually improved and maintained by the Internet Society of Serbia, Hacklab Belgrade and the Descon technical community.

How can I order a Klimerko device?

You can order a device directly through the Internet Society of Serbia. Email and let us know which option you'd prefer:

  1. An already assembled Klimerko device ready to use: For organisations or individuals who want to donate a Klimerko device to community members — or install it themselves — and help grow the network and its maintenance.
  2. A do-it-yourself kit: For tech enthusiasts who wish to make their own device. Order a DIY kit through us, which includes all necessary components for assembling, configuring, and activating your Klimerko device independently. Alternatively, you can source the parts yourself (see our Klimerko GitHub) and reach out for assembly assistance as needed.

lease note that to use Klimerko, you'll need to mount the device outdoors where it can connect to both WiFi and a power supply. Each device comes with a 5m long cable and a suitable power supply.

How can I donate to the Internet Society of Serbia?

Your support is invaluable in helping our volunteers provide free technical assistance to citizens, including device installation, troubleshooting, parts replacements, and web services.

By contributing to the development and expansion of our community network in Southeast Europe and the improvement of our devices, or by donating a device to someone in need, you become a valued friend of the Klimerko network and the Air to the People initiative. Your generosity plays a crucial role in enhancing air quality and protecting public health. We are truly thankful for your support!

Here are the options for making your donation:

Display of a Klimerko measurement device

Klimerko device

Klimerko is a low-cost sensor device that measures harmful outdoor air particles. It is also an open source initiative that combines devices and networks with one aim: to raise public awareness about the importance of air quality in the countries of Western Balkans.

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