As part of the CleanAIR project, we are installing modern environmental sensors at 50 locations throughout Békéscsaba:

• The installation sites are selected in cooperation with researchers from the University of Szeged during the project, ensuring coverage of busy roads, densely populated residential areas, schools, kindergartens, playgrounds, and other critical urban points.

• The aim of this installation strategy is to provide a comprehensive picture of urban air quality during different times of day and under varying weather conditions.

This sensor network allows residents to access site-specific, real-time data.

The data collected by the sensors play a key role in understanding the urban atmosphere:

• PM2.5 (fine particulate matter) – one of the most dangerous air pollutants, easily penetrating deep into the lungs.
• PM10 (coarser particulate matter) – can also cause serious health problems.
• Temperature and humidity – to monitor changes in the urban microclimate.

At especially sensitive, high-risk locations, we also measure additional parameters:

• Nitrogen oxides (NO) – to identify pollution from traffic.
• Ozone (O₃) – a smog component formed as a result of sunlight.

We also strive to acquire black carbon sensors, which are able to distinguish between:

• Traffic-related exhaust emissions,
• Pollution from heating (wood, coal, or waste burning).

This data takes urban pollution mapping and targeted intervention planning to a new level.

CleanAIR does not just measure—it also makes information easily accessible to the public.

The free-to-download mobile app and web platform:

• Provide a real-time air quality map, showing current data for every monitoring site (PM2.5, PM10, temperature, humidity).
• Use color-coded visualizations to help users quickly assess air quality (e.g., green – clean air, red – heavily polluted).
• The map also displays forecasts from machine learning models, indicating which city districts are expected to experience improvement or deterioration in the coming hours.

The goal of the CleanAIR sensor network and application is to make the invisible threat—air pollution—visible and to provide everyone with a tangible tool for healthier urban living.