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The Citizens' Observatories of Air

With the appearance of new low-cost sensor technologies, monitoring air pollution is in the hands of everyone. These novel sensor technologies open the opportunity to monitor air quality at spatial resolutions not possible to reach with traditional monitoring systems. Low-cost sensors are small, portable and easy to use. Citizens like you can now contribute to monitor the environment. In the next years, low-cost sensors will transform the way we describe and understand air pollution.

The CITI-SENSE Citizens' Observatories Central Web Portal is designed to enable citizens to not only have Access to real-time environmental information provided by a wealth of Sensor and sensor platforms, including Portable sensors and Static sensors, Mobile Apps and different types of Air pollution perception surveys, but also to provide a Forum for discussion, debate and sharing of your own personal observations. Your contributions are important and the Citizens' Observatories Toolbox (COT) is yours! Here you can find what our COT can do for you and what you can do with our COT.

Find all data you need in our Citizens' Observatories Toolbox!

Be a citizen scientist and contribute to Citizens' Observatories!

Outdoor Air Quality in Cities

Measurement data from fixed stations as well as micro sensors (mobile, hand carried, bike-mounted) which are deployed as part of the CITI-SENSE Project, are being used to assess air pollution in eight cities in Europe. 

This data will provide people with information about air quality and the health impact that air pollution can have on vulnerable groups. This information can be vital to your health.

View and download outdoor air quality data in eight cities!

Indoor Air Quality in Schools

Poor indoor air quality can have a major impact on both the students and the teachers' ability to concentrate and work efficiently. This is a major issue across different parts of Europe and can reduce the quality of learning in Schools.

To help schools to learn more about, and participate in improving air quality, we have equipped 12 schools in Europe with electronic sensor units that measure different aspects of indoor air.

The sensor units measure temperature, relative humidity, CO2, VOC (volatile organic compounds), NO2, Particles (PM10, PM2.5, PM1), ozone, CO, noise and radon. The data is updated frequently, and can be viewed and accessed through this portal. 

View and download indoor air quality data in 12 schools!

Environmental Quality in Public Spaces

Citizens' Observatories in Vitoria, Spain, have been developed to monitor environmental quality in public spaces within the city! 

Participants are selected to measure environmental variables and provide their subjective perception of environmental quality and comfort of the public spaces.

Find out more about this exciting innovation, and if you can take part!

View and download environmental quality data in four public spaces!

Your Voice and Your Observations

You can report on how you perceive your environment. Your subjective perceptions, e.g., is it too hot, too noisy, you can not breath properly, are important! And we want to know. We are all affected by our environments, so if you have other physical/emotional symptoms, e.g., are you happy, sad, irritated, etc., feel free to let us know.


In addition to upload your observations and leave your comments, you can also discuss any issue related to air quality in your surroundings, and participate in other ongoing discussions. We have a common forum where all participants can discuss with each other. 

Let your voice be heard and your observation be seen!

Collaboration and Synergy with GEOSS

Data from the CITI-SENSE project will be made available in the GEOSS portal. This is the main entry point to Earth Observation data from all over the world. Our data will seamlessly merge with data from other providers to help created a more comprehensive understanding of the world we live in.


Access to GEOSS

Social Media

We have developed various social media platforms to foster communication between the project partners, stakeholders and users, and to facilitate citizens’ engagement, participation and network building. These include a Citizens’ Observatories Facebook Page, Twitter Account, LinkedIn Group, YouTube, and city-based Facebook pages.





Hai-Ying Liu, Mike Kobernus, David Broday, Alena Bartonova. (2014). A conceptual approach to a citizens' observatory - supporting community-based environmental governance. Environmental Health. 13:107. 10.1186/1476-069X-13-107.

Lahoz W. (2013). CITIZENS' OBSERVATORY - Where does our air quality come from? Meteorological International. August 2013:126-128.

Milena Jovašević-Stojanović, Alena Bartonova, Dušan Topalović, Ivan Lazović, Boris Pokrić, Zoran Ristovski. (2015). On the use of small and cheaper sensors and devices for indicative citizen-based monitoring of respirable particulate matter. Environmental Pollution. 206: 696–704. 

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This project has received funding from the European Union's Seventh Framework Programme for research, technological development and demonstration under grant agreement no 308524.