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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!

Air Pollution Perception Surveys

What do you think about the air quality in the city you live, work or study? We would like to get your opinion! You can help us understand how city dwellers perceive air quality issues in the city by either completing a short, anonymous on-line survey or using our CityAir app to share how you perceive the air quality in your surroundings. It should only take 5-10 minutes. The results will be made public on this web site as well. 


If you want to participate to our air quality perception questionnaire, click HERE

If you want to use our CityAir app, click HERE.

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. 

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 Platforms







We have developed various social media platforms to foster communication between the project’s 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 page. These social media platforms are all about engagement, participation, relationship building and dissemination. Every platform encourages its users to take part, by commenting on what they see and getting involved in conversations with others.

For more information, Contact Us!