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The Citizens’ Observatories of Air

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

The CITI-SENSE Citizens’ Observatories Central Web Portal is designed to enable citizens to access not only 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 out what our COT can do for you and what you can do with our COT.

Find all the information you need in our COT on our Product brochure and Publications.

Air Pollution Perception Surveys

What do you think about air quality in the city you live, work or study? We would like to hear from you! You can help us understand how city dwellers perceive air quality issues in the city by either completing a short, anonymous online survey or using our CityAir app to share how you perceive the quality of the air 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.

To see the results from the CityAir App Campaigns in Cities, click here

Outdoor Air Quality in Cities

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

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

More information about citizens’ observatories of outdoor air quality 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 learn efficiently. This is a major issue across different parts of Europe and can reduce the quality of learning in schools.

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

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

More information about citizens’ observatories of indoor air quality 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.

More information about citizens’ observatories of environmental quality in four public spaces.

Your Voice and Your Observations

You can report on how you perceive your environment. Your subjective perceptions, e.g., if it is too polluted, too hot, too noisy or if you can’t breath properly, are important! And we would like 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 uploading your observations and leaving 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. 

You can use CITI-SENSE CityAir App to perceive the outdoor air quality in your surroundings.

Further, you join our Air Quality Surveys about outdoor air quality in cities, indoor air quality in schools, and environmental quality in public spaces. 

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 on 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 create a more comprehensive understanding of the world we live in.

Access to GEOSS Portal

Social Media

We have developed various social media platforms to facilitate 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.



Twitter citizensobs@twitter YouTube

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