CitiObs – Enhancing Citizen Observatories for healthy, sustainable, resilient and inclusive cities

Project Information

CitiObs

Grant agreement ID: 101086421

DOI

10.3030/101086421

EC signature date 8 November 2022

Start date 1 January 2023

End date 31 December 2026

Funded under

• Food, Bioeconomy Natural Resources, Agriculture and Environment

Total cost

€ 5 272 950,00

EU contribution

€ 4 991 205,00

Coordinated by

STIFTELSEN NILU
Norway

Periodic Reporting for period 2 - CitiObs (CitiObs – Enhancing Citizen Observatories for healthy, sustainable, resilient and inclusive cities)

Reporting period: 2024-05-01 to 2025-12-31

Summary of the context and overall objectives of the project

CitiObs brings together tools and practice-based knowledge to support the co-creation of data, knowledge, and local action through Citizen Observatories (COs). Working in close collaboration with existing observatories, CitiObs supports the creation, strengthening, and scaling of inclusive and diverse COs, fostering an active role for citizens in observing and protecting the urban environment. The project focuses in particular on air quality and related environmental challenges, leveraging low-cost sensor technologies and wearables to enable meaningful citizen participation.

The overall objective of CitiObs is to expand and scale the deployment and uptake of Citizen Observatories as an integral component of inclusive, multi-stakeholder governance. By generating validated, policy-relevant citizen-generated data, contributing to GEO and GEOSS initiatives, and supporting the co-design of local actions, CitiObs advances solutions to urban challenges related to pollution and climate change in line with the European Green Deal.

To embed Citizen Observatories within multi-level transition governance and enable societal transformation towards sustainability and zero pollution, CitiObs follows three complementary pathways:

Pathway 1 – Data: transforming how citizen-generated data are produced, validated, accessed, combined, and used in research and policy, strengthening their credibility and uptake alongside official data sources.

Pathway 2 – People: broadening who participates in Citizen Observatories and how they engage, extending COs beyond environmental monitoring to include citizen-led local actions that actively protect and improve the urban environment.

Pathway 3 – Systems: strengthening interactions within and across Citizen Observatories and governance levels, while creating synergies with aligned initiatives such as the New European Bauhaus, which shares common values around sustainability, inclusion, and transformation.

Through large-scale real-world demonstration, CitiObs is enhancing a total of 85 Citizen Observatories. This demonstration is supported by tailored learning and collaboration mechanisms—including mentoring, peer learning, twinning, roadshows, Communities of Practice, and networking. Together, these mechanisms enable effective knowledge transfer while progressively shifting ownership and agency from the CitiObs consortium to local actors, supporting the long-term sustainability and impact of Citizen Observatories beyond the project.

Work performed from the beginning of the project to the end of the period covered by the report and main results achieved so far

CitiObs has established and demonstrated an integrated set of social, technical, and governance approaches to strengthen Citizen Observatories as inclusive, credible, and policy-relevant contributors to healthier and more resilient cities. A key achievement is the development, testing, and mentoring of a comprehensive suite of openly available CitiObs toolkits covering inclusive engagement, participation dynamics, citizen-led action, environmental monitoring, data validation, interoperability, and decision-ready information.

These approaches were co-designed and validated with five Frontrunner Cities and scaled through the onboarding of 30 Alliance Cases using a structured, light-touch model based on self-assessment, clustering, and peer learning, resulting in an active network of 35 Citizen Observatories, with expansion to Fellow Cities underway.

CitiObs also delivered a robust, open technical infrastructure for citizen-generated environmental data, validating 38,924 PM2.5 sensors across 43 countries and 927 cities using the FILTER framework, and distributing more than 300 sensors to participating cases. This enables citizen data to complement official monitoring systems for research and policy use.

In parallel, the project strengthened the science–policy interface through policy briefs, high-level roundtables, and engagement at European and international levels, and launched the CitiObs Knowledge Platform and Cookbook to ensure open access, reuse, and long-term sustainability.

Progress beyond the state of the art and expected potential impact (including the socio-economic impact and the wider societal implications of the project so far)

CitiObs advances beyond the state of the art by enabling citizen-generated environmental data to be validated, integrated, and used at scale. The project developed robust, open workflows to transform citizen observations into analysis-ready and decision-ready information, validating data from nearly 39,000 low-cost PM2.5 sensors across 43 countries and 927 cities without relying on routine co-location with reference instruments. This represents a significant advance over previous citizen science efforts that were limited to small-scale pilots or local calibration campaigns.

CitiObs further advances the field through interoperable, standards-based architectures based on the OGC SensorThings API and its STAplus extensions, integrating data quality annotation, privacy by design, and real-time data exchange. By combining these technical innovations with social science toolkits addressing inclusion and participation dynamics, and with New European Bauhaus–aligned citizen-led actions developed in collaboration with artists and creatives, CitiObs demonstrates that scalable and trusted citizen observatories depend on integrated socio-technical approaches rather than technical accuracy alone.