PTB, the Physikalisch-Technische Bundesanstalt is the national institute for science and technology and the highest technical authority of the Federal Republic of Germany in the field of metrology and certain areas of safety engineering. One of PTB's fundamental tasks is to realise and maintain the legal units in accordance with the International System of Units (SI) and to disseminate them, in particular within the framework of legal and industrial metrology. PTB has been involved as coordinator or work package leader in a significant number of EMPIR and EMRP projects dealing with traceable particle measurements, aerosol measurements and the development and evaluation of machine learning networks. PTB will coordinate the project, lead WP5 and will be active in all other work packages, except WP1, with a focus on deployment and training of machine learning algorithms via transfer learning in WP2.

DFM, the Danish National Institute of Metrology, develops and maintains the national measurement standards for aerosols. DFM has developed primary standards for the calibration of optical particle counters as well as generators for producing well-defined polystyrene-based aerosols in the laboratory. DFM will partake in WP1 on the calibration of bioaerosol monitors, by providing laboratory facilities for traceable particle counting. Having previous relevant experience in interlaboratory collaboration and comparisons, DFM will also participate in comparisons to further provide grounding for the validity of the developed method. In addition, DFM will be a participant in WP4 and WP5.

FMI, the Finnish Meteorological Institute, is a designated governmental agency providing information on the atmospheric physical state, chemical and aerosol composition, air quality, and related phenomena. FMI is responsible for both monitoring and modelling related atmospheric parameters. FMI is a Designated Institute based on the agreement between FMI and the National Metrology Institute of Finland VTT MIKES Metrology. FMI coordinates the EU Horizon Europe project SYLVA and leads one of the WGs of EUMETNET AutoPollen. Having this experience, FMI will lead WP3 (standardisation of the data I/O formats and guidelines for the data storage) and will contribute to WP1, WP2, WP4 and WP5.

LNE is well-experienced in particle physico-chemical characterisation, in aerosol generation/sampling and in particulate measurement techniques. Moreover, LNE is a member of the French Central Laboratory for monitoring air quality (LCSQA) which ensures the technical coordination of the monitoring networks in ambient air; the objective of LCSQA is to improve the quality of data needed to fulfil the requirements of European Directives, and to apply metrology tools. LNE coordinates the European Metrology Network on Pollution Monitoring (EMN PolMo), and particles in air, is one of the topics covered by this EMN. LNE will contribute to WP2, WP4 and WP5.

RISE is the Swedish NMI, working under the Swedish Ministry of Finance. RISE work with a broad spectrum of areas, one of which is air quality. RISE works on atmospheric emissions from combustion as well as indoor air. Within the area of aerosol there is also a well-established collaboration with Lund University, hosting the profile area “AEROSOLS”, where the area bioaerosols is included (airborne viruses). RISE will primarily be involved in WP2 on the characterisation of the artificially aged pollen particles, but also in WP1. RISE will also participate in WP4 and WP5.

Oberon was created in March 2021 by two researchers from CEA and CNRS and designs, produces and operates scientific instruments. Among them, Aerōtape is a mid-cost IoT aerosol analyser based on particle imaging and is dedicated to pollen monitoring. Other instruments focused on environmental monitoring are also developed at Oberon. Oberon will provide two Aerōtape instruments to be used in WP1 and WP2. Oberon will actively participate in WP1 during the calibration measurement campaign. Moreover, Oberon will take part in WP2 on the ML algorithm training and assessment. Oberon will also participate in WP3, WP4 and WP5.

Sciensano hosts the Belgian Coordinated Collection of Micro-organisms (BCCM/IHEM) fungal collection dedicated to human and animal health. This participant has a long-standing expertise in mycology and has developed protocols for the cultivation of sporulating fungi and the harvesting of dry spores that are able to be aerosolised in single particles. During the planned workshops (WP2), Sciensano will provide the reference biological material needed to generate labelled datasets of fungal bioaerosols. As member of the European Culture Collections’ Organisation, Sciensano will also be able to get access to other reference fungal collections. In WP3, Sciensano will facilitate contact with stakeholders by hosting the community consultation meeting in Brussels, Belgium. Sciensano will also participate in WP4 and WP5.

TUM‑MED, Technical University Munich, Germany, and its Institute ZAUM, Center of Allergy & Environment, has three decades of experience in pollen monitoring and was the first to implement a network of automatic pollen monitors in the world that was able to discriminate allergic from non-allergic pollen using artificial intelligence. TUM‑MED also hosted the first international campaign to compare all available automatic pollen monitors for a complete pollen season. TUM‑MED is able to host the raw data from all types of automatic pollen monitors from the EU Horizon Europe project SYLVA at the Leibniz Supercomputing Center. TUM‑MED has experience with individual pollen dosing systems that can be used in the field calibration process for automatic monitors. TUM‑MED was coordinator of the EU-project HIALINE (pollen allergenicity) and was, and is, WP leader in the EUMETNET AutoPollen and EU Horizon Europe project SYLVA. TUM‑MED will participate in all WPs.

EDI, the federal department of home affairs will participate through the Federal Office of Meteorology and Climatology Meteoswiss which operates the national bioaerosol monitoring network and runs the COSMO‑ART numerical model to provide 1 km-scale forecasts. Switzerland is the first country worldwide to have established a real-time monitoring network and is a leader in the field. EDI also coordinates the EUMETNET AutoPollen Programme, representing one of the key stakeholder communities of this project. EDI will lead WP4, which will be focused on creating impact. EDI will also participate in all other WPs. EDI is an associated partner associated to all internal beneficiaries.

METAS, the Swiss Federal Institute of Metrology, develops and maintains the national measurement standards for aerosols. METAS has developed primary standards for the calibration of optical particle counters and generators for producing well-defined aerosols in the laboratory. METAS will lead WP1 on the calibration of bioaerosol monitors and participate actively in WP2 on ML training, hosting a calibration workshop at its premises. Having long experience in ISO and CEN working groups, METAS will also contribute to the development of a new CEN standard. METAS will also participate in all other WPs. METAS is an associated partner associated to all internal beneficiaries.

NPL, the UK’s National Metrology Institute, develops and maintains the primary aerosol particle number concentration standard for the UK. NPL has experience of deploying ML methods in a metrology context, with a focus on trustworthiness and has developed a range of approaches for uncertainty evaluation for ML outputs. NPL will lead WP2 on the assessment of data processing and machine learning for field deployment. NPL participates in many relevant CEN and ISO committees in the aerosol community and will use this experience in standardisation to contribute to the development of a new CEN standard. NPL will also participate in all other WPs, except for WP1. NPL is an associated partner associated to all internal beneficiaries.

Swisens revolutionises environmental and process monitoring through new measurement methods and the automatic identification of aerosol particles in real time. With their innovative solutions, they advance the active contribution to global health and scientific knowledge. Swisens can contribute the needs of its international customers who are also stakeholders. Some of them are already operating or building bioaerosol monitoring networks. Thanks to its extensive experience in aerosol atomisation (Swisens Atomizer), bioaerosol measurement (Poleno measuring instruments), classification software and big data management, Swisens can and will contribute to all WPs. Swisens is currently involved in two Horizon projects with the context of bioaerosol monitoring: EU Horizon Europe projects SYLVA and AGRARSENSE. Swisens is an associated partner associated to all internal beneficiaries.