Atmospheric new particle formation (NPF) is a naturally occurring phenomenon, during which high concentrations of sub-10 nm particles are created through gas to particle conversion. The NPF is observed in multiple environments around the world. Although it has observable influence onto annual total and ultrafine particle number concentrations (PNC and UFP, respectively), only limited epidemiological studies have investigated whether these particles are associated with adverse health effects. One plausible reason for this limitation may be related to the absence of NPF identifiers available in UFP and PNC data sets. Until recently, the regional NPF events were usually identified manually from particle number size distribution contour plots. Identification of NPF across multi-annual and multiple station data sets remained a tedious task. In this work, we introduce a regional NPF identifier, created using an automated, machine learning based algorithm. The regional NPF event tag was created for 65 measurement sites globally, covering the period from 1996 to 2023. The discussed data set can be used in future studies related to regional NPF.

Andalusian Institute for Earth System Research University of Granada Granada Spain

ANDRA DISTEC EES Observatoire Pérenne de l'Environnement Bure France

Center for Physical Sciences and Technology Vilnius Lithuania

Centre for Cardiovascular Research Partner Site Munich Heart Alliance Munich Germany

Climate and Atmosphere Research Center The Cyprus Institute Nicosia Cyprus

Department of Aerosol Chemistry and Physics Institute of Chemical Process Fundamentals CAS Prague Czech Republic

Department of Atmospheric Sciences University of Utah Salt Lake City USA

Department of Environment CIEMAT Madrid Spain

Department of Environmental Sciences Faculty of Meteorology Environment and Arid Land Agriculture King Abdulaziz University Jeddah Saudi Arabia

Department of Epidemiology Institute for Medical Information Processing Biometry and Epidemiology Ludwig Maximilians University Munich Munich Germany

Department of Physics University of Malta Msida Malta

Division of Physics Division of Combustion Physics Lund University Lund Sweden

El Arenosillo Atmospheric Sounding Station Atmospheric Research and Instrumentation Branch INTA Mazagón Huelva Spain

Environmental Chemical Processes Laboratory Department of Chemistry University of Crete Heraklion Greece

Environmental Radioactivity and Aerosol Tech for Atmospheric and Climate Impacts INRaSTES National Centre of Scientific Research Demokritos Paraskevi Greece

Environmental Science Center University of Augsburg Augsburg Germany

European Commission Joint Research Centre Ispra Italy

Experimental Aerosol and Cloud Microphysics Leibniz Institute for Tropospheric Research Leipzig Germany

Forecast Research Division National Institute of Meterological Sciences Seogwipo Korea

German Environment Agency Berlin Germany

Institut Scientifique de Service Public Liege Belgium

Institute for Atmospheric and Earth System Research Faculty of Science University of Helsinki Helsinki Finland

Institute for Environmental Research and Sustainable Development National Observatory of Athens 1 Metaxa and Vas Pavlou Palea Penteli Greece

Institute for Medical Research and Occupational Health Zagreb Croatia

Institute for Nuclear Research and Nuclear Energy Bulgarian Academy of Sciences Sofia Bulgaria

Institute of Atmospheric Sciences and Climate ISAC Bologna Italy

Institute of Atmospheric Sciences and Climate Lecce Italy

Institute of Environmental Assessment and Water Research Barcelona Spain

Institute of Epidemiology Helmholtz Zentrum München German Research Center for Environmental Health Neuherberg Germany

Izaña Atmospheric Research Centre Agencia Estatal de Meteorología Santa Cruz de Tenerife Spain Group of Atmosphere Aerosols and Climate AAC IPNA CSIC Tenerife Spain

Laboratoire de Physique de Clermont Auvergne UMR6533 CNRS UCA Aubière France

Laboratory of Atmospheric Chemistry Paul Scherrer Institute Villigen PSI Switzerland

MRC Centre for Environment and Health Environmental Research Group Imperial College London London United Kingdom

National Centre for Atmospheric Science School of Geography Earth and Environmental Sciences University of Birmingham Edgbaston United Kingdom

NIHR HPRU in Environmental Exposures and Health Imperial College London London United Kingdom

School of Natural Sciences Ryan Institute's Centre for Climate and Air Pollution Studies University of Galway Galway Ireland

SIOS Knowledge Centre Svalbard science centre Longyearbyen Longyearbyen Norway

The Lisbon Council Brussels Belgium

The Netherlands Institute of Applied Scientific Research Utrecht Netherlands

Univ Grenoble CNRS IRD IGE Grenoble France

Univ Lille CNRS UMR 8518 Laboratoire d'Optique Atmosphérique Lille France

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Atmospheric new particle formation identifier using longitudinal global particle number size distribution data