Sediment was collected on the quays along the Seine River across Paris City following the flood of March 2024. The objective was to measure a panel of potential contaminants in sediment deposited by the Seine River before the Paris 2024 Olympics. Fallout radionuclide (137Cs, 7Be, 210Pb) activities were analysed by gamma spectrometry using hyperpure germanium detectors at the Laboratoire des Sciences du Climat et de l’Environnement (LSCE, Paris-Saclay, France). Major, minor and trace elemental concentrations were analysed at the same laboratory with an Inductively Coupled Plasma – Mass Spectrometer equipped with 3 quadrupoles (TQ-ICP-MS, Thermo ScientificTM iCAPTM).  Stable radiogenic lead isotope (206Pb, 207Pb, 208Pb) ratios were also determined (Briard et al., 2023). Particle size distribution was analysed with a laser diffraction particle size analyser (Mastersizer 3000 with Hydro LV, Malvern Panalytical) and Total Organic Carbon (TOC) was quantified using a Rock-Eval 6 equipment. Pharmaceutical products and pesticides were analysed following the protocol described by Thiebault et al. (2021), and lifestyle products following the methodology described by Bernier-Turpin et al. (2025).This dataset is described and interpreted in a manuscript submitted for publication in an international journal.ReferencesBernier-Turpin, G., Moilleron, R., Cenik, C., Alliot, F., Guerin-Rechdaoui, S., Thiebault, T., 2025. Do suspended particles matter for wastewater-based epidemiology? Water Research, 280: 123543.Briard, J., Ayrault, S., Roy-Barman, M., Bordier, L., L'Heritier, M., Azema, A., Syvilay, D. and Baron, S., 2023. Determining the geochemical fingerprint of the lead fallout from the Notre-Dame de Paris fire: Lessons for a better discrimination of chemical signatures. Science of Total Environment, 864: 160676. Thiebault, T., Alliot, F., Berthe, T., Blanchoud, H., Petit, F., Guigon, E., 2021. Record of trace organic contaminants in a river sediment core: From historical wastewater management to historical use. Science of Total Environment, 773: 145694.

Sediment was collected on the quays along the Seine River across Paris City following the flood of March 2024. The objective was to measure a panel of potential contaminants in sediment deposited by the Seine River before the Paris 2024 Olympics. Fallout radionuclide (137Cs, 7Be, 210Pb) activities were analysed by gamma spectrometry using hyperpure germanium detectors at the Laboratoire des Sciences du Climat et de l’Environnement (LSCE, Paris-Saclay, France). Major, minor and trace elemental concentrations were analysed at the same laboratory with an Inductively Coupled Plasma – Mass Spectrometer equipped with 3 quadrupoles (TQ-ICP-MS, Thermo ScientificTM iCAPTM).  Stable radiogenic lead isotope (206Pb, 207Pb, 208Pb) ratios were also determined (Briard et al., 2023). Particle size distribution was analysed with a laser diffraction particle size analyser (Mastersizer 3000 with Hydro LV, Malvern Panalytical) and Total Organic Carbon (TOC) was quantified using a Rock-Eval 6 equipment. Pharmaceutical products and pesticides were analysed following the protocol described by Thiebault et al. (2021), and lifestyle products following the methodology described by Bernier-Turpin et al. (2025).This dataset is described and interpreted in a manuscript submitted for publication in an international journal.ReferencesBernier-Turpin, G., Moilleron, R., Cenik, C., Alliot, F., Guerin-Rechdaoui, S., Thiebault, T., 2025. Do suspended particles matter for wastewater-based epidemiology? Water Research, 280: 123543.Briard, J., Ayrault, S., Roy-Barman, M., Bordier, L., L'Heritier, M., Azema, A., Syvilay, D. and Baron, S., 2023. Determining the geochemical fingerprint of the lead fallout from the Notre-Dame de Paris fire: Lessons for a better discrimination of chemical signatures. Science of Total Environment, 864: 160676. Thiebault, T., Alliot, F., Berthe, T., Blanchoud, H., Petit, F., Guigon, E., 2021. Record of trace organic contaminants in a river sediment core: From historical wastewater management to historical use. Science of Total Environment, 773: 145694.

Sediment was collected on the quays along the Seine River across Paris City following the flood of March 2024. The objective was to measure a panel of potential contaminants in sediment deposited by the Seine River before the Paris 2024 Olympics. Fallout radionuclide (137Cs, 7Be, 210Pb) activities were analysed by gamma spectrometry using hyperpure germanium detectors at the Laboratoire des Sciences du Climat et de l’Environnement (LSCE, Paris-Saclay, France). Major, minor and trace elemental concentrations were analysed at the same laboratory with an Inductively Coupled Plasma – Mass Spectrometer equipped with 3 quadrupoles (TQ-ICP-MS, Thermo ScientificTM iCAPTM).  Stable radiogenic lead isotope (206Pb, 207Pb, 208Pb) ratios were also determined (Briard et al., 2023). Particle size distribution was analysed with a laser diffraction particle size analyser (Mastersizer 3000 with Hydro LV, Malvern Panalytical) and Total Organic Carbon (TOC) was quantified using a Rock-Eval 6 equipment. Pharmaceutical products and pesticides were analysed following the protocol described by Thiebault et al. (2021), and lifestyle products following the methodology described by Bernier-Turpin et al. (2025).This dataset is described and interpreted in a manuscript submitted for publication in an international journal.ReferencesBernier-Turpin, G., Moilleron, R., Cenik, C., Alliot, F., Guerin-Rechdaoui, S., Thiebault, T., 2025. Do suspended particles matter for wastewater-based epidemiology? Water Research, 280: 123543.Briard, J., Ayrault, S., Roy-Barman, M., Bordier, L., L'Heritier, M., Azema, A., Syvilay, D. and Baron, S., 2023. Determining the geochemical fingerprint of the lead fallout from the Notre-Dame de Paris fire: Lessons for a better discrimination of chemical signatures. Science of Total Environment, 864: 160676. Thiebault, T., Alliot, F., Berthe, T., Blanchoud, H., Petit, F., Guigon, E., 2021. Record of trace organic contaminants in a river sediment core: From historical wastewater management to historical use. Science of Total Environment, 773: 145694.

We present here the results obtained by direct measurement of atmospheric aerosols and total atmospheric deposition using a 14-month time series from the Caribbean region: from 2017-03-27 to 2018-05-28. Both total atmospheric deposition fluxes and ground-based aerosol concentrations are measured in the Guadeloupe Islands. Total deposition velocity, lifetime, and scavenging ratio of major and trace elements (Al, As, Ba, Be, Ca, Co, Cd, Cu, Fe, Li, Mg, Mn, Mo, Na, P, Pb, Rb, S, Sb, Sc, Se, Sr, Ti, Tl, U, V, and REEs) were determined for each paired collected aerosol and total deposition sample.

Following major floods in June 2016, March 2020 and February 2021, sediment has been collected on the quays along the Seine River across Paris City  o investigate potential changes in sediment sources, dynamics and their metal contamination, including lead (Pb). Indeed, the fire that affected Notre-Dame Cathedral in April 2019 reignited concerns from the general public about the associated Pb emissions into the environment. To address this issue, sediment that deposited during significant floods that occurred both before (i.e., June 2016) and after the fire (i.e., March 2020 and February 2021) was analysed. In addition to the analysis of metal contamination (determined by elemental geochemistry and Pb isotope ratios) in sediment, it was also analysed for fallout radionuclide activities, organic matter properties and particle size with the objective to determine their physico-chemical properties, spatial sources and temporal dynamics. Fallout radionuclide activities were determined by gamma spectrometry using hyperpure germanium detectors at the Laboratoire des Sciences du Climat et de l’Environnement (LSCE, Paris-Saclay, France). Particle size distribution was determined using a Malvern Panalytical Mastersizer 3000 instrument at LSCE. Major, minor and trace elemental concentrations were analysed at LSCE with an Inductively Coupled Plasma – Mass Spectrometer equipped with 3 quadrupoles (TQ-ICP-MS, Thermo ScientificTM iCAPTM).  Stable radiogenic lead isotope (206Pb, 207Pb, 208Pb) ratios were also determined at LSCE using the same instrument.TOC and TN elemental concentrations and stable isotope ratios (δ13C, δ15N) were determined by the combustion method using a continuous flow elemental analyser (Elementar VarioPyro cube) coupled with an Isotope Ratios Mass Spectometer (EA-IRMS) at the Institute of Ecology and Environmental Sciences (iEES, Paris, France).This dataset is described and interpreted in a manuscript submitted for publication to the 'Environmental Pollution' journal.

Following major floods in June 2016, March 2020 and February 2021, sediment has been collected on the quays along the Seine River across Paris City  o investigate potential changes in sediment sources, dynamics and their metal contamination, including lead (Pb). Indeed, the fire that affected Notre-Dame Cathedral in April 2019 reignited concerns from the general public about the associated Pb emissions into the environment. To address this issue, sediment that deposited during significant floods that occurred both before (i.e., June 2016) and after the fire (i.e., March 2020 and February 2021) was analysed. In addition to the analysis of metal contamination (determined by elemental geochemistry and Pb isotope ratios) in sediment, it was also analysed for fallout radionuclide activities, organic matter properties and particle size with the objective to determine their physico-chemical properties, spatial sources and temporal dynamics. Fallout radionuclide activities were determined by gamma spectrometry using hyperpure germanium detectors at the Laboratoire des Sciences du Climat et de l’Environnement (LSCE, Paris-Saclay, France). Particle size distribution was determined using a Malvern Panalytical Mastersizer 3000 instrument at LSCE. Major, minor and trace elemental concentrations were analysed at LSCE with an Inductively Coupled Plasma – Mass Spectrometer equipped with 3 quadrupoles (TQ-ICP-MS, Thermo ScientificTM iCAPTM).  Stable radiogenic lead isotope (206Pb, 207Pb, 208Pb) ratios were also determined at LSCE using the same instrument.TOC and TN elemental concentrations and stable isotope ratios (δ13C, δ15N) were determined by the combustion method using a continuous flow elemental analyser (Elementar VarioPyro cube) coupled with an Isotope Ratios Mass Spectometer (EA-IRMS) at the Institute of Ecology and Environmental Sciences (iEES, Paris, France).This dataset is described and interpreted in a manuscript submitted for publication to the 'Environmental Pollution' journal.

A particularly long and dense episode of airborne dust transport crossed Spain, France and part of Europe from 15 to 18 March 2022. This episode led to significant dust deposits on cars, roofs, etc., which may have caused surprise or concern among the general public. Based on association reports, several media published articles stating that this dust contained an artificial radionuclide, cesium-137 (137Cs), the source of which was attributed to the French nuclear tests conducted in the Sahara early in the 1960s.In order to provide a solid and representative scientific basis for a better characterisation of this dust and its radionuclide content, a participatory call for the collection of about ten grams of dust in different sites in France and Europe was launched on 17 March 2022 on the social network Twitter by Olivier Evrard. It was then relayed by Germán Orizaola, generating numerous reactions and the collection of several dozen samples in France, Spain and other neighbouring countries in Europe.The current dataset provides general information about the location/time of sample collection (n=110 samples) and data about the content of dust samples in cesium-137 (137Cs), an artificial radionuclide emitted by nuclear atmospheric tests and accidents (Evrard et al., 2020). Samples (2-80g) were analysed using the ultra-low background Germanium HyperPure gamma spectrometry detectors of LSCE installed in the underground facilities at both University Paris-Saclay (Gif-sur-Yvette) and Modane (Underground Lab of Modane, France). Filters were analysed for 80,000 to 200,000 s to obtain sufficient counting statistics (for the detection of the 137Cs peak at 662 keV). All results were expressed in Bq kg−1 with activities decay-corrected to the sampling date. Counting efficiencies and reliability were conducted using certified International Atomic Energy Agency (IAEA) standards (IAEA-444, 135, 375, RGU-1 and RGTh-1) prepared in the same containers as the samples.Additional data regarding other physico-chemical properties analysed in these dust samples has been added in June 2024.

A particularly long and dense episode of airborne dust transport crossed Spain, France and part of Europe from 15 to 18 March 2022. This episode led to significant dust deposits on cars, roofs, etc., which may have caused surprise or concern among the general public. Based on association reports, several media published articles stating that this dust contained an artificial radionuclide, cesium-137 (137Cs), the source of which was attributed to the French nuclear tests conducted in the Sahara early in the 1960s.In order to provide a solid and representative scientific basis for a better characterisation of this dust and its radionuclide content, a participatory call for the collection of about ten grams of dust in different sites in France and Europe was launched on 17 March 2022 on the social network Twitter by Olivier Evrard. It was then relayed by Germán Orizaola, generating numerous reactions and the collection of several dozen samples in France, Spain and other neighbouring countries in Europe.The current dataset provides general information about the location/time of sample collection (n=110 samples) and data about the content of dust samples in cesium-137 (137Cs), an artificial radionuclide emitted by nuclear atmospheric tests and accidents (Evrard et al., 2020). Samples (2-80g) were analysed using the ultra-low background Germanium HyperPure gamma spectrometry detectors of LSCE installed in the underground facilities at both University Paris-Saclay (Gif-sur-Yvette) and Modane (Underground Lab of Modane, France). Filters were analysed for 80,000 to 200,000 s to obtain sufficient counting statistics (for the detection of the 137Cs peak at 662 keV). All results were expressed in Bq kg−1 with activities decay-corrected to the sampling date. Counting efficiencies and reliability were conducted using certified International Atomic Energy Agency (IAEA) standards (IAEA-444, 135, 375, RGU-1 and RGTh-1) prepared in the same containers as the samples.Additional data regarding other physico-chemical properties analysed in these dust samples has been added in June 2024.

A particularly long and dense episode of airborne dust transport crossed Spain, France and part of Europe from 15 to 18 March 2022. This episode led to significant dust deposits on cars, roofs, etc., which may have caused surprise or concern among the general public. Based on association reports, several media published articles stating that this dust contained an artificial radionuclide, cesium-137 (137Cs), the source of which was attributed to the French nuclear tests conducted in the Sahara early in the 1960s.In order to provide a solid and representative scientific basis for a better characterisation of this dust and its radionuclide content, a participatory call for the collection of about ten grams of dust in different sites in France and Europe was launched on 17 March 2022 on the social network Twitter by Olivier Evrard. It was then relayed by Germán Orizaola, generating numerous reactions and the collection of several dozen samples in France, Spain and other neighbouring countries in Europe.The current dataset provides general information about the location/time of sample collection (n=110 samples) and data about the content of dust samples in cesium-137 (137Cs), an artificial radionuclide emitted by nuclear atmospheric tests and accidents (Evrard et al., 2020). Samples (2-80g) were analysed using the ultra-low background Germanium HyperPure gamma spectrometry detectors of LSCE installed in the underground facilities at both University Paris-Saclay (Gif-sur-Yvette) and Modane (Underground Lab of Modane, France). Filters were analysed for 80,000 to 200,000 s to obtain sufficient counting statistics (for the detection of the 137Cs peak at 662 keV). All results were expressed in Bq kg−1 with activities decay-corrected to the sampling date. Counting efficiencies and reliability were conducted using certified International Atomic Energy Agency (IAEA) standards (IAEA-444, 135, 375, RGU-1 and RGTh-1) prepared in the same containers as the samples.Additional data regarding other physico-chemical properties analysed in these dust samples has been added in June 2024.

A particularly long and dense episode of airborne dust transport crossed Spain, France and part of Europe from 15 to 18 March 2022. This episode led to significant dust deposits on cars, roofs, etc., which may have caused surprise or concern among the general public. Based on association reports, several media published articles stating that this dust contained an artificial radionuclide, cesium-137 (137Cs), the source of which was attributed to the French nuclear tests conducted in the Sahara early in the 1960s.In order to provide a solid and representative scientific basis for a better characterisation of this dust and its radionuclide content, a participatory call for the collection of about ten grams of dust in different sites in France and Europe was launched on 17 March 2022 on the social network Twitter by Olivier Evrard. It was then relayed by Germán Orizaola, generating numerous reactions and the collection of several dozen samples in France, Spain and other neighbouring countries in Europe.The current dataset provides general information about the location/time of sample collection (n=110 samples) and data about the content of dust samples in cesium-137 (137Cs), an artificial radionuclide emitted by nuclear atmospheric tests and accidents (Evrard et al., 2020). Samples (2-80g) were analysed using the ultra-low background Germanium HyperPure gamma spectrometry detectors of LSCE installed in the underground facilities at both University Paris-Saclay (Gif-sur-Yvette) and Modane (Underground Lab of Modane, France). Filters were analysed for 80,000 to 200,000 s to obtain sufficient counting statistics (for the detection of the 137Cs peak at 662 keV). All results were expressed in Bq kg−1 with activities decay-corrected to the sampling date. Counting efficiencies and reliability were conducted using certified International Atomic Energy Agency (IAEA) standards (IAEA-444, 135, 375, RGU-1 and RGTh-1) prepared in the same containers as the samples.Additional data regarding other physico-chemical properties analysed in these dust samples has been added in June 2024.