A study of Universidade by Viena has provided new data on the presence of microplastics in the atmosphere. Pesquisadores compared thousands of global measurements with computer model simulations. The work showed that particle emissions from terrestrial sources exceed oceanic emissions by more than 20 times. The discovery challenges previous estimates that placed greater weight on the sea. The article was published in Nature magazine.
Scientists gathered 2,782 individual measurements of atmospheric microplastics taken in different regions of the planet. They then cross-referenced these numbers with results from transport models that incorporated three different sets of emission estimates. The models predicted concentrations and deposits much higher than those observed in reality. In some cases the difference reached several orders of magnitude.
Comparação between measurements and models exposes discrepancies
The median concentrations measured were 0.08 particles per cubic meter over land and 0.003 over the sea. Essa difference of 27 times already indicated that terrestrial emissions needed adjustment. The researchers recalibrated the models separately for land and ocean sources. The process reduced overall emission estimates. Mesmo thus the earth remained the dominant source of particle number.
Adjusted terrestrial emissions amounted to about 6.1 x 10^17 particles per year. The oceanic ones were around 2.6 x 10^16 particles annually. The calculation considers particles in the range of 5 to 100 micrometers. The emitted mass, however, shows the opposite pattern. Oceanic Partículas tend to be larger on average and therefore contribute more in terms of total weight.
- Fontes terrestrial include tire abrasion and clothing fibers
- Resuspensão of already contaminated soils and surfaces
- Atividades urban and industrial daily
- Processos natural in arid or coastal areas
Terra dominates particle number but mass comes more from the ocean
Andreas Stohl lead author of the study explained that the adjusted estimates show more than 20 times more particles emitted on land than in the ocean. Ioanna Evangelou first author added that the mass emitted is greater over the ocean because of the average size of the particles. The data reinforces that atmospheric transport takes microplastics to remote regions, including the poles and high mountains. Once suspended, particles can return to the soil or oceans and worsen contamination in new locations.
The study highlighted that direct sources such as tire wear and synthetic fabrics add to the secondary release from already polluted environments. Ancient Modelos often pointed to the ocean as the main emitter. The new accounts reverse this view for particle number although the question of mass requires further investigation.
Incertezas persists over specific particle size and sources
The authors drew attention to limitations in the current data. The particle size distribution still presents great uncertainty. Medições on the high seas and at different altitudes are also scarce. “The data situation is still not satisfactory and great uncertainties persist”, summarized Stohl. Ele cited the need to distinguish how much comes from traffic and how much from other human activities.
The researchers used a simple scaling method to align simulations with real observations. The adjustment drastically lowered total emissions compared to previous projections. Resultados indicate that the air may contain fewer microplastics than some studies have suggested. Ainda thus global dispersal remains a concern because of the transport capacity of the atmosphere.
Implicações for environmental monitoring and policies
The research paves the way for future refinements in pollutant transport models. Entender improves emissions and helps predict where particles will settle and which ecosystems are most affected. Cientistas advocate expanding monitoring networks with standardized methods. Isso includes more frequent measurements in open oceans and varied urban areas.
The work involved Departamento of Meteorologia and Geofísica of Universidade of Viena. Colaboração included atmospheric transport analysis and multiple database comparison. The publication in Nature took place in early 2026 and is already cited in discussions about global plastic pollution.
- Concentração average over land: 0.08 particles/m³
- Concentração average over sea: 0.003 particles/m³
- Estimated terrestrial Emissões: 6.1 × 10¹⁷ particles/year
- Estimated oceanic Emissões: 2.6 × 10¹⁶ particles/year
- Fator between land and ocean in number of particles: more than 20 times
The study reinforces the importance of actions to reduce the generation of microplastics on the Earth’s surface. Medidas as a replacement material in tires and clothing can directly influence future emissions. At the same time, the scientific community is calling for more investment in research to close the gaps that still exist in the data.
