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Role of meteorological variables in shaping airborne microplastic concentrations: Evidence from two metropolitan areas in Brazil
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Researchers found that the air in two Brazilian cities contained tiny plastic particles, but the drier, warmer city had up to 30 times more airborne microplastics than the rainier city—suggesting rain helps wash these particles out of the air while heat and dry conditions let them build up and get stirred back into the atmosphere. This matters because it means the amount of plastic you're breathing in may depend heavily on local weather patterns, and as climate patterns shift, some places could see rising exposure to these particles, which have been linked to potential health concerns when inhaled.
Airborne microplastics (MPs) are emerging atmospheric contaminants of growing environmental and health concern. However, knowledge gaps persist concerning their abundance, sources and drivers across many regions, including Latin America. This research targets this gap by reporting MP data collected using filter-based measurements in two Brazilian cities (Curitiba and Londrina) characterised by distinct socio-economic and environmental profiles. MPs were identified by optical microscopy and μ-FTIR, with their heterogeneity quantified using the Microplastic Diversity Integrated Index (MDII). Mean MP concentrations (number per m 3 , expressed as n/m 3 ) exhibited marked differences, between 0.14 and 0.54 n/m 3 in Curitiba (mean ± SD: 0.32 ± 0.14 n/m 3 ) and 1.26–37.13 n/m 3 in Londrina (9.70 ± 11.40 n/m 3 ). The Mann–Whitney test revealed that meteorological conditions differed significantly between the cities: Londrina was drier, warmer and windier than Curitiba. The intercity disparity in MP concentrations suggests that higher rainfall in Curitiba likely enhanced particle removal. Spearman correlation analysis revealed significant positive correlations between MP concentrations and air temperature and pressure, indicating that thermal turbulence likely facilitated particle resuspension. In contrast, MP correlations with wind speed, relative humidity and rainfall were not statistically significant. Fragments (74–79%) and fibres (21–26%) were the primary morphologies, with sizes predominantly <100 μm in both cities. Main petrochemical MPs were polyethylene in Curitiba (65%) and polyamide in Londrina (61%). MP diversity was higher in Londrina (MDII: 0.54) than in Curitiba (MDII: 0.47), driven by broader polymeric and size distributions. These results highlight that even within the same region, contrasting weather patterns can lead to divergent plastic footprints.
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Researchers measured tiny plastic particles falling from the air in three Mexican cities, finding mostly fibers and small fragments. Rainfall showed the strongest link to higher microplastic levels, while wind speed had a moderate connection in two cities and temperature showed little relationship.
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Researchers analysed how monsoon rainfall affected atmospheric microplastic concentrations, finding that precipitation events redistributed plastic particles and temporarily increased concentrations of certain polymer types in air samples. The study identifies rainwater as both a carrier and a concentrating medium for atmospheric microplastics.
Atmospheric microplastics at a southern China metropolis: Occurrence, deposition flux, exposure risk and washout effect of rainfall
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Researchers measured airborne microplastics in Guangzhou, a major city in southern China, finding them throughout the year with higher levels during the rainy season. They estimated that adults in the city inhale tens of thousands of microplastic particles annually through normal breathing. Rainfall helped wash microplastics out of the air, but it also deposited them onto surfaces where they can enter water and soil, creating another pathway for human exposure.
Inhalable airborne microplastics in urban air: single-particle evidence of diurnal variability and physicochemical characteristics
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Scientists found that city air contains tiny plastic particles small enough to breathe deep into your lungs, with levels about 60% higher at night due to weather patterns. Most of these particles were under 10 micrometers (way smaller than a human hair), meaning they're easily inhaled, and many showed signs of weathering that could change how they interact with our bodies. While this study didn't directly test health effects, it confirms these airborne plastics are widespread and sets the stage for future research into what breathing them might mean for our health.
Microplastic Aerosols as Cloud Condensation Nuclei: Implications for Precipitation Patterns, Cloud Microphysics, and Regional Climate Feedback
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Tiny plastic particles floating in the air are changing how clouds form and behave, which could affect where and how much it rains in different parts of the world. This matters because disrupted rainfall patterns could worsen droughts and floods, threatening water supplies and food production in vulnerable regions. The study suggests we need to start tracking these airborne plastics and account for them in climate predictions, since they're currently being ignored despite potentially significant effects on our weather and climate.
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