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Micro- and nano-plastics (MNPs) in urban air: polymer composition, interactions and inhalation risk
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Researchers characterized airborne micro- and nanoplastics in urban air using pyrolysis gas chromatography-mass spectrometry on size-fractionated aerosol samples. The study found total concentrations averaging 0.6 micrograms per cubic meter, with tire wear particles as a dominant source, highlighting an underestimated threat to urban air quality and human respiratory health.
Abstract Airborne micro- and nano-plastics (MNPs) represent a long-time underestimated threat to the urban environment, directly challenging Sustainable Development Goal 3 (Good Health and Well-Being). This study characterizes the concentration and polymer composition of atmospheric MNPs in urban air by analyzing size-fractionated aerosol samples using Pyrolysis-Gas Chromatography-Mass Spectrometry. Total PM 10 MNPs concentrations averaged 0.6 ± 0.2 µg/m 3 , with fine microplastics and coarse microplastics contributing equally. Tire wear particles were dominant, constituting approximately 65% of total MNPs, and car tire tread particles were consistently abundant across all studied size fractions. The identified polymers were strongly correlated with carbonaceous aerosol markers, indicating complex atmospheric interactions. An estimated inhalation of 2.1 µg/day of airborne MNPs, combined with polymer-specific hazard index, may increase the relative risk of cardiopulmonary mortality by up to 9% and lung cancer-related mortality by up to 13%. By integrating exposure, risk assessment, and analytical data, these findings highlight the need for global policy action, emphasizing the value of region-specific research for air quality and public health initiatives.
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Composition, interactions and resulting inhalation risk of micro- and nano-plastics in urban air
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This study characterized airborne micro- and nano-plastics in size-fractionated particulate matter collected in Leipzig, Germany, using pyrolysis gas chromatography mass spectrometry, finding average concentrations of 0.6 µg/m³ with tire wear particles dominating at approximately 65% of total plastics. Exposure and risk assessment indicated that inhaling approximately 2.1 µg of airborne plastic particles daily may increase cardiopulmonary mortality by 9% and lung cancer mortality by 13%, emphasizing the need for global policy action.
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Researchers measured mass concentrations of common microplastics and tire wear rubber particles in urban ambient air, providing quantitative data for inhalation exposure assessment. Tire wear rubber dominated the airborne particle mass in traffic-influenced areas, exceeding concentrations of synthetic polymer microplastics.
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