Invisible plastics in the air are infiltrating our bodies and cities. Scientists reveal the urgent health dangers and outline bold solutions for a cleaner,safer future.

Study: Air pollution and its impacts on health: Focus on microplastics and nanoplastics. Image Credit: Image by 5Gyres,courtesy of oregon State University

A recent review in Ecotoxicology and Environmental safety examines the sources,detection,health impacts,and mitigation of airborne microplastics and nanoplastics.

Experts are calling for immediate action to understand the distribution of these particles and to implement effective public health strategies.

The Pervasive Nature of Airborne Plastics

Microplastics (less than 5 mm) and nanoplastics (less than 1 μm) result from the breakdown of larger plastic items, accumulating in urban and industrial zones. Inhalation, ingestion, or skin absorption of these particles can lead to oxidative stress, inflammation, and chronic diseases, including cardiovascular issues.

Studies have found microplastics in human blood, lung tissue, and vascular plaques. In cities like Zhengzhou and Guangzhou, PM2.5-bound microplastics are particularly concerning due to their ability to penetrate the respiratory system deeply. the prevalence of microplastics in these urban centers underscores the localized nature of the problem.

Indoor air, especially in areas with synthetic textiles and carpets, has higher concentrations of these particles than outdoor air. It’s estimated that the average person inhales about 69,000 plastic particles each year, with indoor exposure being a major contributor. This estimate is based on the daily inhalation of approximately 190 microplastic particles per person.

Polyethylene terephthalate (PET)-based microplastics and nanoplastics are especially worrisome because they can adsorb pollutants like nitrogen dioxide and sulfur dioxide. This adsorption, driven by electrostatic and dispersion forces, depends on the polarity and atomic structure of the pollutants. PET’s adsorption capabilities are comparable to those of carbon-based and metal surfaces.

These adsorbed pollutants can increase the toxicity and environmental persistence of airborne plastics, turning them into carriers of other harmful substances.

Sources and Distribution

Airborne plastic particles originate from various sources, including urban and industrial areas, marine environments, and indoor spaces. Common types include polystyrene, polyethylene, polypropylene, and polyethylene terephthalate (PET). Environmental factors like UV exposure, wind patterns, and seasonal changes also affect their distribution.

Textile fibers are a significant source of indoor microplastics. Activities like wearing and washing synthetic clothes release fibers into the air. Fleece and interlock fabrics are particularly prone to shedding inhalable particles.

Roadside dust, tire wear, and degraded plastic debris from sources like landfill leachate and traffic contribute to outdoor concentrations, creating a complex pollution landscape.

Health Risks and Biological Impacts

Inhaled microplastics and nanoplastics can penetrate the respiratory tract, perhaps