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Elevated indoor levels of plastic- and rubber-derived contaminants in gym environments
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Gym air contains way more microplastics and chemicals from plastics and rubber (like the stuff in yoga mats, flooring, and equipment) than outdoor air — sometimes 10 to 100 times higher. Since these chemicals can be inhaled during workouts when you're breathing harder and faster, and younger people may absorb even more relative to their body weight, gyms may be an overlooked source of exposure that's worth studying further, even though the health effects of breathing this stuff in aren't fully known yet.
Gyms are widely regarded as health-promoting microenvironments with intense human activity and abundant synthetic materials, yet the burden of emerging contaminants in these spaces remains poorly understood. Here, we report high concentrations of microplastics (MPs) and associated polymer additives in the indoor air of typical gyms, including plasticizers (phthalate esters, PAEs), antioxidants ( p -phenylenediamines, PPDs), and their quinone derivatives (PPD-Qs). Median concentrations of PPDs/PPD-Qs (503 pg/m 3 ), MPs (2069 ng/m 3 ), and particle-phase PAEs (2163 ng/m 3 ) in gym PM 2.5 were one to two orders of magnitude higher than outdoor levels, while PAEs showed pronounced accumulation in the gas phase, indicating that both particle-bound and gaseous fractions should be considered. Gym aerosols exhibited a distinct chemical fingerprint enriched in parent PPDs, suggesting possible contributions from rubber-associated additives in indoor synthetic materials. Exposure assessment further revealed that younger groups showed higher body-weight-normalized intake under the modeled exposure scenarios, with MPs contributing the largest intake among the target contaminant classes. These findings identify gyms as underrecognized exercise-related indoor microenvironments for potential co-exposure to plastic- and rubber-derived contaminants, supporting future monitoring, exposure assessment, and low-emission material design in sports environments.
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This review pulls together existing research showing that the air inside your home or office likely contains more tiny plastic particles (microplastics) than the air outside, coming from everyday things like household dust, synthetic fabrics, cleaning products, and packaging. Since most of us spend the majority of our time indoors, this matters because we're likely inhaling and ingesting more of these particles than previously realized, though scientists still don't fully understand the health risks. The researchers stress that more studies are needed to pin down exact dangers and figure out how to reduce this exposure at home.
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This review examines microplastic and microfiber contamination in indoor environments like homes, schools, and workplaces, finding that indoor air and dust often contain more microplastics than outdoor air. Indoor sources like furniture, textiles, and synthetic materials constantly shed tiny plastic fibers that people inhale, ingest, and absorb through skin contact. The review highlights that indoor microplastic exposure, especially through breathing, may be a more significant route of human exposure than previously thought.
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Researchers found that indoor air had roughly ten times more microplastic particles settling out of it than outdoor air, with hallways especially prone to buildup, likely from foot traffic stirring up dust. Since most of these particles were small enough to potentially be inhaled deep into the lungs, and we spend most of our time indoors, this suggests indoor spaces may be a bigger source of microplastic exposure than previously assumed.
Airborne Microplastics in Indoor Environments of Nanjing, China: Characteristics and Inhalation Exposure
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Researchers found that indoor air, like classrooms, offices, and garages, contains way more tiny plastic particles (nearly 5 times more) than outdoor air, and most of these particles are so small they can stay floating and be breathed in easily. Since people spend most of their time indoors, and different rooms had different levels and types of plastic exposure, this suggests that how much plastic we're breathing in daily depends heavily on where we spend our time, not just a general "indoor average." More research is needed to understand what these inhaled plastics mean for our health, but this study shows the exposure is real and varies by location.
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When a large batch of papers lands in the Atlas, we read through it and send a short write-up of what stood out.