We can't find the internet
Attempting to reconnect
Something went wrong!
Hang in there while we get back on track
Deposition and clearance of airborne microplastics in the human respiratory tract
AI summary Read the abstract
When you breathe in tiny plastic particles floating in the air, most get trapped in your nose and throat, but the smallest ones can travel deeper into your lungs, and a small amount even reaches your bloodstream. This study found that indoor air tends to have more of these particles than outdoor air, meaning the air inside your home or office could actually be a bigger source of plastic exposure than you'd expect.
Αirborne microplastics (MPs) comprise an important exposure pathway to humans and an emerging health hazard. Published MP concentrations and size distributions were applied to a dosimetry model to determine their deposition and clearance in the human respiratory tract (HRT). Inhaled MPs deposited primarily in the extra-thoracic region with smaller MPs accumulated in the tracheobronchial and alveolar regions. The retained mass after exposure of one day was estimated to range from 5.2 × 10 to 9.48 μg based on different exposure concentrations. Moreover, after one day, approximately 60 % of the deposited MP mass was transferred from the respiratory tract to the oesophagus, 28 % was retained in the respiratory tract, 0.4 % passed into the blood, and a very small amount was transferred to the lymph nodes. Evaluating the long-term response of the dose accumulated in the HRT was governed by a steady-state condition where the accumulated dose reached a fixed value. Constant exposure conditions drove this observation yet in real world MP exposure is not constant and varies across environments and individuals. Analysis of different environments showed that higher dose is received indoors due to the higher measured MP concentrations. Further research is needed to unravel the impact of varying exposure conditions and inclusion of targeted MPs clearance kinetics to improve human body response to MP intake.
More Papers Like This
Microplastics Aloft: A comprehensive exploration of sources, transport, variations, interactions and their implications on human health in the atmospheric realm
AI summary Read the abstract
This review summarizes research on airborne microplastics and finds that indoor environments typically contain far more microplastic particles than outdoor air -- up to 760,000 particles per square meter per day indoors versus a maximum of about 1,159 outdoors. Sources include synthetic clothing, plastic manufacturing, and even ocean spray. Inhaled microplastics can reach deep into the lungs and potentially enter the bloodstream, raising concerns about respiratory and cardiovascular health effects.
Long-term assessment of indoor and outdoor airborne microplastics deposition: size distribution and polymer characteristics
AI summary Read the abstract
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
AI summary Read the abstract
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.
Study of suspended microplastics in indoor air to assess human exposure through inhalation
AI summary Read the abstract
Researchers studied suspended microplastics in indoor air to evaluate human exposure through inhalation. The study measured airborne microplastic concentrations in indoor environments, contributing to the growing body of evidence that inhalation represents a significant and underappreciated route of human microplastic exposure.
Study of suspended microplastics in indoor air to assess human exposure through inhalation
AI summary Read the abstract
Researchers investigated suspended microplastics in indoor air to assess the extent of human exposure through inhalation. The study quantified airborne microplastic particles in indoor settings, providing data on a potentially important but understudied route of daily microplastic intake for the general population.
Research digests by email
When a large batch of papers lands in the Atlas, we read through it and send a short write-up of what stood out.