Get Plastic Out

Get Plastic Out · The Tuesday letter · Checked 17 September 2026

Plastic in the air of all 30 homes

30 of 30

homes had plastic in their 24-hour air sample, all of them carpeted

Air is the one exposure you cannot put down. A Birmingham team sampled it at home and at work, and we read what they counted. The gap between the two, and the free habit for this week, are below.

What they found

A research team in Birmingham, UK, ran air pumps for 24 hours in 30 homes and 30 workplaces, while glass dishes at head height caught what settled out of the air. The homes had more plastic in their air: 15.6 particles per cubic metre on average, against 13.1. Looking for a reason, the team found that every home was carpeted, but 13 of the workplaces were not.

They split the workplaces by floor, and the gap followed the carpet. Air in uncarpeted workplaces held 9.5 plastic particles per cubic metre on average. Carpeted workplaces held 15.8, about two-thirds more, and homes 15.6. The dishes told the same story: 2,365 particles settled per square metre per day without carpet, against 3,797 in carpeted workplaces and 3,735 in homes. Only particles of 10 micrometres (a hundredth of a millimetre) and up were counted, using a fluorescence microscope, and infrared scanning (µFTIR, which identifies a material by the light it absorbs) checked particles against known plastics, matching 1,400 across the whole study.

Evidence: Emerging

Why it matters

Plastic turned up in the 24-hour air sample from every one of the 30 homes, all of them carpeted: from 3.8 to 33.6 particles per cubic metre, counting only particles of 10 micrometres and up. From these measurements, the authors modelled that UK adults breathe in about 197 such particles a day from indoor air, and toddlers about 67. That is exposure and a modelled estimate, not a health effect.

Evidence: Weak

The swap

Vacuum once a week, carpets and rugs first

Start with carpets and rugs. In the largest study (108 homes, 29 countries), more vacuuming went with less plastic in dust, but twice a week did no better than once in Tehran, and cleaning more often made no clear difference to Birmingham air. No need to rip up carpet that works for you. Uncarpeted Birmingham workplaces had less, but hard floors aren't plastic-free: in Sydney homes without carpet, vinyl-type fibres led. Air purifiers are barely studied for microplastics; we don't suggest one.

Cost: Free · Swap rating: Likely

What we don't know yet

Here the carpet link rests on 13 uncarpeted and 17 carpeted workplaces, each sampled on one day across 16 months, so season and other differences aren't ruled out: the same lab's monthly sampling of two homes and three offices found air averages of 6.5 per m³ in autumn and 11.1 in summer. In Kuwait, carpet made no significant difference. We found no trial of extra vacuuming. Intakes are modelled.

Sources

  1. Ageel HK, Harrad S, Abdallah MA-E (2024). Microplastics in indoor air from Birmingham, UK: Implications for inhalation exposure. Environmental Pollution 362:124960. https://doi.org/10.1016/j.envpol.2024.124960
  2. Soltani NS, Taylor MP, Wilson SP (2021). Quantification and exposure assessment of microplastics in Australian indoor house dust. Environmental Pollution 283:117064. https://doi.org/10.1016/j.envpol.2021.117064
  3. Soltani NS, Taylor MP, Wilson SP (2022). International quantification of microplastics in indoor dust: prevalence, exposure and risk assessment. Environmental Pollution 312:119957. https://doi.org/10.1016/j.envpol.2022.119957
  4. Khodarahmi Z et al. (2025). Settleable microplastics in residential buildings in a Middle Eastern area during warm and cool seasons; quantification, characterization, and human exposure assessment. Environmental Research 273:121251. https://doi.org/10.1016/j.envres.2025.121251
  5. Uddin S et al. (2022). A Preliminary Assessment of Size-Fractionated Microplastics in Indoor Aerosol - Kuwait's Baseline. Toxics 10(2):71. https://doi.org/10.3390/toxics10020071
  6. Yeh PW, Jung CC (2026). Impact of air cleaner on indoor microplastic pollution in a real indoor environment: Roles of ventilation types, weather conditions, and air pollutants. Environmental Pollution 397:128003. https://doi.org/10.1016/j.envpol.2026.128003
  7. Stubbings WA et al. (2026). Seasonal variation of microplastics in indoor environments from Birmingham, UK: Implication for ingestion and inhalation exposure. Chemosphere 399:144898. https://doi.org/10.1016/j.chemosphere.2026.144898

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