Researchers developed a carbon nanofiber air filter that captures carbon dioxide from indoor air. A life-cycle analysis found the filter is over 92% efficient at removing CO2 after manufacturing, transport, maintenance and disposal. The design removes more CO2 than it adds over its life.
The team tested the idea with experiments and computer models to study retrofitting buildings. If every building filter were replaced, it could remove up to 596 megatonnes of CO2, equal to taking 130 million cars off the road for a year. One 2024 study found replacing standard filters could lower energy bills by up to 21.6%.
The filters are reusable and fit existing HVAC systems. Saturated filters would go to central facilities to recover the CO2 using renewable energy for regeneration.
Difficult words
- nanofiber — very thin fibers used to make materials
- life-cycle analysis — study of environmental impact over a product's life
- manufacturing — process of making products in factories
- retrofit — add new parts to old buildings or systemsretrofitting
- megatonne — unit equal to one million tonnes of weightmegatonnes
- renewable energy — energy from natural sources that renew themselves
- saturated — full of a substance and cannot hold more
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Discussion questions
- Would you like to have this CO2 filter in your home? Why or why not?
- How could lower energy bills change daily life for people?
- Do you think your city could replace building filters with these? Why?
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