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Nanofiber air filter captures CO2 and cuts building energy use — Level A1 — a close up of a metal surface with holes

Nanofiber air filter captures CO2 and cuts building energy useCEFR A1

16 Dec 2025

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Adapted from U. Chicago, Futurity • CC BY 4.0

Photo by Shawn Celavie ❤️🇨🇦, Unsplash

Level A1 – Beginner
2 min
74 words
  • A new air filter captures CO2 indoors.
  • It can fit in many building ventilation systems.
  • The filter is reusable and easy to regenerate.
  • Buildings then need less fresh outside air.
  • Heating and cooling systems use less energy.
  • This change can lower people’s energy bills.
  • Saturated filters are collected and sent for processing.
  • Solar heat can release the captured CO2.
  • Lower indoor CO2 helps people feel more alert.
  • The idea could help reduce pollution citywide.

Difficult words

  • capture — take and keep gas or particles
    captures
  • ventilation — movement of fresh air in a building
  • reusable — can be used again many times
  • regenerate — make something ready to use again
  • saturated — full of liquid or gas
  • pollution — dirty air or water in the environment

Tip: hover, focus or tap highlighted words in the article to see quick definitions while you read or listen.

Discussion questions

  • Would you have this filter in your house?
  • Do you like the idea of lower energy bills?
  • Do you feel different when indoor air is fresh?

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