Intervention

Activated carbon adsorption

Part of: Air filtration and air purifiers

Also: adsorption, carbon filter

Porous carbon that traps gas molecules on its enormous internal surface. It is the standard way to remove volatile organic compounds, odours and some ozone from air, complementing particle filters that cannot capture gases.

G-0069 · Updated 5 September 2026 · Coridum Research

Why it matters indoors

A gram of activated carbon has the surface area of several tennis courts; volatile compounds adsorb to it until the pores saturate, after which the filter must be replaced or regenerated. Capacity depends on the compound (large, non-polar molecules adsorb well; formaldehyde and other small polar gases poorly unless the carbon is chemically impregnated) and on humidity, which competes for sites. In purifiers, a thin carbon mesh does little; a few kilograms of granular carbon does a great deal.

In the literature

  1. Comparison of the volatile organic compound recovery rates of commercial active samplers for evaluation of indoor air quality in work environments (2017). doi:10.1007/s11869-017-0465-0 CKB 0147
  2. Sadovnik Metal-organic frameworks based on pyrazolates for the selective and efficient capture of formaldehyde (2024). Nat Commun. doi:10.1038/s41467-024-53572-z CKB 1129
  3. The Toxic Price of Beauty: Impact of Common Nail and Hair Care Products on Indoor Air Quality and Effectiveness of Air Purification (2025). Cureus. doi:10.7759/cureus.95720 CKB 1101

Studies in the Coridum Knowledge Base in which this term is used. The definition follows standard usage in WHO, ISO and textbook sources; it is not quoted from these papers.

CKB = document number in the Coridum Knowledge Base, our curated library of peer-reviewed studies. Follow the DOI for the original paper.