Improving Filtration Efficacy of Medical Face Masks

Ilpo Kulmala (Corresponding Author), Kimmo Heinonen, Satu Salo

Research output: Contribution to journalArticleScientificpeer-review

8 Citations (Scopus)


We built a simple unipolar positive corona charger and tested it with five different medical face masks. Charging the particles significantly enhanced the filtration efficiencies of all of the masks in terms of the submicron fraction, with an average increase of from 58 to 93% for 0.3 µm particles. Simultaneously, the pressure drop remained practically the same, showing the high potential in using electret media. However, the corona discharge generated ozone, which is an issue that must be addressed. These results contribute to the development of effective solutions against airborne threats.
Original languageEnglish
Article number200043
JournalAerosol and Air Quality Research
Issue number6
Publication statusPublished - Jun 2021
MoE publication typeA1 Journal article-refereed


  • Medical face mask
  • Filtration efficiency
  • Charging
  • Bioaerosols


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