Reduced ozone by air filtration consistently improved grain yield in wheat

Research output: Contribution to journalArticle


This study considered effects of reduced [O-3] on wheat yield. Open-top chamber charcoal filtered air treatments were compared with non-filtered treatments for field-grown wheat. 30 experiments meeting requirements were found, representing nine countries in North America, Europe and Asia. 26 experiments reported improved yield and 4 experiments reduced yield by filtration, a significant positive effect. Average yield improvement was 9%. Average daytime [O-3] was reduced by filtration from 35 to 13 nmol mol(-1). Filtration efficiency was 63% for O-3 and 56% for SO2. For NOx it was observed that NO2 was reduced and NO increased by filtration. Thus, filters convert NO2 to NO. Most experiments reported low or very low [SO2] and [NOx]. Thus, O-3 can be concluded to be the main phytotoxic component in the experiments. Elevated [NO2] was observed in one experiment. The conclusion is that current [O-3] over large parts of the world adversely affect wheat yield. (C) 2010 Elsevier Ltd. All rights reserved.


  • Håkan Pleijel
External organisations
  • External Organization - Unknown
Research areas and keywords

Subject classification (UKÄ) – MANDATORY

  • Earth and Related Environmental Sciences


  • Charcoal filter, Grain mass, Nitrogen dioxide, Nitric oxide, Ozone, Sulphur dioxide, Wheat, Yield
Original languageEnglish
Pages (from-to)897-902
JournalEnvironmental Pollution
Issue number4
Publication statusPublished - 2011
Publication categoryResearch
Externally publishedYes