2 ms·

How about ionizing the air where it's cold and impractical to open the windows? There are nice devices, which have certification, and don't produce ozone. When

How about ionizing the air where it's cold and impractical to open the windows? There are nice devices, which have certification, and don't produce ozone. When I traveled to Europe this year, I saw ionizers in the Munich airport and nowhere else, unfortunately.

iso8859-1 5y ago
Plants also produce negative ions. May be the cheaper and prettier option.
- nikolay 5y ago
  You need a lot of plants though! NASA had some quality studies on types of plants.