/2020/08/04/nasa-space-station-air-filtering/ 2020-08-04T00:00:00+00:00 /2020/08/04/MERV-ratings-explained-and-how-they-relate-to-air-purification/ 2020-08-04T19:01:35+00:00 /2020/08/04/air-quality-monitors/ 2020-08-04T19:01:35+00:00 /about/ /air-quality-index /diy-air-filter / /merv-vs-hepa /resources/ /images/pdf/filtrete-merv-vs-mpr.pdf 2022-10-02T04:03:14+00:00 /images/pdfs/NASA_Technical_Memorandum_20170005166.pdf 2022-10-02T04:03:14+00:00 /images/pdfs/miller-leiden-et-al-1996.pdf 2022-10-02T04:03:14+00:00