http://www.super-science-fair-projects.com/super-science-fair-projects-blog/12th-grade-science-fair-projects/ozone-air-filters-are-they-safe/ The Super Science Fair Projects Blog is a place to get science fair project ideas, topics and experiments-to ask questions and get answers from other parents, teachers and students. Wed, 28 Jul 2010 07:49:38 +0000 hourly 1 http://wordpress.org/?v=3.3.1