In this activity related to indoor air pollution, learners build take-home dust catchers with wax paper and petroleum jelly. After a set monitoring period, learners conduct representative particle counts using a comparison grid. Learners will also graph the results. This activity can be enhanced by sharing the "Health Hazards of Lunar Dust" Podcast with learners (see related resource link). This resource includes background information, variation ideas and a handout for learners in both English and Spanish.