Does the DIY purifier work? Test results (1, 2) give a conclusive answer, but this series of pictures gives a visceral answer. I took a picture of the HEPA about every seven days for four weeks. Glad that black gunk’s not stuck in my lungs instead.
In static form, here’s Week 0 and Week 5:
芝加哥大学行为科学系的助理教授; Smart Air创始书呆子。