Comparing Home Air Purifiers: What the Data Actually Shows and Why Filter Grade Matters More Than Most People Realize
I've spent a significant amount of time this year going deep on air purifier research — reading independent lab studies, comparing certification standards, and trying to understand what the specifications actually mean in practice rather than just accepting brand claims at face value. I want to share what I found because most comparison content online either oversimplifies the technology or focuses on price without explaining what drives the performance differences. The Variables That Actually Matter When Comparing Units Most people shopping for an air purifier compare three things: coverage area, price, and brand recognition. Those are reasonable starting points but they miss the variables that most directly determine real-world performance. Filter grade is the most important variable and the least discussed. The HEPA designation covers a range of filtration standards that are not interchangeable. HEPA 13 — the grade used in the majority of consumer air purifiers including well...