Pin kit · Filters and Replacement

What Is PM2.5? Meaning, and How Air Purifiers Rate It

Name: EPA minimum CADR by room area
Creator: U.S. Environmental Protection Agency
License: https://www.epa.gov/indoor-air-quality-iaq/guide-air-cleaners-home

Every page on this site ships with its own pin artwork, drawn from the same EPA-sourced figures as the article, nothing on the pin that the page cannot prove.

a pin card showing PM2.5 cfm, the minimum clean air delivery rate the particle class the smoke CADR correlates with

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What the pin points at

PM2.5 means fine particles 2.5 microns and smaller, the figure on air quality reports and home monitors. What it means and which CADR rating covers it.

Board: Filters and Replacement
Pillar: Filters & Ratings
Read time: 3 min

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Figures from the U.S. Environmental Protection Agency, retrieved 2026-08-30. This site shows no prices, by policy, the pin does not either.