How small is a PM2.5 particle compared to the diameter of a human hair?
Answer
Approximately one-thirtieth the diameter of a human hair
Particulate matter categorization hinges on size, measured in micrometers (μm). PM2.5 particles are defined as those measuring 2.5 micrometers or less in diameter. This size is remarkably small, quantified specifically by noting that PM2.5 is approximately one-thirtieth the diameter of a typical human hair. This minute scale is critical because it allows these fine particles to bypass the body's initial defense mechanisms, such as the hairs found in the nose and throat, and proceed deep into the delicate lower airways, specifically burrowing into the lungs.
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