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Size comparisons for PM particles

Diagram showing size comparisons for PM particles.

Particulate matter (PM) is made up of liquid droplets and solid particles fine enough to be suspended in the air. The smaller the particle the deeper it can travel into a person's lungs. Here particulate sizes are compared to the width of a human hair.

Glossary

Rights: EPA, United States Environmental Protection Agency
Published: 18 June 2008Updated: 10 September 2019Size: 1.24 MB
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