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Air particles from areas of

User VBart
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1 Answer

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15 votes

Answer:

Size comparisons for PM particles. PM stands for particulate matter (also called particle pollution): the term for a mixture of solid particles and liquid droplets found in the air. Some particles, such as dust, dirt, soot, or smoke, are large or dark enough to be seen with the naked eye.

Step-by-step explanation:

User Tomkot
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