Some are emitted directly from a source, such as construction sites, unpaved roads, fields, smokestacks or fires. These particles come in many sizes and shapes and can be made up of hundreds of different chemicals. The average human hair is about 70 micrometers in diameter – making it 30 times larger than the largest fine particle. How small is 2.5 micrometers? Think about a single hair from your head.PM 2.5 : fine inhalable particles, with diameters that are generally 2.5 micrometers and smaller. ![]()
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