In air pollution "PM" stands for Particulate Matter. The matter is sub classified into:
- Suspended particulate matter (SPM)
- Respirable particles
- Inhalable coarse particle between 2.5 and 10 micrometres (μm) diameter
- Fine particles having a diameter of 2.5 μm or less
- PM2.5
- PM10
- Ultrafine particles
- Soot
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