Fine particles (PM2.5)

Definition

Particles with diameters from 100 nm to 2500 nm; the upper limit is 2.5 micrometres.

Used by AQA

Specification 4.2.4.1 · Paper 1

1
Keep the particle classes distinct: nanoparticles are 1–100 nm, fine particles are 100–2500 nm, and coarse particles are 2500–10,000 nm.

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GCSE Chemistry · key term

Particles with diameters from 100 nm to 2500 nm; the upper limit is 2.5 micrometres.

Used by AQA

Specification 4.2.4.1 · Paper 1

1
Keep the particle classes distinct: nanoparticles are 1–100 nm, fine particles are 100–2500 nm, and coarse particles are 2500–10,000 nm.

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