(15)

‘ultrafine particles’ or ‘UFP’ means particles with a diameter less than or equal to 100 nm, where UFP are measured as the particle number concentrations per cubic centimetre for a size range with a lower limit of 10 nm and for a size range with no restriction on the upper limit;

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Source: EUR-Lex (Cellar) · retrieved 2026-10-16 · Text as adopted (Official Journal); later amendments are not incorporated in this text.