| Concept URI | http://dd.eionet.europa.eu/vocabulary/aq/pollutant/6024 | 
|---|---|
| Preferred label | Ultra Fine Particles (UFPs) with a lower limit of 4 nanometers and no restriction on the upper limit - recommended unit: particles.cm-3 | 
| Definition | Ultra Fine Particles (UFPs) means particles with a diameter less than or equal to 100 nanometers (10^-9 m), where UFP are measured as the particle number concentrations per cubic centimetre for a size range with a lower limit of 4 nm and for a size range with no restriction on the upper limit - PLEASE USE /6003 FOR REPORTING UFP ACCORDING TO RECAST EU 2024/2881 | 
| Notation | UFPs >4nm | 
| Status | Valid | 
| Status Modified | 2025-05-26 | 
| Accepted Date | 2025-05-26 | 
| Not Accepted Date | |
| Mandatory unit | 
European Environment Agency
                        
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