Fine Particulate Matter (PM2.5)
EU annual/period limit for PM2.5 is 25 µg/m³ - lower limit-value tercile; the legal number itself is already tight.
EU limit value
25 µg/m³
annual mean. Directive 2008/50/EC.
WHO 2021 guideline
5 µg/m³
annual mean
Tight numeric EU ceiling for PM2.5
PM2.5 carries a lower-tercile Directive number (25 µg/m³). Even before the WHO comparison, the legal ceiling is among the stricter numeric bars on this site.
Primary sources: Combustion (vehicles, heating, industry), wood-burning, agricultural ammonia.
Health impact: Penetrates deep into lungs and bloodstream. Strongly linked to cardiovascular and respiratory disease, lung cancer, and premature mortality. WHO classifies as Group 1 carcinogen.
Measurement method: Reference: Gravimetric, EN 12341. Equivalent: Beta-attenuation, optical (TEOM, optical particle counter)
Directive ceiling 25 µg/m³ versus WHO 2021 guideline 5 µg/m³ (5.0×). The October 2024 Directive revision schedules further tightening toward 2030.
Top stations measuring Fine Particulate Matter (PM2.5)
| Station | City | Country | Type | Annual mean |
|---|---|---|---|---|
| Warsaw-Marszalkowska | Warsaw | PL | traffic | 18.4 µg/m³ |
| Krakow-Krasinskiego | Krakow | PL | traffic | 18.4 µg/m³ |
| Sofia-Orlov most | Sofia | BG | traffic | 17.9 µg/m³ |
| Bratislava-Kamenne namestie | Bratislava | SK | traffic | 17.5 µg/m³ |
| Nicosia-Centre | Nicosia | CY | traffic | 16.6 µg/m³ |
| Bucharest-Cercul Militar | Bucharest | RO | traffic | 16.1 µg/m³ |
| Ljubljana-Center | Ljubljana | SI | traffic | 16.1 µg/m³ |
| Milan-Pascal | Milan | IT | traffic | 16 µg/m³ |
| Naples-Centro | Naples | IT | traffic | 16 µg/m³ |
| Athens-Piraeus | Athens | GR | traffic | 15.3 µg/m³ |
| Prague-Legerova | Prague | CZ | traffic | 14 µg/m³ |
| Barcelona-Eixample | Barcelona | ES | traffic | 12.8 µg/m³ |
| Valletta-Msida | Msida | MT | traffic | 12.5 µg/m³ |
| Zagreb-Centar | Zagreb | HR | background | 12.2 µg/m³ |
| Rome-Arenula | Rome | IT | background | 11.8 µg/m³ |
| Budapest-Erzsebet ter | Budapest | HU | background | 11.8 µg/m³ |
| Vienna-Taborstrasse | Vienna | AT | traffic | 11.4 µg/m³ |
| Riga-Brivibas iela | Riga | LV | traffic | 11.4 µg/m³ |
| London-Marylebone Road | London | GB editorial composite, not an EEA AEI value | traffic | 11.3 µg/m³ |
| Birmingham-Centre | Birmingham | GB editorial composite, not an EEA AEI value | traffic | 11.3 µg/m³ |
† Country GB (United Kingdom): the UK is not in EEA Air Quality Status Report 2025 Table 3, so these stations' modelled PM2.5 derives from an editorial national composite, not an EEA Average Exposure Indicator. They are ranked here for reference beside stations modelled from EEA AEI values.
Common European air pollutants · All pollutants with station rows
Source: European Environment Agency, Average Exposure Indicator / Burden of Disease (wired extract, August 2026).
Source: World Health Organization Global Air Quality Guidelines, 2021 update.