Part 1 Group A pollutants: human health-based limit values and alert thresholds
| Population of zone (thousands) | If concentrations exceed the upper assessment thresholdf1 | If maximum concentrations are between the upper and lower assessment thresholds | For nitrogen dioxide and sulphur dioxide in agglomerations where maximum concentrations are below the lower assessment thresholds |
|---|---|---|---|
(1) For NO2 and PM10 to include at least one urban-background station and one traffic-orientated station; this requirement also applies to benzene and carbon monoxide provided that it does not increase the number of sampling points. | |||
| 0—249 | 1 | 1 | not applicable |
| 250—499 | 2 | 1 | 1 |
| 500—749 | 2 | 1 | 1 |
| 750—999 | 3 | 1 | 1 |
| 1,000—1,499 | 4 | 2 | 1 |
| 1,500—1,999 | 5 | 2 | 1 |
| 2,000—2,749 | 6 | 3 | 2 |
| 2,750—3,749 | 7 | 3 | 2 |
| 3,750—4,749 | 8 | 4 | 2 |
| 4,750—5,999 | 9 | 4 | 2 |
| 6,000 or more | 10 | 5 | 3 |
Annotations
Footnotes
- f1
(1)
For NO2 and PM10 to include at least one urban-background station and one traffic-orientated station; this requirement also applies to benzene and carbon monoxide provided that it does not increase the number of sampling points.