Paragraph
England and Wales
The following upper and lower assessment thresholds will apply:
SULPHUR DIOXIDE
(a)
| Health protection | Ecosystem protection | |
|---|---|---|
| Upper assessment threshold | 60% of 24-hour limit value (75μg/m3, not to be exceeded more than 3 times in any calendar year) | 60% of winter limit value (12μg/m3) |
| Lower assessment threshold | 40% of 24-hour limit value (50μg/m3), not to be exceeded more than 3 times in any calendar year) | 40% of winter limit value (8μg/m3) |
NITROGEN DIOXIDE AND OXIDES OF NITROGEN
(b)
| Hourly limit value for the protection of human health (NO2) | Annual limit value for the protection of human health (NO2) | Annual limit value for the protection of vegetation (NOx) | |
|---|---|---|---|
| Upper assessment value | 70% of limit value (140μg/m3, not to be exceeded more than 18 times in any calendar year) | 80% of limit value (32μg/m3) | 80% of limit value (24μg/m3) |
| Lower assessment value | 50% of limit value (100μg/m3, not to be exceeded more than 18 times in any calendar year). | 65% of limit value (26μg/m3) | 65% of limit value (19.5μg/m3) |
PARTICULATE MATTER M1
(c)
| 24-hour average | Annual average | |
|---|---|---|
| Upper assessment threshold | 60% of limit value (30μg/m3, not to be exceeded more than seven times in any calendar year). | 70% of limit value (14μg/m3) |
| Lower assessment threshold | 40% of limit value (20μg/m3, not to be exceeded more than seven times in any calendar year). | 50% of limit value (10μg/m3) |
LEAD
(d)
| Annual average | |
|---|---|
| Upper assessment threshold | 70% of limit value (0.35μg/m3) |
| Lower assessment threshold | 50% of limit value (0.25μg/m3) |
BENZENE
(e)
| Annual average | |
|---|---|
| Upper assessment threshold | 70% of limit value (3.5μg/m3) |
| Lower assessment threshold | 40% of limit value (2μg/m3) |
CARBON monoxide
(f)
| Eight-hour average | |
|---|---|
| Upper assessment threshold | 70% of limit value (7 mg/m3) |
| Lower assessment threshold | 50% of limit value (5 mg/m3) |
Annotations
Marginal citations
- M1
The upper and lower assessment thresholds for PM
10
are based on the indicative limit values for 1 January 2010, which will be reviewed in the light of further information on health and environmental effects, technical feasibility and experience in the application of the existing “Stage 1" limit values.See Article 10 of Directive 99/30/EC.