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The Air Quality Limit Values Regulations 2001
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PART IUpper and lower assessment thresholds
The following upper and lower assessment thresholds will apply:
(a)
SULPHUR DIOXIDE
| Health protection | Ecosystem protection | |
|---|---|---|
| Upper assessment threshold | 60% of 24-hour limit value (75 μg/m3), not to be exceeded more than 3 times in any calendar year | 60% of winter limit value (12 μg/m3) |
| Lower assessment threshold | 40% of 24-hour limit value (50 μg/m3), not to be exceeded more than 3 times in any calendar year | 40% of winter limit value (8 μg/m3) |
(b)
NITROGEN DIOXIDE AND OXIDES OF NITROGEN
| 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 (140 μg/m3), not to be exceeded more than 18 times in any calendar year | 80% of limit value (32 μg/m3) | 80% of limit value (24 μg/m3) |
| Lower assessment value | 50% of limit value (100 μg/m3), not to be exceeded more than 18 times in any calendar year | 65% of limit value (26 μg/m3) | 65% of limit value (19.5 μg/m3) |
(c)
PARTICULATE MATTER
| 24-hour average | Annual average | |
|---|---|---|
| Upper assessment threshold | 60% of limit value (30 μg/m3), not to be exceeded more than seven times in any calendar year | 70% of limit value (14 μg/m3) |
| Lower assessment threshold | 40% of limit value (20 μg/m3), not to be exceeded more than seven times in any calendar year | 50% of limit value (10 μg/m3) |
(d)
LEAD
| Annual average | |
|---|---|
| Upper assessment threshold | 70% of limit value (0.35 μg/m3) |
| Lower assessment threshold | 50% of limit value (0.25 μg/m3) |
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