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The Air Quality (Wales) Regulations 2000
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PART I
TABLE
AIR QUALITY OBJECTIVES
| Substance/ Air Quality Objective levels | Date by which objective to be achieved |
|---|---|
| Benzene: 16.25 micrograms per cubic metre or less, when expressed as a running annual mean | 31 December 2003 |
| 1, 3 -Butadiene: 2.25 micrograms per cubic metre or less, when expressed as a running annual mean | 31 December 2003 |
| Carbon monoxide: 11.6 milligrams per cubic metre or less, when expressed as a running 8 hour mean | 31 December 2003 |
| Nitrogen dioxide: 200 micrograms per cubic metre or less, when expressed as an hourly mean, not to be exceeded more than 18 times a year | 31 December 2005 |
| Nitrogen dioxide: 40 micrograms per cubic metre or less, when expressed as an annual mean | 31 December 2005 |
| Lead: 0.5 micrograms per cubic metre or less, when expressed as an annual mean | 31 December 2004 |
| Lead: 0.25 micrograms per cubic metre or less, when expressed as an annual mean | 31 December 2008 |
| PM10: 50 micrograms per cubic metre or less, when expressed as a 24 hour mean, not to be exceeded more than 35 times a year | 31 December 2004 |
| PM10 40 micrograms per cubic metre or less, when expressed as an annual mean | 31 December 2004 |
| Sulphur dioxide: 125 micrograms per cubic metre or less, when expressed as a 24 hour mean, not to be exceeded more than 3 times a year | 31 December 2004 |
| Sulphur dioxide: 350 micrograms per cubic metre or less, when expressed as an hourly mean, not to be exceeded more than 24 times a year | 31 December 2004 |
| Sulphur dioxide: 266 micrograms per cubic metre or less, when expressed as a 15 minute mean, not to be exceeded more than 35 times a year | 31 December 2005 |
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