Schedule AIR QUALITY OBJECTIVES
TABLE
| Substance | Air quality objective levels | Air quality objective dates |
|---|---|---|
| Benzene | 16.25 micrograms per cubic metre or less, when expressed as a running annual mean | 31st December 2003 |
| 1,3 –Butadiene | 2.25 micrograms per cubic metre or less, when expressed as a running annual mean | 31st December 2003 |
| Carbon monoxide | 11.6 milligrams per cubic metre or less, when expressed as a running 8 hour mean | 31st December 2003 |
| Lead | 0.5 micrograms per cubic metre or less, when expressed as an annual mean 0.25 micrograms per cubic metre or less, when expressed as an annual mean | 31st December 2004 31st December 2008 |
| Nitrogen dioxide | 200 micrograms per cubic metre, when expressed as an hourly mean, not to be exceeded more than 18 times a year 40 micrograms per cubic metre or less, when expressed as an annual mean | 31st December 2005 31st December 2005 |
| 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 40 micrograms per cubic metre or less, when expressed as an annual mean | 31st December 2004 31st 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 350 micrograms per cubic metre or less, when expressed as an hourly mean, not to be exceeded more than 24 times a year 266 micrograms per cubic metre or less, when expressed as a 15 minute mean, not to be exceeded more than 35 times a year | 31st December 2004 31st December 2004 31st December 2005 |