air quality objectivesAir Quality Objectives included in the Air Quality Regulations 2000 and
(Amendment) Regulations 2002
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| Pollutant | Air Quality Objective | Date to be achieved |
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| Concentration | Measured as | ||
| Benzene | 16.25 ug/m3 | Running annual mean | 31.12.2003 |
| 5ug/m3 | Annual mean | 31.12.2010 | |
| 1,3 butadiene | 2.25ug/m3 | Running annual mean | 31.12.2003 |
| Carbon monoxide |
10.0 mg/m3 |
Maximum daily running 8-hour mean |
31.12.2003 |
| Lead | 0.5 ug/m3 | Annual mean | 31.12.2004 |
| 0.25 ug/m3 | Annual mean | 31.12.2008 | |
| Nitrogen dioxide** | 200 ug/m3, not to be exceeded more then 18 times per year |
1-hour mean |
31.12.2005 |
| 40 ug/m3 | Annual mean | 31.12.2004 | |
| Particles (PM10) (Gravimetric) |
50 ug/m3, not to be exceeded more then 24 times per year |
24-hour mean |
31.12.2004
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| 40 ug/m3 | Annual mean | 31.12.2004 | |
| Sulphur dioxide | 350 ug/m3, not to be exceeded more then 24 times per year |
1-hour mean |
31.12.2004 |
| 125 ug/m3, not to be exceeded more then 3 times per year |
24-hour mean |
31.12.2005 |
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| 266 ug/m3, not to be exceeded more then 35 times per year |
15-minute mean |
31.12.2005 |
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**The objectives for nitrogen dioxide are provisional.
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