An objective is a standard which is to be achieved in a set time scale.
These objectives are applied where people are likely to be regularly present. For example along a busy road it is appropriate to measure concentrations at a building façade of a residential property. It is generally accepted that the concentration at the façade will be similar to that inside the building.
|
Pollutant |
Objective |
Date to be achieved by |
|
|
Concentration (micro grammes per meter cubed) |
Measured as |
||
|
Benzene |
3.25 |
Running annual mean |
31 December 2010 |
|
1,3-Butadiene |
2.25 |
Running annual mean |
31 December 2003 |
|
Carbon Monoxide |
10 |
Running 8-hour mean |
31 December 2003 |
|
Lead |
0.5 |
Annual mean |
31 December 2004 |
|
0.25 |
Annual mean |
31 December 2008 |
|
|
Nitrogen Dioxide |
200 not to be exceeded more than 18 times a year |
1-hour mean |
31 December 2005 |
|
40 |
Annual mean |
31 December 2005 |
|
|
Particles (PM10) |
50 not to be exceeded more than 35 times a year |
24-hour mean |
31 December 2004 |
|
40 |
Annual mean |
31 December 2004 |
|
|
50 not to be exceeded more than 7 times a year |
24 hour mean |
31 December 2010 |
|
|
18 |
Annual mean |
31 December 2010 |
|
|
Sulphur dioxide |
350 not to be exceeded more than 24 times a year |
1-hour mean |
31 December 2004 |
|
125 not to be exceeded more than 3 times a year |
24-hour mean |
31 December 2004 |
|
|
266 not to be exceeded more than 35 times a year |
15-minute mean |
31 December 2005 |