The air quality objectives applicable to LAQM in Scotland are set out in the Air Quality (Scotland) Regulations 2000 (SSI No 97), the Air Quality (Scotland) (Amendment) Regulations 2002 (SSI No 297), and the Air Quality (Scotland) Amendment Regulations 2016 (SSI No 162).
The following table lists the air quality objectives for each pollutant in units of micrograms per cubic metre, ug/m3 (milligrams per cubic metre, mg/m3 for carbon monoxide), as well as the number of exceedences in each year that is permitted (where applicable).
Table of Air Quality objective levels (Scotland)
Pollutant
|
Air Quality Objective
|
Date to be
achieved by
|
Concentration
|
Measured as
|
Benzene
|
16.25 ug/m3
3.25 ug/m3
|
running annual
mean
running annual
mean
|
31.12.2003
31.12.2010
|
1,3 Butadiene
|
2.25 ug/m3
|
running annual mean
|
31.12.2003
|
Carbon monoxide
|
10.0 mg/m3
|
running 8-hour mean
|
31.12.2003
|
Lead
|
0.5 ug/m3
0.25 ug/m3
|
annual mean
annual mean
|
31.12.2004
31.12.2008
|
Nitrogen dioxide (NO2)
|
200 ug/m3 not to be exceeded more than 18 times a year
40 ug/m3
|
1 hour mean
annual mean
|
31.12.2005
31.12.2005
|
Particles (PM10) (gravimetric)
|
50 ug/m3 not to be exceeded more than 35 times a year
40 ug/m3
50 ug/m3 not to be exceeded more than 7 times a year
18 ug/m3
|
24 hour mean
annual mean
24 hour mean
annual mean
|
31.12.2004
31.12.2004
31.12.2010
31.12.2010
|
Particles (PM2.5)
|
10ug/m3
|
annual mean
|
31.12.2020
|
Sulphur dioxide (SO2)
|
350 ug/m3 not to be exceeded more than 24 times a year
125 ug/m3 not to be exceeded more than 3 times a year
266 ug/m3 not to be exceeded more than 35 times a year
|
1 hour mean
24 hour mean
15 minute mean
|
31.12.2004
31.12.2004
31.12.2005
|
