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 |