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Index Banded Annual Totals for Swansea:
LOW
98 days
MODERATE
88 days
HIGH
2 days
VERY HIGH
13 days

Frequently asked questions

What are the key air quality pollutants?

The Air Quality (Wales) Regulations 2000 and Air Quality (Amendment)(Wales)  Regulations 2002 set air quality objectives for the 7 key pollutants contained within the UK National Air Quality Strategy. The current air quality objectives set in regulation are listed below:

Pollutant Concentration Measured as Examples of sources Permitted number of exceedences allowed Compliance date
Benzene*
(C6 H6)
16.25 g/m3 (5ppb) Running annual mean Constituent of petrol emitted as un-burnt fuel or through evaporation (motor vehicles etc). Also present in cigarette smoke.
n/a
31 Dec 2003
5 g/m3 (1.5ppb) Annual mean
n/a
31 Dec 2010
1,3-Butadiene* 2.25 g/m3 (1 ppb) Running annual mean Used in the manufacture of synthetic chemicals and rubber. Also present in cigarette smoke.
n/a
31 Dec 2003
Carbon monoxide (CO) 10.00 m g/m3 (8.6ppm) Maximum daily running 8 hour mean Vehicle emissions, inefficient combustion of most fuels including gas, coal and oil.
n/a
31 Dec 2003
Nitrogen dioxide
(NO2)
200 g/m3 (105ppb) 1 hour mean Combustion processes particularly vehicle emissions.
18
31 Dec 2005
40 g/m3 (21ppb) Annual mean
n/a
31 Dec 2005
Lead
(pB)
0.5 g/m3 Annual mean Main source in ambient air from leaded petrol (4 Star)
n/a
31 Dec 2004
0.25 g/m3 Annual mean ( by 2008)
n/a
31 Dec 2008
Particles
(PM 10)
50 g/m3 24 hour mean Many sources but particularly from diesel vehicle emissions in towns and cities.
35
31 Dec 2004
40 g/m3 Annual mean
n/a
31 Dec 2004
Sulphur dioxide
(SO2)
350 g/m3 (132 ppb) 1 hour mean Mainly from combustion of fossil fuels.
24
31 Dec 2004
125 g/m3 (47 ppb) 24 hour mean
3
31 Dec 2004
266 g/m3 (100 ppb) 15 minute mean
35
31 Dec 2005
Key
g/m3 = (microgram per cubic metre of air)
mg/m3 = (milligram per cubic metre of air)
ppb = (part per billion) or one part of the pollutant per one billion parts of air.
ppm = (part per million) or one part of the pollutant per million parts of air.

For more information on air quality guidelines and statistics please visit the links section.

Pollution glossary: