GMT: Fri 24 Nov 2017 07:06
Enviro Technology Services - www.et.co.uk

Air Pollution in ET for Fri 24 Nov 2017:

LOW
MODERATE
HIGH
VERY HIGH

The overall air pollution in ET: value 1 out of 10 (1 = lowest, 10 = highest)D |
 

Frequently asked questions

What are the key air quality pollutants?

Although there are many hundreds of individual pollutants, the UK Government has set air quality objectives for 7 compounds and is considering others. The current air quality objectives set in regulations are listed below:

Pollutant Concentration Measured as Examples of sources
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.
5 g/m3 (1.5ppb) Annual mean
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.
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.
Nitrogen dioxide
(NO2)
200 g/m3 (105ppb) 1 hour mean Combustion processes particularly vehicle emissions.
40 g/m3 (21ppb) Annual mean
Lead
(pB)
0.5 g/m3 Annual mean Main source in ambient air from leaded petrol (4 Star)
0.25 g/m3 Annual mean ( by 2008)
Particles
(PM 10)
50 g/m3 24 hour mean Many sources but particularly from diesel vehicle emissions in towns and cities.
40 g/m3 Annual mean
Sulphur dioxide
(SO2)
350 g/m3 (132 ppb) 1 hour mean Mainly from combustion of fossil fuels.
125 g/m3 (47 ppb) 24 hour mean
266 g/m3 (100 ppb) 15 minute mean
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.
See also:
Please click on a question below to see the answer on the left ...
Pollution glossary
2
Benzene (C6H6)
3
Black Carbon
6
Ozone (O3)
7
PM10
9
Solar radiation
11
Toluene
12
Xylene
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