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4.

Carbon Monoxide

4.1

Conclusions of Phase 1 Review and Assessment

During the first round of Review and Assessment, Defra guidance4 indicated that it was unlikely that road transport emissions would result in an exceedence of the AQO for CO. However, to confirm that road emissions were not a significant source within West Berkshire a DMRB assessment was undertaken at Stage 2. The assessment did not identify any roads where current or projected flows would be likely to result in an exceedence of the AQO. Further assessment for potential emissions of CO was therefore not required.

4.2

Estimated and Monitored Data

WBC currently does not monitor CO concentrations within its region. Estimated annual mean background CO concentrations have been compiled and mapped for the UK on a 1 km x 1 km basis5. Details of background concentrations in West Berkshire during 2001 and 2003 have been collated and are detailed in Table 4.1 below.

2001

0.39

0.20

0.26

-

2003

0.32

0.17

0.22

10

AQO (8-hour mean)

Table 4.1

Estimated annual mean background concentrations - CO (mg/m3)

Year

Maximum

Minimum

Mean

Due to the poor relationship between the running 8-hour mean and annual mean concentrations, it is not possible to predict the 2003 8-hour mean concentrations for comparison against the AQO. However, existing concentrations recorded across the UK indicate that it is unlikely that the objective of 10 mg/m3 will be exceeded, unless there are significant local sources.

National Monitoring Data

Data from the UK automatic urban and rural monitoring network (AURN) at Reading has been collated. The Reading site represents an urban background location and is likely to recorded concentrations similar to those experienced within urbanised areas in the West Berkshire

4 Review and Assessment: Technical Guidance (LAQM.TG4(00)). Transport and the Regions. 2000.

Department of the Environment,

5 UK National Air Quality Information Archive, Local Air Quality Management. www.airquality.co.uk. NETCEN. 2003.

h:\projects\em-260\10000 projects\10151 aq w.berks r&a - phase 2\d design\reporting\10151 aq final u&sa.doc10151-01

May 2003

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