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District. Concentrations of CO monitored during 2001 at the Reading site are shown in Table 4.1.

Criteria

Reading

Annual mean

0.4

Maximum running 8 hour mean

2.7

Table 4.1

Monitored concentrations 2001 - CO (mg/m3)

AQO (2003)

-

10.00

The monitored annual mean concentration is similar to the maximum background concentration estimated in West Berkshire. The maximum running annual mean does not exceed the AQO of 10 mg/m3 in 2001 and this is likely to be the case in West Berkshire.

4.3

Emission Sources

Defra guidance has identified those sources that are likely to contribute to the maximum emission of relevant pollutants. Appendix B lists Part A and B authorised processes identified by WBC. Although emissions of CO are likely to occur from a number of processes, such as iron and steel and halogen processes, within the guidance a review of industrial emission sources is not required for CO.

4.3.1

Road Transport

Road traffic data have been provided by WBC and are detailed in Appendix A. Guidance specifies that where AADT flows are not expected to exceed 80,000 or 140,000 vehicles per day (single carriageway and motorway, respectively) and annual mean concentrations are expected to be below 1 mg/m3 in 2003, a screening assessment will not be required.

No roads within the WBC region have been identified with existing or predicted AADT flows

exceeding 80,000 vehicles.

Background data indicate that the

concentration in 2003 will be 0.32 mg/m3 (based on 2001 data). It further assessment of road transport sources for CO is not required.

is

maximum annual mean therefore considered that

4.4

Summary and Recommendation

A review of background monitoring data indicates that the maximum running 8-hour mean objective is likely to be achieved in 2003. Industrial source and road transport information provided by WBC, has been reviewed in line with new Government guidance and are considered unlikely to release significant emissions of CO.

A Detailed Assessment of CO is not required.

A Progress Report should identify any changes to the data utilised within this review and be completed by April 2004.

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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