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21

Criteria

2001

Maximum hourly mean

Annual mean

2005

Annual mean

2010

Annual mean

NO2 AQO

NO2

NOx

200

113

720

40

32

66

40

28.54

-

40

23.49

-

Table 8.5

Continuous NOx and NO2 monitoring data from Reading (µg/m3)

The monitored concentrations indicate that the maximum hourly mean objective of 200 µg/m3 is unlikely to be exceeded at the Reading site. Annual mean concentrations in 2001 and estimated concentrations in 2005 and 2010 are also below the objective level of 40 µg/m3. The annual mean concentrations, monitored using diffusion tubes, are within a similar range to the annual mean concentration monitored at Reading in 2001. It is therefore considered likely that future concentrations in West Berkshire would be similar to those predicted at the Reading site.

8.3

Emission Sources

8.3.1

Road Transport

Road traffic data has been provided by WBC and are detailed in Appendix A. Guidance specifies that narrow, congested streets, ‘busy’ junctions (>10,000 vehicles per day) and roads with a high percentage of HGVs are considered to be more significant in terms of potential exposure.

WBC has provided detailed mapping and this has been reviewed, in consultation with the Council, to identify potential areas of congestion, elevated exposure and bus routes. Within the Council’s Stage 2 assessment the A339, A4 and M4 were identified as a potentially significant

sources of NO2. The requirement to undertake a DMRB7

screening model or Detailed assessment, was

investigated using the road traffic information spreadsheet provided in support of the LAQM guidance and detailed in Appendix C. From a review of the detailed mapping and the potential

for exposure it was not necessary to undertake further assessment.

Bus Stations A designated coach station is located in Market Street, Newbury.

There are no sensitive

receptors within 10 metres of the station and further assessment is therefore not required.

8.3.2 Industrial

Defra guidance lists the significance of industrial sources, by process type, as a percentage of the total Part A emissions in 2000 and Part B process types that are considered likely to emit significant emissions.

7

Highways Agency. Design Manual for Roads and Bridges. 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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