3.7km south of the cable route. The proposed site access routes pass through the Norwich Road/Valley Road AQMA, along the A1156 and A1214.
20.5.2 Air Quality Monitoring 61. NO2 diffusion tube monitoring is undertaken by IBC across the borough. There is one diffusion tube, tube 16, located on Valley Road which is within an AQMA and is along one of the site access routes. Recent monitoring results from tube 16 are detailed in Table 20.17.
Table 20.17 Relevant NO2 diffusion tube results from IBC Location
Tube ID
16 62. Valley Road/Norwich Road X Y
Monitored NO2 Concentration (µg.m-3) 2008
615361 245436 37.0
2009 40.0
2010 41.9
2011 38.7
2012 35.2
As shown in Table 20.17, NO2 concentrations exceeded the annual mean Objective of 40µg.m-3 in 2009 and 2010. This is consistent with the AQMA designation, although more recent measurements indicate concentrations below the Objective.
20.5.3 Background Concentrations 63.
Background concentrations of NOx, NO2 and PM10were obtained from the air pollutant concentration maps provided by Defra for the grid squares covering the onshore electrical transmission works and sensitive receptor locations. The background concentrations for 2012 for identified sensitive receptor locations are detailed in Table 20.18.
Table 20.18 Background Pollutant Concentrations (µg.m-3) Obtained for 1kmx 1km Grid Squares Covering Sensitive Receptor Locations
Grid Square
610500,254500 612500,240500 612500,248500 612500,251500 613500,241500 613500,246500 613500,249500 615500,245500 619500,240500 621500,253500 622500,250500 622500,251500 623500,250500 624500,244500 624500,246500
Preliminary Environmental Information May 2014
Receptors
R28 R17 R19 R2 R4
R18
R3, R29 R1, R20 R16
R8, R27 R22
R21, R23 R24 R13 R12
2012 Mapped Background Concentration (µg.m-3) NOx
NO2
30.49 23.50 23.60 26.91 29.67 29.19 25.57 32.31 36.30 16.30 17.28 16.72 17.01 25.27 25.13
18.75 15.14 15.15 16.81 18.50 18.23 16.29 19.76 21.56 10.80 11.38 11.05 11.22 16.08 16.03
East Anglia THREE Offshore Windfarm
PM10 20.07
17.74 17.16 18.68 19.09 17.81 19.05 16.59 17.60 17.01 15.54 15.41 16.06 17.05 15.98
Chapter 20 Air Quality Page 23
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