appendix 6.4 additional local air quality methodology · additional local air quality methodology...

HIGHWAYS AGENCY – M4 JUNCTIONS 3 TO 12 SMART MOTORWAY

ENVIRONMENTAL STATEMENT APPENDICES ADDITIONAL LOCAL AIR QUALITY METHODOLOGY

MARCH 2015

APPENDIX 6.4 PAGE 1

APPENDIX 6.4 ADDITIONAL LOCAL AIR QUALITY METHODOLOGY

1. Detailed model inputs

1.1 Table A6.4.1 outlines the key model inputs utilised in the ADMS-Roads

modelling local air quality assessment.

Table A6.4.1 Model input parameters

Variables Model Input

Surface roughness at source 0.5 m

Minimum Monin-Obukhov length for stable conditions

30 m

Terrain types Flat

Receptor location x,y coordinates determined by GIS

z height of 1.5m for receptors.

Emissions NOX, PM10

Emission factors EFT V6.0.1 emission factor dataset

Meteorological data 1 year (2013) hourly sequential data from Heathrow

Airport Meteorology Station

Emission profiles Emissions have been calculated for AM, Inter Peak, PM

and Off Peak periods.

Receptors Selected receptors only

Model output Long-term annual mean NOX concentrations (µg/m3)

Long-term annual mean PM10 concentrations (µg/m3)

2. Meteorological data

2.1 Meteorological data from Heathrow Airport, for 2013 has been used in the

assessment. This meteorological site is located within the M4 air quality study

area. A wind rose for this site is presented in Figure A6.4.1 below.



MARCH 2015

APPENDIX 6.4 PAGE 2

Figure A6.4.1: Heathrow 2013 meteorological data

3. Traffic data

3.1 The traffic data for the links modelled in the local air quality assessment for

the baseline year and the opening year is available upon request from the

Agency.



MARCH 2015

APPENDIX 6.4 PAGE 3

4. Model post processing

4.1 To accompany the publication of the guidance document LAQM TG(09), a

NOx to NO2 converter was made available as a tool to calculate the road NO2

contribution from modelled road NOx contributions. The tool comes in the form

of an MS Excel spreadsheet and uses borough specific data to calculate

annual mean concentrations of NOx. This tool was used to calculate the total

NO2 concentrations at receptors from the modelled road NOx contribution and

associated background concentration. Due to the location of the proposed

development, the ‘All other urban UK traffic’ setting has been selected.

5. Model verification

5.1 The model predictions presented have been verified against monitoring data.

The verification factor used to adjust raw model outputs is presented in Table

A6.4.2. Across the study area, 9 zones were applied as certain areas

performed differently due to site specific variables.

Table 6.4.2 verification details

Description of area applied

Adjustment Factor Root Mean Square

Error (RMSE) Fractional Bias

A and B Roads adjacent to M4

2.55 5.8 0.0

Area between Junctions 6 and 7

of M4 3.64 1.4 0.0

Area around Bray Wick, south of M4

1.60 2.7 0.0

Area around A33/B3031

junction 5.28 N/A N/A

Area around Brookers Hill

5.09 5.4 0.0

Area around M3 Junctions 3 and 4

2.14 3.8 0.0

Chobham SSSI north of M3

2.72 2.3 0.0



MARCH 2015

APPENDIX 6.4 PAGE 4

Description of area applied

Adjustment Factor Root Mean Square

Error (RMSE) Fractional Bias

All other areas adjacent to M3

1.24 5.0 0.1

Rest of the study area

1.64 6.0 0.0

5.2 The above factors were applied to the predicted road NOX concentrations

prior to the conversion of road NOX to road NO2 and addition of NO2

background concentrations to provide predicted total NO2 concentrations at

the receptors.

5.3 The factors were also applied to the predicted road PM10 concentrations in the

absence of any monitoring data with which to calculate specific verification

factors for PM10.

5.4 Table 6.4.3 contains details of the all monitoring sites used within the

verification, including the verification zone for which they have been used to

calculate model adjustment factors. These are also displayed on drawings 6.1

to 6.35 (Document Reference 6.2 (ES Appendices)). Additional measurement

data collected in the area by local authorities etc. that was not used in the

assessment is also shown on those drawings for completeness. Reasons for

not including those measurement data in the assessment are based around

those locations not being considered representative of sensitive receptor

locations in the study area (e.g. located within a car park or too close to an

environmental barrier).



MARCH 2015

APPENDIX 6.4 PAGE 5

Table 6.4.3 Monitoring data used in the model verification

Site ID X Y Verification

Zone Year of

Monitoring

Monitored NO2

(µg/m3)

Monitoring Survey

Monitored Road NOx

(µg/m3)

Modelled Road NOx

(µg/m3)

003_URS 464528 171262 M4 A&B Roads 2013 30.2 URS 30.1 9.8

004_URS 465243 171710 M4 A&B Roads 2013 44.0 URS 67.5 24.3

015_URS 473233 169309 M4 A&B Roads 2013 33.1 URS 37.6 12.7

016_URS 518215 178331 M4 A&B Roads 2013 66.5 URS 109.1 51.9

035_URS 501471 177853 M4 A&B Roads 2013 49.2 URS 61.5 29.8

037_URS 500757 178292 M4 A&B Roads 2013 41.1 URS 43.4 13.7

044_URS 490991 178098 M4 A&B Roads 2013 32.1 URS 30.9 14.5

045_URS 490010 178715 M4 A&B Roads 2013 54.4 URS 92.3 25.6

059_URS 477883 170139 M4 A&B Roads 2013 47.2 URS 74.7 26.5

061_URS 477741 170002 M4 A&B Roads 2013 38.2 URS 49.8 20.6

063_URS 478531 170246 M4 A&B Roads 2013 39.2 URS 50.6 22.2

064_URS 478638 170199 M4 A&B Roads 2013 53.3 URS 90.9 38.2

066_URS 478924 170029 M4 A&B Roads 2013 34.7 URS 39.1 16.4



MARCH 2015

APPENDIX 6.4 PAGE 6


Zone Year of

Monitoring

Monitored NO2

(µg/m3)

Monitoring Survey

Monitored Road NOx

(µg/m3)

Modelled Road NOx

(µg/m3)

072_URS 500784 178298 M4 A&B Roads 2013 38.6 URS 37.2 8.2

077_URS 501262 178110 M4 A&B Roads 2013 43.0 URS 46.8 12.3

29_WBerks 464574 171294 M4 A&B Roads 2012 25.7 Local

Authority 20.2 8.9

30_Slough 501518 177882 M4 A&B Roads 2012 42.0 Local

Authority 42.4 14.8

31_Slough 501501 177879 M4 A&B Roads 2013 48.5 Local

Authority 60.4 15.9

Green Lane 478715 170063 M4 A&B Roads 2009 34.0 HA 37.5 19.1

HD91_Hillingdon 508771 178071 M4 A&B Roads 2010 39.5 Local

Authority 21.2 9.8


Authority 30.9 12.4


Authority 24.9 11.2

HS32_Hounslow 517592 178210 M4 A&B Roads 2013 64.3 Local

Authority 98.2 37.2



MARCH 2015

APPENDIX 6.4 PAGE 7


Zone Year of

Monitoring

Monitored NO2

(µg/m3)

Monitoring Survey

Monitored Road NOx

(µg/m3)

Modelled Road NOx

(µg/m3)


Authority 98.9 32.8


Authority 52.2 27.4

HSBRENA,B,C_Hounslow 517425 178071 M4 A&B Roads 2013 67.4 Local

Authority 109.2 44.2

MO 32 477869 170142 M4 A&B Roads 2009 42.7 HA 61.9 24.6

MO 43 490011 178714 M4 A&B Roads 2009 48.2 HA 73.3 23.9

MO 56 497171 179158 M4 A&B Roads 2009 44.1 HA 46.3 13.4

Reading Road 478776 170100 M4 A&B Roads 2009 38.7 HA 49.2 31.2

WM2_Windsor 489706 178789 M4 A&B Roads 2012 29.0 Local

Authority 23.0 7.0

WM29_Windsor 489975 178721 M4 A&B Roads 2012 60.1 Local

Authority 110.2 18.8

WM29a_Windsor 489928 178754 M4 A&B Roads 2012 46.9 Local

Authority 68.4 14.1

WM29b_Windsor 490012 178711 M4 A&B Roads 2012 39.4 Local

Authority 48.8 25.6



MARCH 2015

APPENDIX 6.4 PAGE 8


Zone Year of

Monitoring

Monitored NO2

(µg/m3)

Monitoring Survey

Monitored Road NOx

(µg/m3)

Modelled Road NOx

(µg/m3)

WOK503_Wokingham 474251 169683 M4 A&B Roads 2013 34.0 Local

Authority 40.3 10.2


Authority 32.7 18.9


Authority 36.0 18.5


Authority 52.4 13.2


Authority 48.8 14.7


Authority 35.3 13.2


Authority 56.1 19.8


Authority 99.3 34.6


Authority 30.4 18.9



MARCH 2015

APPENDIX 6.4 PAGE 9


Zone Year of

Monitoring

Monitored NO2

(µg/m3)

Monitoring Survey

Monitored Road NOx

(µg/m3)

Modelled Road NOx

(µg/m3)


Authority 32.7 18.9


Authority 38.7 14.3

040_URS 495664 179376 M4 J6-7 2013 44.1 URS 56.4 15.4

041_URS 494190 179905 M4 J6-7 2013 34.4 URS 34.2 9.5

079_URS 496126 179278 M4 J6-7 2013 46.9 URS 60.1 14.9

080_URS 493531 180216 M4 J6-7 2013 34.7 URS 32.9 7.8

20_Slough 496050 179258 M4 J6-7 2013 46.8 Local

Authority 59.6 16.8

26_Slough 496272 179187 M4 J6-7 2013 48.5 Local

Authority 64.6 18.1

MO 54 496117 179276 M4 J6-7 2009 42.7 HA 48.4 14.7

046_URS 490143 178597 M4 Bray Wick 2013 39.9 URS 50.1 32.7

MO 44 490079 178641 M4 Bray Wick 2009 56.8 HA 100.0 58.9

WM29c_Windsor 490108 178609 M4 Bray Wick 2012 32.4 Local

Authority 31.5 26.3



MARCH 2015

APPENDIX 6.4 PAGE 10


Zone Year of

Monitoring

Monitored NO2

(µg/m3)

Monitoring Survey

Monitored Road NOx

(µg/m3)

Modelled Road NOx

(µg/m3)

010_URS 471595 169068 A33/B3031 2013 38.3 URS 43.2 8.2

013_URS 472670 168651 Brookers Hill 2013 65.2 URS 193.6 36.1

MO 71 472748 168621 Brookers Hill 2009 42.4 HA 63.3 16.6

MO 12 492051 162691 M3 Junction 2009 49.3 HA 77.39 43.3

MO 13 492089 162633 M3 Junction 2009 34.3 HA 37.2 17.8

MO 14 491965 162780 M3 Junction 2009 40.3 HA 52.9 22.8

MO 79 486800 158320 M3 Junction 2009 43.5 HA 59.0 19.0

MO 80 487078 158506 M3 Junction 2009 35.7 HA 29.0 12.3

SH33_Surrey 486858 158322 M3 Junction 2013 44.6 Local

Authority 62.0 25.1

Eco1 (N) 497069 164847 M3 N Chobham 2009 69.2 HA 147.8 52.6

Eco2 (N15) 497060 164860 M3 N Chobham 2009 44.4 HA 65.8 28.1

Eco3 (N30) 497050 164874 M3 N Chobham 2009 40.5 HA 55.1 19.1

A1_Rushmoor 485118 157016 M3 General 2013 36.9 Local

Authority 44.5 33.3



MARCH 2015



Zone Year of

Monitoring

Monitored NO2

(µg/m3)

Monitoring Survey

Monitored Road NOx

(µg/m3)

Modelled Road NOx

(µg/m3)

Brackendale Close 488141 159205 M3 General 2009 34.0 HA 29.1 37.0

Burgoyne Road 489370 160543 M3 General 2009 29.5 HA 26.2 15.8

C1_Rushmoor 485047 156934 M3 General 2013 36.2 Local

Authority 41.4 21.1

D1_Rushmoor 485040 156906 M3 General 2013 34.0 Local

Authority 36.1 16.2

E1_Rushmoor 485042 156884 M3 General 2013 31.0 Local

Authority 29.1 13.1

Eco4 (S) 497084 164812 M3 General 2009 44.4 HA 65.8 78.7

Eco5 (S15) 497092 164799 M3 General 2009 41.7 HA 58.3 41.4

Eco6 (S30) 497101 164785 M3 General 2009 31.9 HA 33.7 28.1

G1_Rushmoor 485075 157080 M3 General 2013 28.8 Local

Authority 25.4 18.0

H1_Rushmoor 486435 157963 M3 General 2013 27.3 Local

Authority 16.9 22.6

J1_Rushmoor 485072 156949 M3 General 2013 30.0 Local

Authority 26.8 20.1



MARCH 2015



Zone Year of

Monitoring

Monitored NO2

(µg/m3)

Monitoring Survey

Monitored Road NOx

(µg/m3)

Modelled Road NOx

(µg/m3)

K1_Rushmoor 485056 156905 M3 General 2013 33.0 Local

Authority 33.7 14.4

MO 15 491251 162309 M3 General 2009 30.5 HA 28.9 11.8

MO 16 488423 159477 M3 General 2009 40.0 HA 43.8 31.5

MO 17 487982 159056 M3 General 2009 41.7 HA 49.4 33.6

MO 18 488001 159037 M3 General 2009 38.3 HA 39.4 20.7

MO 20 485916 157749 M3 General 2009 34.2 HA 37.8 15.0

MO 75 500563 167174 M3 General 2009 33.9 HA 30.9 27.9

O1_Rushmoor 485444 157374 M3 General 2013 23.9 Local

Authority 14.6 19.1

RY39_Runnymede 498827 166217 M3 General 2013 34.7 Local

Authority 38.5 19.1

SH14_Surrey 489250 160250 M3 General 2013 37.3 Local

Authority 44.7 28.7

SH15,22,25_Surrey 488634 159799 M3 General 2013 39.4 Local

Authority 42.4 22.8



MARCH 2015



Zone Year of

Monitoring

Monitored NO2

(µg/m3)

Monitoring Survey

Monitored Road NOx

(µg/m3)

Modelled Road NOx

(µg/m3)


Authority 43.4 31.5


Authority 26.7 20.2


Authority 29.7 24.3


Authority 31.6 37.4


Authority 33.2 17.1


Authority 40.8 21.6


Authority 28.5 23.7

006_URS 469157 169625 M4 General 2013 28.4 URS 26.6 10.8

008_URS 470041 169433 M4 General 2013 39.1 URS 53.0 20.3

012_URS 472666 168714 M4 General 2013 52.9 URS 94.7 70.5

017_URS 512991 177923 M4 General 2013 43.3 URS 36.7 29.3



MARCH 2015



Zone Year of

Monitoring

Monitored NO2

(µg/m3)

Monitoring Survey

Monitored Road NOx

(µg/m3)

Modelled Road NOx

(µg/m3)

018_URS 512957 178016 M4 General 2013 43.5 URS 34.7 10.3

021_URS 509721 178364 M4 General 2013 47.5 URS 40.2 17.1

022_URS 509500 178370 M4 General 2013 47.3 URS 39.6 22.5

029,30,31_URS 506951 178619 M4 General 2013 47.4 URS 41.9 18.5

032_URS 506226 178508 M4 General 2013 38.9 URS 20.3 17.7

033_URS 505926 178450 M4 General 2013 37.6 URS 17.5 21.2

034_URS 501753 178069 M4 General 2013 39.0 URS 36.5 32.1

039_URS 496416 179121 M4 General 2013 47.9 URS 62.7 22.8

042_URS 491676 179698 M4 General 2013 41.6 URS 51.0 60.5

043_URS 491641 179736 M4 General 2013 41.3 URS 50.3 32.8

047_URS 490001 178572 M4 General 2013 39.8 URS 50.0 22.4

050_URS 487906 179381 M4 General 2013 27.9 URS 16.3 18.4

051_URS 485988 176577 M4 General 2013 23.5 URS 16.4 11.5

058_URS 478164 170115 M4 General 2013 34.7 URS 39.2 22.1



MARCH 2015



Zone Year of

Monitoring

Monitored NO2

(µg/m3)

Monitoring Survey

Monitored Road NOx

(µg/m3)

Modelled Road NOx

(µg/m3)

060_URS 477812 170074 M4 General 2013 45.1 URS 68.5 50.9

062_URS 477417 170048 M4 General 2013 27.3 URS 23.9 21.0

065_URS 478754 170119 M4 General 2013 37.6 URS 46.3 48.9

067_URS 480200 170934 M4 General 2013 25.2 URS 19.3 8.2

068_URS 478610 171468 M4 General 2013 25.4 URS 17.3 9.6

069_URS 473958 169523 M4 General 2013 27.8 URS 25.3 9.6

070_URS 473869 169397 M4 General 2013 52.8 URS 92.0 34.1

071_URS 471375 168637 M4 General 2013 26.9 URS 27.2 16.8

073_URS 471414 168634 M4 General 2013 24.7 URS 22.4 20.5

075_URS 490200 178652 M4 General 2013 34.1 URS 35.7 26.3

078_URS 501649 177998 M4 General 2013 36.6 URS 28.6 18.2

081_URS 497489 179091 M4 General 2013 45.3 URS 49.6 23.7

11_Slough 501382 178101 M4 General 2013 48.1 Local

Authority 61.0 18.4



MARCH 2015



Zone Year of

Monitoring

Monitored NO2

(µg/m3)

Monitoring Survey

Monitored Road NOx

(µg/m3)

Modelled Road NOx

(µg/m3)


Authority 59.2 18.5


Authority 61.4 24.1


Authority 47.1 19.4


Authority 21.0 15.5

A_Wycombe 490784 190216 M4 General 2013 28.7 Local

Authority 21.1 20.0

HA Theale 2 469933 169434 M4 General 2009 50.5 HA 84.4 43.8

HA81_Hillingdon 509815 178355 M4 General 2010 51.0 Local

Authority 50.0 17.0

HA82_Hillingdon 509808 178326 M4 General 2010 47.5 Local

Authority 40.2 32.0

HD214_Hillingdon 509499 178370 M4 General 2013 44.1 Local

Authority 31.2 21.6

HD31a,b,c_Hillingdon 506951 178605 M4 General 2013 43.0 Local

Authority 30.3 22.0



MARCH 2015



Zone Year of

Monitoring

Monitored NO2

(µg/m3)

Monitoring Survey

Monitored Road NOx

(µg/m3)

Modelled Road NOx

(µg/m3)

HD99_Hillingdon 506225 178510 M4 General 2010 39.2 Local

Authority 20.9 16.5

MO 31 472401 168699 M4 General 2009 34.9 HA 43.7 16.1

MO 35 486027 176529 M4 General 2009 39.4 HA 53.1 28.5

MO 45 491644 179740 M4 General 2009 38.1 HA 41.9 27.2

MO 51 496443 179117 M4 General 2009 46.0 HA 57.4 21.3

MO 57 497489 179090 M4 General 2009 43.9 HA 45.9 23.0

MO 58 499518 177327 M4 General 2009 44.7 HA 55.6 30.9

MO 59 499524 177353 M4 General 2009 68.0 HA 130.4 58.3

MO 61 501789 178069 M4 General 2009 48.5 HA 62.1 28.3

MO 65 507064 178618 M4 General 2009 50.7 HA 51.6 20.0

MO 66 507042 178694 M4 General 2009 42.1 HA 28.5 10.2

MO 67 507173 178686 M4 General 2009 44.9 HA 35.8 12.1

MO 69 508805 178334 M4 General 2009 49.3 HA 46.7 24.2

P: Cranford Drive - 509815 178355 M4 General 2009 47.0 HA 38.9 17.6



MARCH 2015



Zone Year of

Monitoring

Monitored NO2

(µg/m3)

Monitoring Survey

Monitored Road NOx

(µg/m3)

Modelled Road NOx

(µg/m3)

Winvale 497429 179094 M4 General 2009 42.7 HA 42.6 27.8

WOK53_Wokingham 479771 171088 M4 General 2013 29.8 Local

Authority 25.1 15.1


Authority 20.6 8.8


Authority 34.4 31.9


Authority 27.1 11.4


Authority 33.2 18.4


Authority 30.8 22.8


Authority 37.7 31.1


Authority 60.9 15.9


Authority 24.1 12.8



MARCH 2015



Zone Year of

Monitoring

Monitored NO2

(µg/m3)

Monitoring Survey

Monitored Road NOx

(µg/m3)

Modelled Road NOx

(µg/m3)


Authority 37.2 25.0


Authority 33.4 31.1


Authority 36.9 24.6

appendix 6.4 additional local air quality methodology · additional local air quality methodology...

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