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2015 Air Quality Updating and Screening Assessment for Hart District Council In fulfillment of Part IV of the Environment Act 1995 Local Air Quality Management July 2015

Hart District Council

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Local Authority Officer Neil Hince

Department Environmental Health

Address Hart District Council,

Civic Offices,

Harlington Way

Fleet,

Hampshire, GU51 4AE

Telephone 01252 774421 ext 4280

e-mail [email protected]

Report

Reference number

ED61284001 – Issue 1

Date 1st July 2015


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Customer: Contact:

Hart District Council Andy Lewin Ricardo-AEA Gemini Building, Harwell, Didcot, OX11 0QR, United Kingdom

t: +44 (0) 1235 75 3189

e: [email protected]

Ricardo-AEA is certificated to ISO9001 and ISO14001

Confidentiality, copyright & reproduction:

This report is the Copyright of Hart District Council and has been prepared by Ricardo-AEA Ltd under contract to Hart District Council dated 01/07/2015. The contents of this report may not be reproduced in whole or in part, nor passed to any organisation or person without the specific prior written permission of Hart District Council. Ricardo-AEA accepts no liability whatsoever to any third party for any loss or damage arising from any interpretation or use of the information contained in this report, or reliance on any views expressed therein.

Author:

Andrew Lewin

Approved By:

Stephen Stratton

Date:

02 July 2015

Ricardo-AEA reference:

Ref: ED61284001- Issue 1

DRAFT Please keep until final version issued for audit purposes then delete this text


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Executive Summary

This Updating and Screening assessment fulfils the requirements of the Local Air Quality Management process as set out in Part IV of the Environment Act (1995), the Air Quality Strategy for England, Scotland, Wales and Northern Ireland 2007 and the relevant Policy and Technical Guidance documents. The LAQM process places an obligation on all local authorities to regularly review and assess air quality in their areas, and to determine whether or not the air quality objectives are likely to be achieved. Where exceedances are considered likely, the local authority must then declare an Air Quality Management Area (AQMA) and prepare an Air Quality Action Plan (AQAP) setting out the measures it intends to put in place in pursuit of the objectives. A review of new monitoring data has identified the following:

No annual mean NO2 concentration in excess of the 40 µg.m-3 objective was recorded at any of the Hart District Council diffusion tube sites during 2014.

Examination of the trends in measurements at the network of diffusion tubes over the last seven years indicates that NO2 concentrations have in general been decreasing at all sites.

The assessment of new sources has not identified any sources not previously assessed or any new locations where a detailed assessment is required. The Updating and Screening assessment has not identified any locations where a Detailed Assessment for any source or pollutant should be conducted. Hart District Council will continue monitoring at the existing NO2 diffusion tube sites within the District. The next air quality review and assessment report will be the 2016 Progress Report.


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Table of contents

1 Introduction ..................................................................................................................1

1.1 Description of Local Authority Area ................................................................................1

1.2 Purpose of Report ..........................................................................................................1

1.3 Air Quality Objectives.....................................................................................................1

1.4 Summary of Previous Review and Assessments ..............................................................3

2 New Monitoring Data ...................................................................................................4

2.1 Summary of Monitoring Undertaken ..............................................................................4

2.2 Comparison of Monitoring Results with AQ Objectives ................................................. 15

3 Road Traffic Sources ...................................................................................................19

3.1 Narrow Congested Streets with Residential Properties Close to the Kerb ..................... 19

3.2 Busy Streets Where People May Spend 1-hour or More Close to Traffic ....................... 19

3.3 Roads with a High Flow of Buses and/or HGVs. ............................................................ 19

3.4 Junctions ...................................................................................................................... 19

3.5 New Roads Constructed or Proposed Since the Last Round of Review and Assessment 19

3.6 Roads with Significantly Changed Traffic Flows............................................................. 20

3.7 Bus and Coach Stations ................................................................................................ 20

4 Other Transport Sources .............................................................................................21

4.1 Airports........................................................................................................................ 21

4.2 Railways (Diesel and Steam Trains) .............................................................................. 21

4.3 Ports (Shipping)............................................................................................................ 21

5 Industrial Sources .......................................................................................................22

5.1 Industrial Installations .................................................................................................. 22

5.2 Major Fuel (Petrol) Storage Depots .............................................................................. 22

5.3 Petrol Stations ............................................................................................................. 22

5.4 Poultry Farms ............................................................................................................... 22

6 Commercial and Domestic Sources .............................................................................23

6.1 Biomass Combustion – Individual Installations ............................................................. 23

6.2 Biomass Combustion – Combined Impacts ................................................................... 23

6.3 Domestic Solid-Fuel Burning ........................................................................................ 23

7 Fugitive or Uncontrolled Sources ................................................................................24

8 Conclusions and Proposed Actions .............................................................................25

8.1 Conclusions from New Monitoring Data ....................................................................... 25


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8.2 Conclusions from Assessment of Sources ..................................................................... 25

8.3 Proposed Actions ......................................................................................................... 25

9 Acknowledgements ....................................................................................................26

10 References ..................................................................................................................27

Tables

Table 1.1: Air Quality Objectives included in Regulations for the purpose of Local Air Quality

Management in England. ............................................................................................................2

Table 2.1: Details of Non- Automatic Monitoring Sites ........................................................................5

Table 2.2: 2014 Nitrogen Dioxide annual mean concentrations measured using diffusion tubes ....... 16

Table 2.3: Nitrogen Dioxide diffusion tubes annual mean concentrations (2008 to 2014) .................. 16

Figures

Figure 2.1: Diffusion tube locations – Blackwater ................................................................................6

Figure 2.2: Diffusion tube locations – Fleet .........................................................................................7

Figure 2.3: Diffusion tube locations – M3 ............................................................................................8

Figure 2.4: Diffusion tube locations – Hook .........................................................................................9

Figure 2.5: Diffusion tube locations – Odiham ................................................................................... 10

Figure 2.6: Diffusion tube locations – Phoenix ................................................................................... 11

Figure 2.7: Diffusion tube locations – South Warnborough................................................................ 12

Figure 2.8: Diffusion tube locations – Yately ...................................................................................... 13

Figure 2.9: Diffusion tube locations – Hazeley ................................................................................... 14

Figure 2.10: Trends in NO2 annual mean measured with diffusion tubes 2008 – 2014 ....................... 17

Appendices

Appendix A QA/QC Data

Appendix B DMRB Calculations


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1 Introduction

1.1 Description of Local Authority Area

Hart District lies in the north-east corner of Hampshire and is approximately 83 square miles in extent. The majority of land use within the District is rural, with a varied landscape made up of woodland, heathland common and arable land. The urban areas are concentrated in the north-east and east of the District around the towns of Yateley, Blackwater and Fleet. Hook is a recently expanded village on the western boundary. The other settlements within the district are villages, particularly notable for their historically and architecturally important buildings. There are 32 Conservation Areas and nearly 1,000 listed buildings in the District. From Hart’s northern boundary with Berkshire, the land rises to the North Downs in the south of the District. Three small rivers cross the area flowing northwards into the River Thames; one of which, the Blackwater, forms part of the boundary with Surrey and Berkshire. The Whitewater flows from the western side into the River Hart, from which the District takes its name.

1.2 Purpose of Report

This report fulfils the requirements of the Local Air Quality Management process as set out in Part IV of the Environment Act (1995), the Air Quality Strategy for England, Scotland, Wales and Northern Ireland 2007 and the relevant Policy and Technical Guidance documents. The LAQM process places an obligation on all local authorities to regularly review and assess air quality in their areas, and to determine whether or not the air quality objectives are likely to be achieved. Where exceedences are considered likely, the local authority must then declare an Air Quality Management Area (AQMA) and prepare an Air Quality Action Plan (AQAP) setting out the measures it intends to put in place in pursuit of the objectives. The objective of this Updating and Screening Assessment is to identify any matters that have changed which may lead to risk of an air quality objective being exceeded. A checklist approach and screening tools are used to identify significant new sources or changes and whether there is a need for a Detailed Assessment. The USA report should provide an update of any outstanding information requested previously in Review and Assessment reports.

1.3 Air Quality Objectives

The air quality objectives applicable to LAQM in England are set out in the Air Quality (England) Regulations 2000 (SI 928), The Air Quality (England) (Amendment) Regulations 2002 (SI 3043), and are shown in Table 1.1. This table shows the objectives in units of microgrammes per cubic metre µg.m-3 (milligrammes per cubic metre, mg.m-3 for carbon monoxide) with the number of exceedences in each year that are permitted (where applicable).


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Table 1.1: Air Quality Objectives included in Regulations for the purpose of Local Air Quality Management in England.

Pollutant

Air Quality Objective Date to be achieved by Concentration Measured as

Benzene 16.25 µg.m-3 Running annual mean 31.12.2003

3.25 µg.m-3 Running annual mean 31.12.2010

1,3-Butadiene 2.25 µg.m-3 Running annual mean 31.12.2003

Carbon monoxide 10.0 mg.m-3 Running 8-hour mean 31.12.2003

Lead 0.5 µg.m-3

0.25 µg.m-3

Annual mean

Annual mean

31.12.2004

31.12.2008

Nitrogen dioxide 200 µg.m-3 not to be exceeded more than 18 times a year

40 µg.m-3

1-hour mean

Annual mean

31.12.2005

31.12.2005

Particles (PM10) (gravimetric)

50 µg.m-3 , not to be exceeded more than 35 times a year

40 µg.m-3

24-hour mean

Annual mean

31.12.2004

31.12.2004

Sulphur dioxide 350 µg.m-3, not to be exceeded more than 24 times a year

125 µg.m-3, not to be exceeded more than 3 times a year

266 µg.m-3, not to be exceeded more than 35 times a year

1-hour mean

24-hour mean

15-minute mean

31.12.2004

31.12.2004

31.12.2005


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1.4 Summary of Previous Review and Assessments

Between 2003 and 2014 Hart District Council have completed four rounds of LAQM review and assessment and produced the associated annual reports. No requirement to proceed to a Detailed Assessment of air quality was identified during any of these rounds of review and assessment. A summary of the reports prepared during the latest round of the air quality review and assessment cycle (2012 to 2014) are as follows:

The 2012 Updating and Screening assessment concluded that NO2 and PM10 concentrations measured during 2011 were significantly below the respective annual mean objectives

The 2013 Progress Report concluded that updated monitoring data supported the conclusions of previous assessments of air quality in the District. The NO2 concentrations were significantly below the objectives in 2012 at all monitoring sites. PM10 was significantly below both the annual mean and short-term objectives; however measured PM10 concentrations have been increasing over recent years at the Blackwater automatic monitoring site.

The 2014 Progress Report also concluded that no pollutant concentrations in excess of the objectives were measured during 2014 and no further action was required.

No air quality management areas (AQMA) have been declared within Hart District to date.


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2 New Monitoring Data

2.1 Summary of Monitoring Undertaken

During 2014 Hart District Council measured NO2 and PM10 concentrations within the district at twelve diffusion tube sites.

2.1.1 Automatic Monitoring Sites

Continuous monitoring of NO2 and PM10 was previously conducted in Blackwater; monitoring at this site was discontinued in March 2014. Hart District Council no longer conduct any automatic monitoring within the district.

2.1.1 Non-Automatic Monitoring

Diffusion tube monitoring of NO2 was carried out at twelve sites within the Hart District Council area during 2014. Details of the diffusion tube monitoring locations are presented in Table 2.1. The locations include kerbside, roadside and background sites. Maps showing the locations of the diffusion tube monitoring sites are presented in Figures 2.1 to 2.9. A bias adjustment factor of 0.91 reported as the national average of co-location studies conducted using diffusion tubes prepared and analysed by Gradko during 2014 has been used to adjust the diffusion tube results. Full details of the diffusion tube QA/QC are presented in Appendix A.


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Table 2.1: Details of Non- Automatic Monitoring Sites

Site ID Site Name Site Type OS Grid Ref Pollutants Monitored

In AQMA?

Relevant Exposure?

Distance to kerb of

nearest road

Worst-case Location? X Y

OD1 Clover Leaf, Odiham Roadside 473651 151085 NO2 N Yes /50m 4m N

SW1 The Poachers, South Warnborough Kerbside 472277 147439 NO2 N Yes /15 4m N

FL2 Hart Leisure Centre, Fleet Roadside 479372 153862 NO2 N Yes /35m 8m N

HW2 The Phoenix, Hartley, Wintney Kerbside 475884 155818 NO2 N Yes/30m 2m Y

HO2 Dorchester Arms, Hook Kerbside 471382 153407 NO2 N Yes/16m 2m Y

M3EH Elvetham Heath Kerbside 480290 155899 NO2 N Yes/10m 15m (M3) Y

YA1 Yateley Comprehensive Background 481033 160500 NO2 N Yes/5m 6m Y

BH1 Bramshill Police College Background 474857 159047 NO2 N Yes/15m 1m N

M31 M3 Northbound Roadside 479920 156030 NO2 N Yes/100m 2m N

BL1 Vicarage Road, Blackwater Kerbside 485114 159809 NO2 N Yes/3m 3m Y

BL (AQM1) Blackwater (AQM – automatic site) Roadside 485251 159813 NO2 N Yes/22m 4m Y

HS1 High Street, Fleet Roadside 480592 153870 NO2 N Yes/22m 2m N


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Figure 2.1: Diffusion tube locations – Blackwater

Contains Ordnance Survey data © Crown copyright and database right 2015


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Figure 2.2: Diffusion tube locations – Fleet



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Figure 2.3: Diffusion tube locations – M3



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Figure 2.4: Diffusion tube locations – Hook



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Figure 2.5: Diffusion tube locations – Odiham



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Figure 2.6: Diffusion tube locations – Phoenix



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Figure 2.7: Diffusion tube locations – South Warnborough



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Figure 2.8: Diffusion tube locations – Yately



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Figure 2.9: Diffusion tube locations – Hazeley



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2.2 Comparison of Monitoring Results with AQ Objectives

2.2.1 Nitrogen Dioxide

Diffusion Tube Monitoring Data

Details of the annual mean NO2 concentrations measured using diffusion tube sites during 2014 are presented in Table 2.2 and the series of results measured from 2007 to 2011 are presented in Table 2.3. Data capture was generally good across the network of diffusion tubes during 2014, one short-term to long-term adjustment calculations was required for the tube at The Poachers, South Warnborough. Details of the adjustment factor calculated are presented in Appendix A. No annual mean NO2 concentrations in excess of the 40 µg.m-3 objective were recorded at the Hart District Council diffusion tube sites during 2014. A bar chart showing the trends in annual mean NO2 concentrations measured across the Hart District Council network of diffusion tubes over the last seven years is presented in Figure 2.10. Examination of the trend indicates that NO2 concentrations have in general been decreasing at all sites. The results should be considered in context with the bias adjustment factor applied as presented in Table 2.3.


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Table 2.2: 2014 Nitrogen Dioxide annual mean concentrations measured using diffusion tubes

Location Site Type Within AQMA?

Triplicate or Collocated Tube

Data Capture 2014 (%)

Data with less than 9 months has been annualised (Y/N)

Confirm if data has been distance

corrected (Y/N)

Annual mean concentration 2014

(µg.m-3) (Bias Adj. factor = 0.91)

Clover Leaf, Odiham Roadside N N 92% n/a N 17.9

The Poachers, South Warnborough Kerbside N N 67% n/a N 15.5*

Hart Leisure Centre, Fleet Roadside N N 92% n/a N 16.1

The Phoenix, Hartley, Wintney Kerbside N N 92% n/a N 33.6

Dorchester Arms, Hook Kerbside N N 92% n/a N 34.0

Elvetham Heath Kerbside N N 83% n/a N 22.9

Yateley Comprehensive Background N N 92% n/a N 14.2

Bramshill Police College Background N N 92% n/a N 10.4

M3 Northbound Roadside N N 92% n/a N 29.5

Vicarage Road, Blackwater Kerbside N N 92% n/a N 33.1

Blackwater (AQM – was automatic site) Roadside N Y (duplicate) 92% n/a N 30.8

High Street, Fleet Roadside N N 92% n/a N 27.7 * Estimated annual mean using short-term to long-term calculation as data capture < 75%

Table 2.3: Nitrogen Dioxide diffusion tubes annual mean concentrations (2008 to 2014)

Location Site Type Within AQMA?

Annual mean concentration (adjusted for bias) g.m-3

2008 (Bias Adjust. Factor = 0.90)

2009 (Bias Adjust Factor = 0.90)




2013 (Bias Adjust Factor =0.95)

2014 (Bias adjust factor = 0.91

Clover Leaf, Odiham Roadside N 24 22.5 24.4 19.8 23.7 22.7 17.9

The Poachers, South Warnborough Kerbside N 21.8 23.7 24 22.8 25.3 24.2 15.5

Hart Leisure Centre, Fleet Roadside N 19.4 17.6 20.8 16.1 17.9 18.1 16.1

The Phoenix, Hartley, Wintney Kerbside N 35.2 28.3 33.6 31.2 38.4 33.5 33.6

Dorchester Arms, Hook Kerbside N 36.2 33.4 37.4 31.1 32.2 34.7 34.0

Elvetham Heath Kerbside N 31.9 27.2 31.5 24.3 29.4 29.9 22.9

Yateley Comprehensive Background N 17.8 16.3 18.6 14.6 18.2 16.4 14.2

Bramshill Police College Background N 13.5 12.5 12.8 11.2 13.4 12.8 10.4

M3 Northbound Roadside N 31.9 30.2 30.6 29.6 30.9 28.3 29.5

Vicarage Road, Blackwater Kerbside N 37.9 33.7 35.4 31 35.7 36 33.1

Blackwater (AQM – was automatic site) Roadside N 35.3 34 36.8 27.7 33.3 33.9 30.8

High Street, Fleet Roadside N 31.7 28.8 34.3 28.3 30.3 31.9 27.7


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Figure 2.10: Trends in NO2 annual mean measured with diffusion tubes 2008 – 2014


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2.2.2 Sulphur Dioxide and other NAQS pollutants.

Hart District Council do not currently measure sulphur dioxide or any of the other NAQS pollutants.

2.2.3 Summary of Compliance with AQS Objectives

Hart District Council has examined the results from monitoring in the district. Concentrations are all below the objectives, therefore there is no need to proceed to a Detailed Assessment.


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3 Road Traffic Sources

3.1 Narrow Congested Streets with Residential Properties Close to the Kerb

Hart District Council confirms that there are no new/newly identified congested streets with a flow above 5,000 vehicles per day and residential properties close to the kerb, that have not been adequately considered in previous rounds of Review and Assessment.

3.2 Busy Streets Where People May Spend 1-hour or More Close to Traffic

A review of recently captured traffic count data identified no new locations where annual average daily traffic (AADT) flows were greater than 10,000; as specified in TG(09) as the criteria at which a screening assessment is required for busy streets where people may spend more than 1-hour close to traffic and there is relevant exposure within 5m of the kerb.

Hart District Council confirms that that there are no new/newly identified busy streets where people may spend 1 hour or more close to traffic.

3.3 Roads with a High Flow of Buses and/or HGVs.

A review of recently captured traffic count data has not identified any roads within Hart that have a high flow of buses/HDVs .

Hart District Council confirms that there are no new/newly identified roads with high flows of buses/HDVs.

3.4 Junctions

Hart District Council confirms that there are no new/newly identified busy junctions/busy roads.

3.5 New Roads Constructed or Proposed Since the Last Round of Review and Assessment

Hart District Council confirms that there are no new/proposed roads.


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3.6 Roads with Significantly Changed Traffic Flows

Hart District Council confirms that there are no new/newly identified roads with significantly changed traffic flows.

3.7 Bus and Coach Stations

Hart District Council confirms that there are no relevant bus stations in the Local Authority area.


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4 Other Transport Sources

4.1 Airports

Farnborough airport is located within the Rushmoor Borough Council area which is located close to the eastern boundary of Hart District. There is no relevant exposure within 1000 m of the airport that is located within the Hart District Council area. Blackbushe airport is located approximately 3 km west of Blackwater. The airport is used by light aircraft only for private aviation purposes; the passenger numbers and amount of freight processed at the airport does not fall within the screening criteria specified in the TG(09) guidance.

Hart District Council has assessed the airports close to, and within, the local authority area against the relevant screening criteria and confirms that there are no airports in the Local Authority area which require a detailed assessment.

4.2 Railways (Diesel and Steam Trains)

4.2.1 Stationary Trains

Hart District Council confirms that there are no locations where diesel or steam trains are regularly stationary for periods of 15 minutes or more, with potential for relevant exposure within 15 m.

4.2.2 Moving Trains

Hart District Council confirms that there are no locations with a large number of movements of diesel locomotives, and potential long-term relevant exposure within 30 m.

4.3 Ports (Shipping)

Hart District Council confirms that there are no ports or shipping that meet the specified criteria within the Local Authority area.


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5 Industrial Sources

5.1 Industrial Installations

5.1.1 New or Proposed Installations for which an Air Quality Assessment has been Carried Out

Hart District Council confirms that there are no new or proposed industrial installations for which planning approval has been granted within its area or nearby in a neighbouring authority.

5.1.2 Existing Installations where Emissions have Increased Substantially or New Relevant Exposure has been introduced

Hart District Council confirms that there are no industrial installations with substantially increased emissions or new relevant exposure in their vicinity within its area or nearby in a neighbouring authority.

5.1.3 New or Significantly Changed Installations with No Previous Air Quality Assessment

Hart District Council confirms that there are no new or proposed industrial installations for which planning approval has been granted within its area or nearby in a neighbouring authority.

5.2 Major Fuel (Petrol) Storage Depots

There are no major fuel (petrol) storage depots within the Local Authority area.

5.3 Petrol Stations

Hart District Council confirms that there are no petrol stations meeting the specified criteria.

5.4 Poultry Farms

Hart District Council confirms that there are no poultry farms meeting the specified criteria.


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6 Commercial and Domestic Sources

6.1 Biomass Combustion – Individual Installations

Hart District Council confirms that there are no biomass combustion plant in the Local Authority area.

6.2 Biomass Combustion – Combined Impacts

Hart District Council confirms that there are no biomass combustion plant in the Local Authority area.

6.3 Domestic Solid-Fuel Burning

Hart District Council confirms that there are no areas of significant domestic fuel use in the Local Authority area.


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7 Fugitive or Uncontrolled Sources

Hart District Council confirms that there are no potential sources of fugitive particulate matter emissions in the Local Authority area that require a detailed assessment.


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8 Conclusions and Proposed Actions

8.1 Conclusions from New Monitoring Data

No annual mean NO2 concentration in excess of the 40 µg.m-3 objective was recorded at any of the Hart District Council diffusion tube sites during 2014. Examination of the trends in measurements at the network of diffusion tubes over the last seven years indicates that NO2 concentrations have in general been decreasing at all sites.

8.2 Conclusions from Assessment of Sources

The assessment of new sources has not identified any sources not previously assessed or any new locations where a detailed assessment is required.

8.3 Proposed Actions

The Updating and Screening assessment has not identified any locations where a Detailed Assessment for any source or pollutant should be conducted. Hart District Council will continue monitoring at the existing diffusion tube sites within the District.


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9 Acknowledgements

Ricardo-AEA gratefully acknowledge the support received from Neil Hince of Hart District Council when completing this assessment.


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10 References

Department for Environment, Food and Rural Affairs, (2009) Local Air Quality Management Technical Guidance LAQM.TG (09). Department for Environment, Food and Rural Affairs, Air Quality Strategy for England, Scotland Wales and Northern Ireland, 2007. Spreadsheet of Diffusion Tube Bias Adjustment Factors accessed at http://laqm.defra.gov.uk/bias-adjustment-factors/national-bias.html Hart District Council (2014) Hart District Council LAQM Progress Report 2014

http://laqm.defra.gov.uk/bias-adjustment-factors/national-bias.html

http://laqm.defra.gov.uk/bias-adjustment-factors/national-bias.html


Date (July 2015) Updating and Screening Assessment

Appendices

Appendix A: QA/QC Data

Appendix B: DMRB Calculations



Appendix A: QA:QC Data

QA/QC of diffusion tube monitoring

Diffusion Tube Bias Adjustment Factors

The diffusion tubes deployed by Hart District Council are supplied and analysed by Gradko using a preparation mixture of 20% triethanolamine (TEA) in water. The bias adjustment factor of 0.91 reported in the national database of co-location studies, conducted using diffusion tubes prepared and analysed by Gradko during 2014, has been used to adjust the diffusion tube results. Gradko have participated in recent HSL WASP NO2 PT rounds and the percentage (%) of results submitted which were subsequently determined to be satisfactory during 2014 based upon a z-score of < ± 2 were as follows:

Jan – Mar 2014: 100%

Apr – Jun 2014: 100%

Jul – Sep 2014: 100%

Oct – Nov 2014: 100%

Diffusion tube precision

Diffusion tube precision was assessed during 2014 at the Blackwater site where duplicate tubes were sited. The calculated tube precision is presented in Figure A.1; all months were classified as having

good precision. Short-term to Long-term Data adjustment

A short to long term data adjustment was applied to annual mean NO2 measurements where the data capture was less than 75%. One adjustment ratio was calculated as presented in Tables A.1.

Table A.1: NO2 annual mean 2014 short-term to long-term adjustment – The Poachers, South Warnborough

Site Name Site Type Data capture Annual Mean (Am)

Period Mean (Pm)

Ratio (Am/Pm)

Reading New Town UB 98% 26.5 27.3 0.97

Southampton Centre UB 97% 31.6 32.9 0.96

Harwell RB 97% 8.0 8.7 0.92

Average ratio 0.951 UB – Urban background RB – Rural background



Figure A.1: Blackwater duplicate diffusion tubes assessment of precision 2014



Table A.2: NO2 monthly mean concentrations measured at diffusion tubes sites 2014

Site name Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Annual mean

(µg.m-3)

Data capture

Requires annualised?

Bias adjusted annual mean

(µg.m-3) (0.91 adj factor )

BLACKWATER (AQM 1) 28.7 33.1 40.0 31.2 31.3 30.3 38.0 31.5 - 24.7 41.4 40.8 33.7 92% N 30.7

BLACKWATER (AQM 2) 29.4 33.3 44.8 35.4 35.6 33.8 37.0 29.0 - 23.6 34.3 38.3 34.0 92% N 31.0

BRAMSHILL POLICE COLLEGE 11.6 12.2 18.3 9.7 8.4 8.1 9.4 8.1 - 9.5 18.2 12.2 11.4 92% N 10.4

VICARAGE ROAD,B''WATER 38.2 40.1 40.5 33.1 32.3 29.4 33.0 29.2 - 34.6 49.3 40.2 36.3 92% N 33.1

HART LEISURE CENTRE FLEET 18.7 17.0 26.3 17.4 18.3 13.7 14.5 15.4 - 13.7 22.1 17.5 17.7 92% N 16.1

DORCHESTER ARMS, HOOK 33.2 40.1 46.7 34.8 38.4 33.7 38.1 32.4 - 35.7 38.3 39.7 37.4 92% N 34.0

HIGH STREET, FLEET 27.2 27.5 40.1 29.7 27.8 26.4 30.3 21.2 - 38.8 36.1 29.9 30.4 92% N 27.7

THE PHOENIX, H WINTNEY 31.8 45.7 44.8 34.0 38.1 34.5 40.1 34.9 - 22.7 41.6 38.4 37.0 92% N 33.6

M3 NORTHBOUND 34.8 38.0 39.5 28.8 30.8 29.6 26.6 26.8 - 39.4 36.1 26.4 32.4 92% N 29.5

ELVETHAM HEATH, FLEET 23.1 22.9 - 26.5 26.2 23.9 31.3 25.1 - 17.0 28.7 27.0 25.2 83% N 22.9

CLOVER LEAF, ODIHAM 20.0 17.6 30.4 19.3 17.1 17.3 17.0 13.6 - 15.5 31.1 17.7 19.7 92% N 17.9

THE POACHER, S WARNB 27.2 29.9 - - 12.2 12.5 13.1 - 13.3 18.3 17.0 17.9 67% Y 15.5

YATELEY COMPREHENSIVE 17.3 16.9 22.9 14.7 12.1 11.9 11.1 11.3 - 11.9 25.3 16.6 15.6 92% N 14.2

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