Hyde Primary School Air Quality Assessment Report 27 Aug 2014plandocs.tameside.gov.uk/anitepublicdocs/00208685.pdf · Hyde Primary School Air Quality Assessment 27 August 2014 Executive

Hyde Primary School Air

Quality Assessment

27 August 2014

Hyde Primary School AirQuality Assessment27 August 2014 Contents

i

Quality Management

Job No

Project Hyde Primary School Air Quality Assessment

Location Porlock Avenue, Hyde

Title Hyde Primary School Air Quality Assessment

Document Ref Issue / Revision 01

File reference C:\Users\hannah.carruthers\Desktop\Hyde Primary School Air Quality Assessment

Report 27 Aug 2014.docx

Date 27 August 2014

Prepared by 1 Daniel Moon Signature (for file)

Checked by Jayne Garbutt Signature (for file)

Authorised by Signature (for file)

Hyde Primary School AirQuality Assessment27 August 2014 Contents

ii

Contents

Executive Summary 1

Introduction 2

Methodology and Criteria 3

Baseline Conditions 9

Predicted Air Quality 12

Conclusions 16

Appendix A - Legislation & Policy 17

Appendix B - Detailed Assessment Methodology 20

Hyde Primary School AirQuality Assessment27 August 2014

Executive Summary

1

1. Executive SummaryCapita Ltd has been commissioned by Carillion to produce an Air Quality Assessment

in support of their planning application for a proposed development at Porlock Avenue,

Hyde.

The proposed development consists of a new nursery, pre-school and primary school

close to the site of the former 800 pupil Alder Community High School. The proposed

development also includes a hall, sick bay, plant and server rooms and internal

corridor area. Separate vehicular and pedestrian accesses will be provided along with

a 48 space car park.

Due to the location of the proposed development it is expected that the proposed

development will increase vehicle movements on the local road network which may

have a significant effect to local air quality. The site is also located adjacent to an Air

Quality Management Area (AQMA); an area designated with poor air quality and may

experience elevated background levels of air pollution.

Concentrations of NO2 and PM10 have been predicted at existing sensitive receptors

using the DMRB screening model.

It is predicted that annual mean concentrations of NO2 and PM10 and 24-hour PM10

concentrations do not exceed the annual mean NO2 and PM10 NAQOs across the

study area for all assessment scenarios.

The impact of the proposed development to local air quality during operation due to

increased traffic movements on the local road network was shown to be small

according to EPUK and IAQM assessment criteria. This is not considered significant.

There have not been any identified constraints in regards to air quality to the proposed

development in this assessment and therefore air quality should not be a material

consideration to this application.


Introduction

2

2. IntroductionCapita Ltd has been commissioned by Carillion to produce an air quality assessment

in support of their planning application for a proposed development at Porlock Avenue,

Hyde.

The proposed development consists of a new nursery, pre-school and primary school

close to the site of the former 800 pupil Alder Community High School. The proposed

development also includes a hall, sick bay, plant and server rooms and internal

corridor area. Separate vehicular and pedestrian accesses will be provided along with

a 48 space car park.

Due to the location of the proposed development it is expected that the proposed

development will increase vehicle movements on the local road network which may

have a significant effect to local air quality. The site is also located adjacent to an Air

Quality Management Area (AQMA); an area designated with poor air quality and may

therefore experience elevated background levels of air pollution. To address possible

concerns, Tameside Metropolitan Borough Council (TMBC) has requested that an air

quality assessment is carried out to support the planning application.

It was agreed that the methodology of the assessment required would reflect the

impact of the proposed development to vehicle movements on the local road network.

If the proposed development is expected to exceed the assessment criteria published

by Environmental Protection UK1

(EPUK, i.e. increase of 10% or 5% to the Annual

Average Daily Traffic, AADT, on road outside or inside and AQMA respectively) then a

detailed dispersion model will be used to predict pollutant concentrations as identified

receptor locations. If the proposed development does not exceed EPUK assessment

criteria the Design Manual for Roads and Bridges (DMRB) screening methodology will

be used to predict pollutant concentrations at identified receptor locations. The

assessment focuses on concentrations of nitrogen dioxide (NO2) and inhalable

particulate matter (PM10) as these are the pollutants most associated with emissions

from road traffic and are of most concern in the local area.

1EPUK (2010), Development Control: Planning for Air Quality (2010 Update)


Methodology and Criteria

3

3. Methodology and Criteria

3.1 Consultation

TMBC’s Planning Officer, Jason Dugdale, was consulted and the scope and

methodology of the air quality assessment agreed.

3.2 Legislation and Policy

Air quality is governed by a series of local, regional and national legislation and

policies. A detailed review of relevant legislation and policies is presented in Appendix

A.

With regards to the potential effect of the proposed development, the key legislation

are the National Air Quality Objectives (NAQOs), as set out in the Air Quality

(England) Regulations 2000 and the Air Quality (England) (Amendment) Regulations

2002. The NAQOs include targets for NO2 and PM10 concentrations, as presented in

Table 1.

Table 1 – NO2 and PM10 National Air Quality Objectives (NAQO)

Pollutant Objective Pollutant Objective

Nitrogen dioxide (NO2) 200μg/m3

measured as a 1-hour mean , not to

be exceed more than 18 times a year (99.79th

percentile)

40μg/m3

measured as an annual mean

Particles (PM10)

(gravimetric)

50μg/m3

measured as a 24-hour mean, not to

be exceeded more than 35 times a year

40μg/m3

measured as an annual mean

Source: Air Quality (England) Regulations, 2000

These air quality objectives are aimed at the protection of human health. The annual

mean NAQOs apply at locations where the public may be regularly exposed, such as

building facades of residential properties, schools, hospitals and care homes. The 1-

hour mean NAQOs apply at all locations where it is reasonable to expect members of

the public to spend at least this period of time, for example busy shopping streets, car

parks, bus stations, railway stations, school playgrounds, etc. The 24-hour mean PM10

NAQO applies at all locations where the annual mean objective would apply, together



4

with hotels and gardens of residential properties where relevant public exposure is

likely.

Although the objectives apply at potential inlets to indoor spaces, they do not directly

apply to occupational, indoor or in-vehicle exposure.

3.3 Assessment Methodology

In response to the above key policies, a DMRB screening assessment has been

carried out to assess the potential exposure of road traffic emissions on existing and

future receptors to concentrations of NO2 and PM10 for three assessment scenarios;

baseline (2013), first year of operation “do nothing” (2015) and first year of operation

“do something” (2015) scenarios. Predicted impact of the proposed development to

vehicle movements on the local road network are presented in Appendix B. The

increase of traffic movements on the local road network does not exceed the EPUK2

criteria for which a detailed dispersion modelling assessment is recommended and

therefore a DMRB screening assessment has been conducted.

Baseline concentrations of NO2 and PM10 are derived from TMBC’s LAQM report,

historic data from automatic monitoring and the Department for Environment, Food

and Rural Affairs (Defra) modelled background air quality for the area. None of the

passive monitoring of NO2 concentrations undertaken by TMBC is applicable to the

site.

The potential impact and exposure to air quality from traffic emissions experience at

existing and future receptors is assessed using the DMRB (v1.03c) screening model3.

This model is widely used in the UK for this type of assessment. It applies specified

emission parameters for road traffic sources to predict resulting concentrations of NO2

and PM10 at key receptors under the different assessment scenarios.

LAQM.TG(09) recommends using a combination of automatic and diffusion tube

monitoring data to verify predictions of NO2 and PM10 concentrations. Unfortunately

there are no monitoring locations within the study area. Therefore, stringent

verification factors, based on the experience of air quality consultants at Capita, of 5

and 10 have been applied to predicted contributions from road traffic emissions to


3http://www.dft.gov.uk/ha/standards/guidance/air-quality.htm



5

ambient concentrations of oxides of nitrogen (NOx = NO + NO2) and PM10

respectively.

The study area for the assessment incorporates Porlock Avenue and Hattersley Road.

Assessment points are all located adjacent to these roads and are placed at the road

facing facades of identified existing sensitive receptors that are expected to

experience the greatest impact to air quality due to road traffic emissions associated

with the development.

3.4 Assessment Criteria

The predicted NO2 and PM10 concentrations from the dispersion model are assessed

against the above NAQOs.

The predicted annual average concentrations for NO2 were used to screen whether

the 1-hour NO2 NAQO is likely to be breached where traffic emissions are the

significant source. Data from a large number of monitoring sites, where road transport

is the predominant emission source, shows that the short term objective is generally

not exceeded when the annual average concentrations of NO2 is less than 60μg/m3.4

The predicted number of days when the PM10 concentration exceeds 50μg/m3

has

been calculated from the annual average concentration using the methodology in

LAQM.TG(09).

The magnitude of impacts on annual mean concentrations of NO2 and PM10 of the

development has been defined in the Institute of Air Quality Management (IAQM)

guidance issued in 20095. These definitions have been adopted by EPUK

6and applied

to the results of this assessment.

Table 2 presents the IAQM’s definition of impact magnitude as a percentage of the

relevant annual mean NAQOs and number of days mean PM10 concentrations are

greater than 50μg/m3.

4Defra (2009), LAQM.TG(09)

5IAQM (2009), Significance in Air Quality




6

Table 2 – IAQM’s Definition of Impact Magnitude for Changes in Annual Mean

NO2 and PM10 Concentrations as a Percentage of the Relevant NAQO and

Number of Days Mean PM10 Concentrations are Greater than 50μg/m3

Magnitude Annual Mean

Criteria

Number of days above

50μg/m3

Large >10% of relevant

NAQO

>4 days

Medium 5 – 10% of relevant

NAQO

2-4 days

Small 1 – 5% of relevant

NAQO

1-2 days

Imperceptible <1% of relevant

NAQO

<1 day

Source: EPUK

Table 3 and Table 4 presents the IAQM’s impact descriptors to describe the

significance of changes in annual average NO2 and PM10 concentrations and number

of days mean PM10 concentration exceed 50μg/m3

due to a scheme at considered

receptors respectively. It should be noted that there is no criteria to describe the

significance of changes in the number of hours mean NO2 concentrations exceed

200μg/m3

and the guidance states that this magnitude and significance criteria should

not be used to evaluate the overall air quality impact of a scheme but should be used

to inform it. Substantial and moderate adverse/beneficial air quality impact descriptors

are considered significant.



7

Table 3 – IAQM’s Air Quality Impact Descriptors for Changes to Annual Mean NO2 and

PM10 Concentrations at Sensitive Receptors

Absolute Concentration in

Relation with NAQO

Magnitude of Impact

Small Medium Large

Increase with the Scheme

Above NAQO With Scheme

([NO2][PM10] >40μg/m3)

Slight Adverse Moderate Adverse Substantial

Adverse

Just Below NAQO With Scheme

([NO2][PM10] = 36–40μg/m3)

Slight Adverse Moderate Adverse Moderate Adverse

Below NAQO With Scheme

([NO2]

[PM10] = 30–36μg/m3)

Negligible Slight Adverse Slight Adverse

Well Below NAQO With Scheme

([NO2][PM10] <30μg/m3)

Negligible Negligible Slight Adverse

Decrease With Scheme

Above NAQO Without Scheme

([NO2][PM10] >40μg/m3)

Slight

Beneficial

Moderate Beneficial Substantial

Beneficial

Just Below NAQO Without

Scheme ([NO2][PM10] = 36–

40μg/m3)

Slight

Beneficial

Moderate Beneficial Moderate

Beneficial

Below NAQO Without Scheme

([NO2][PM10] = 30–36μg/m3)

Negligible Slight Beneficial Slight Beneficial

Well Below NAQO Without

Scheme ([NO2][PM10] <30μg/m3)

Negligible Negligible Slight Beneficial

Source: EPUK NB: All imperceptible changes are considered negligible



8

Table 4 – IAQM’s Air Quality Impact Descriptors for Changes to Number of Day’s Mean

PM10 Concentrations exceed 50μg/m3

at Sensitive Receptors

Absolute Concentration in

Relation with NAQO

Magnitude of Impact

Small Medium Large

Increase with the Scheme

Above NAQO With Scheme (>35

days)

Slight Adverse Moderate Adverse Substantial

Adverse

Just Below NAQO With Scheme

(32-35 days)

Slight Adverse Moderate Adverse Moderate Adverse

Below NAQO With Scheme

([NO2]

[PM10] = 30–36μg/m3)

Negligible Slight Adverse Slight Adverse

Well Below NAQO With Scheme

([NO2][PM10] <30μg/m3)

Negligible Negligible Slight Adverse

Decrease With Scheme

Above NAQO Without Scheme

([NO2][PM10] >40μg/m3)

Slight

Beneficial

Moderate Beneficial Substantial

Beneficial

Just Below NAQO Without

Scheme ([NO2][PM10] = 36–

40μg/m3)

Slight

Beneficial

Moderate Beneficial Moderate

Beneficial

Below NAQO Without Scheme

([NO2][PM10] = 30–36μg/m3)

Negligible Slight Beneficial Slight Beneficial

Well Below NAQO Without

Scheme ([NO2][PM10] <30μg/m3)

Negligible Negligible Slight Beneficial

Source: EPUK NB: All imperceptible changes are considered negligible


Baseline Conditions

9

4. Baseline Conditions

4.1 LAQM

TMBC’s LAQM reports are combined with other boroughs within the Greater

Manchester area. They provide information regarding historical air quality within the

borough and suggest that exceedences of the annual mean NO2 NAQO’s are located

along a network of main roads within the borough. Subsequently TMBC declared this

area an AQMA. Figure 1 presents a map of the AQMA (green area).

Figure 1 – TMBC AQMA

Source: http://uk-air.defra.gov.uk/aqma/details?aqma_id=293

4.2 Automatic Monitoring

There is currently one automatic monitoring station within TMBC; Tameside Two

Trees School. The automatic monitoring station is broadly representative of local air

quality at the site due to its similar proximity to the M67. Two Trees School monitoring


Baseline Conditions

10

station is classified as an urban background site and is located approximately 3.5km

west of the site. The Two Tree School monitoring site is unsuitable for verification

purposes as it is located outside the study area. It is useful to this assessment to

analyse data from this monitoring site in order to establish trends in background

concentrations of pollutants within the Tameside region. Table 5 presents NO2 and

PM10 concentrations measured at Two Tress School Monitoring station from 2009 -

2011.

Table 5 – Measured NO2 and PM10 Concentrations at Two Trees School

Automatic Monitoring Station 2009 – 2011

NAQO 2009 2010 2011

[NO2] Annual Mean (μg/m3) 19 24 21

No. of hourly Mean [NO2] >200μg/m3

0 0 0

[PM10] Annual Mean (μg/m3) 16 17 17

No. of 24-hr Mean [PM10] >50μg/m3

1 0 2

Source: 2012 Air Quality Updating and Screening Assessment for Greater Manchester

Monitoring data from Two Trees School monitoring station shows that concentrations

of NO2 and PM10 do not exceed the relevant NAQOs across background areas across

Tameside. Concentrations of NO2 and PM10 are described by EPUK guidance as

being well below the NAQO. Annual mean NO2 concentrations at the monitoring

station show a slight upwards trend while annual mean PM10 concentrations remain

static.

4.3 Defra Background Maps

Defra provides modelled background concentrations for each 1 x 1 km grid across all

local authority areas from a base year of 20117. This data can be projected up to

2030. Table 6 presents the estimated background concentrations at the study area

(Grid Location: 397500, 394500) for the Baseline year (2013) and first year of

operation (2015).

7http://uk-air.defra.gov.uk/data/laqm-background-home


Baseline Conditions

11

Table 6 – Defra Modelled Background Annual Mean NOx, NO2 and PM10

Concentrations

Year NOx (μg/m3) NO2 (μg/m

3) PM10 (μg/m

3)

2013 32.5 22.3 15.3

2015 30.7 21.3 14.8

Defra background maps show good agreement with monitoring data from the Two

Trees School monitoring station. These concentrations will be added to the

contribution from traffic emissions within the study area calculated using the DMRB

methodology.

4.4 Summary of Existing Air Quality

Monitoring data representative of the site shows that it is likely that the NO2 and PM10

NAQOs will be achieved across the site. Annual mean NO2 and PM10 concentrations

show either a slight upwards trend or have remained static since 2009, therefore any

decrease of traffic emissions predicted by Defra due to vehicle technology

improvements should be treated with caution. Defra modelled background maps show

good agreement with background monitoring data and have therefore been used to

determine the background concentrations used within this assessment.


Predicted Air Quality

12

5. Predicted Air Quality

5.1 NO2 Concentrations

Table 7 presents the predicted annual mean NO2 concentrations at the closest

facades of considered receptors to the roads within the study area for the baseline

(2013) and future (2015) assessment scenarios.

Table 7 – Predicted NO2 Concentrations at Considered Sensitive Receptors,

2013 and 2015

Receptor Annual Mean NO2 Concentrations

Baseline 2013 Future Baseline

2015

Future with

Development

(2015)

Porlock Avenue

(1)

24.8 23.6 24.1

Hattersley Rd

North 1 (2)

28.7 27.2 28.4

Hattersley Rd

North 2 (3)

29.8 28.1 29.5

Hattersley Rd

South 1 (4)

28.9 27.3 28.3

Hattersley Rd

South 2 (5)

29.9 28.3 29.4

Predicted baseline (2013), future baseline (2015) and with development (2015) annual

mean NO2 concentrations do not exceed the relevant NAQO at any considered

receptors.

Predicted annual mean NO2 concentrations for all assessment scenarios do not

exceed 60μg/m3at any considered receptors suggesting the 1-hour NO2 NAQO will be

achieved.

Annual mean NO2 concentrations across the study area are predicted to fall from 2013

to 2015 as it is anticipated that measures within the Air Quality Strategy (Defra, 2007)

and improvements in vehicle technology should deliver a reduction in NOx emissions.



13

5.2 Annual Mean PM10 Concentrations

Table 8 presents the predicted annual mean PM10 concentrations at the closest

facades of considered receptors to the roads within the study area for the baseline

(2013) and future (2015) assessment scenarios.

Table 8 – Predicted PM10 Concentrations at Considered Sensitive Receptors,

2013 and 2015

Receptor Annual Mean PM10 Concentrations


2015

Future with

Development

(2015)

(1) 16.2 15.6 15.8

(2) 17.5 16.8 17.2

(3) 17.9 17.1 17.6

(4) 17.6 16.9 17.2

(5) 18.0 17.2 17.5

Predicted baseline (2013), future baseline (2015) and with development (2015) annual

mean PM10 concentrations do not exceed the relevant NAQO at any considered

receptors.

Annual mean PM10 concentrations across the study area are predicted to fall from

2013 to 2015 as it is anticipated that measures within the Air Quality Strategy (Defra,

2007) and improvements in vehicle technology should deliver a reduction in PM10

emissions.

5.3 24-Hour PM10 Concentrations

Table 9 presents the number of days mean PM10 concentrations exceed 50μg/m3

at

the closest facades of considered receptors to the roads within the study area for the

baseline (2013) and future (2015) assessment scenarios.



14

Table 9 – Predicted PM10 Concentrations for Existing and Proposed Site

Conditions, 2013 and 2015

Receptor No. of Days Mean PM10 Concentrations >50μg/m3


2015

Future with

Development

(2015)

(1) 0 0 1

(2) 1 1 1

(3) 1 1 1

(4) 1 1 1

(5) 1 1 1

Predicted baseline (2013), future baseline (2015) and with development (2015) 24-

hour mean PM10 concentrations do not exceed the relevant NAQO at any considered

receptors.

24-hour mean PM10 concentrations across the study area are predicted to fall from

2013 to 2015 as it is anticipated that measures within the Air Quality Strategy (Defra,

2007) and improvements in vehicle technology should deliver a reduction in PM10

emissions.

5.4 Significance of Effect

Table 10 presents the magnitude and significance of predicted impacts to 2015 annual

mean NO2 and PM10 concentrations from additional traffic emissions associated with

the proposed development.



15

Table 10 – Significance of Impacts to Local Air Quality

Receptor 2015

NO2 PM10

Impact

(μg/m3)

%

NAQO

Mag.

of

Impact

Sig. of

Impact

Impact

(μg/m3)

%

NAQO

Mag. of

Impact

Sig. of

Impact

1 0.5 1.2 Small Negligible 0.2 <1.0 Imperceptible Negligible

2 1.2 3.0 Small Negligible 0.4 1.0 Small Negligible


4 0.9 2.4 Small Negligible 0.3 <1.0 Imperceptible Negligible


The predicted impact of traffic emissions associated with the proposed development to

annual mean NO2 and PM10 concentrations at most of considered receptors is

described by EPUK as small. Based on the total annual mean NO2 and PM10

concentrations reported in Section 5.1 and 5.2 respectively the significance of the

effect of traffic emissions to air quality at considered receptors is predicted to be

negligible during the anticipated first year of operation (2015).

The predicted change in the number of days where the mean PM10 concentration

exceeds 50μg/m3

during the first year of operation is less than one day at all

considered receptors. This is considered to be an imperceptible change and not

significant.

Effects from additional traffic movements associated with the operation of the

proposed development to local air quality are not considered significant and therefore

mitigation is not required.


Conclusions

16

6. ConclusionsConcentrations of NO2 and PM10 have been predicted at existing sensitive receptors

using the DMRB screening model.

It is predicted that annual mean concentrations of NO2 and PM10 and 24-hour PM10

concentrations do not exceed the annual mean NO2 and PM10 NAQOs across the

study area for all assessment scenarios. Due to expected improvements in vehicle

technology and background NO2 concentrations, NO2 and PM10 concentrations should

decrease further in the future.

The impact of the proposed development to local air quality during operation due to

increased traffic movements on the local road network was shown to be small

according to EPUK and IAQM assessment criteria. This is not considered significant.

In conclusion, there have not been any identified constraints with regard to air quality

in relation to the proposed development and therefore air quality should not be a

material consideration to this application.


Appendix A - Legislation & Policy

17

7. Appendix A - Legislation & Policy

7.1 Air Quality Strategy

Part IV of the Environment Act 1995 introduced a system of Local Air Quality Management

(LAQM). This requires Local Authorities to regularly and systematically review and assess air

quality within their boundaries against a series of objectives, and appraise development and

transport plans against these assessments.

The Air Quality Strategy (2007) establishes the policy for ambient air quality for the UK. Its

primary objective is to ensure that everyone can enjoy a level of ambient air quality in public

places that poses no significant risk to health or quality of life, and to protect the environment.

The Strategy sets out the National Air Quality Objectives (NAQOs). Those included in LAQM

are prescribed in the Air Quality (England) Regulations 2000 and the Air Quality (England)

(Amendment) Regulations 2002.

The air quality objectives for the protection of human health apply to outdoor locations where

people are regularly present, and where they might reasonably be expected to be exposed over

the relevant averaging times (which vary from 15 minutes to a year). The air quality objectives

do not apply to occupational, indoor or in-vehicle exposure.

Where a NAQO is unlikely to be met, the local authority must designate an Air Quality

Management Area (AQMA) and draw up an Air Quality Action Plan (AQAP) setting out the

measures it intends to introduce in pursuit of the objectives within its AQMA. Land use and

transport planning are major components of effective AQAPs.

Local authorities’ approach to establishing an AQMA may differ. Some declare the whole

district/borough an AQMA, others have declared AQMAs at specific areas where NAQOs have

been shown or predicted to be exceeded. The latter approach can lead to the declaration of

multiple AQMAs so some authorities have declared a whole area, around exceedences of the

relevant NAQO, an AQMA. Over 230 local authorities have declared AQMAs. TMBC has

declared the areas along main road networks as an AQMA due to widespread exceedances of

the NO2 NAQO. TMBC has its own AQAP and also forms part of a wider strategy to manage air

quality within the Manchester region; GreatAir Manchester.



18

7.2 Air Quality Standards Regulations

The Air Quality (Standards) Regulations 2010 transpose into English law the requirements of

European Directives 2008/50/EC and 2004/107/EC on ambient air quality. They include limit

values for NO2. These limit values are numerically the same as the NAQO values, but differ in

terms of compliance dates, locations where they apply and legal responsibility.

The limit values are applicable at all locations except:

• where members of the public do not have access and there is no fixed habitation;

• on factory premises or at industrial installations to which all relevant provisions concerning

health and safety at work apply; and

• on the carriageway of roads; and on the central reservations of roads except where there is

normally pedestrian access.

The limit values are mandatory in terms of national Government, whereas there is no legal

obligation to meet the NAQOs. However limit values don’t apply to this assessment as local

authorities have no statutory obligation to assess air quality against them in order to assist with

long-term planning and the assessment of development proposals in their local areas.

7.3 Planning Policy

7.3.1 National Policy

Planning policy in the UK is governed by the National Planning Policy Framework, published in

March 201211 Sustainable development, with an emphasis on economic, social and

environmental sustainability is at the forefront of the policy. It advises that in order to contribute

to conserving or enhancing the natural and local environment, planning considerations should

prevent:

“both new and existing development from contributing to or being put at unacceptable risk from,

or being adversely affected by unacceptable levels of soil, air, water or noise pollution.”

This is to be achieved whilst maintaining adherence to the NAQOs and taking into account the

presence of AQMAs. Developments in AQMAs should also be consistent with the local air

quality action plan.

7.3.2 Local Policy



19

TMBC’s Local Development Framework (LDF) is due to be adopted in 2015; therefore the

Unitary Development Plan (UDP) is a saved document within the LDF and is the principal

document for planning within Tameside. It was adopted in November 2004 and contains a

number of planning policies. Policy T14 discusses the need for a Transport Assessment for

developments with significant transport implications. In relation to air quality it states:

“Applicants will be expected to supply an air quality impact assessment alongside a Transport

Assessment, so that the effect of the traffic generation on any Air Quality Management Area that

may be declared can be considered.”

Policy MW14 Air Quality considers how the Council will respond when a development may

impact on Local Air Quality within the Borough. It states:

“When developments are proposed which could have a significant impact on local air quality,

the Council will consider the extent to which the development may affect the target levels in any

Air Quality Management Areas which are declared or the requirements of related action plans,

and weigh this against other material considerations before granting planning permission.

When developments are proposed within areas where air quality is likely to exceed the

objectives set in the National Air Quality Strategy, the Council will consider the extent to which

occupiers could be exposed to health risks from levels of air pollution in excess of national

targets, taking into account the effect of action plans introduced to reduce such exceedences,

and will weigh this against other material planning considerations before granting planning

permission.”

7.4 Other Guidance

Guidance for local authority air quality and planning officers on how to consider air quality within

the development control process was issued by Environmental Protection UK (EPUK) in April

2010. Although this has no statutory standing, earlier versions have been widely used by local

authorities.


Appendix B - Detailed Assessment Methodology

20

8. Appendix B - Detailed AssessmentMethodology

The contribution of emissions from the road traffic to NO2 and PM10 concentrations are

predicted using the DMRB (v1.03c) model8. This model is widely used in the UK for this type of

assessment.

The model of the proposed development is based on traffic data provided by the design team in

August 2014. Traffic Data used within the assessment is provided below in Table B.1. The

average speed on Porlock Avenue and Hattersley Road was assumed to be 20mph and 28mph

respectively. The percentage of the traffic counts are classified as HGVs for Porlock Avenue

and Hattersley Road are 0% and 13% respectively.

Table B.1 – Traffic Data

Link Baseline 2013 Future Baseline

2015

Future Development

2015

Porlock Avenue 144 145 1168

Hattersley Road

North

2722 2735 3327

Hattersley Road

South

2696 2709 3141

The locations of the key receptors are illustrated in Figure B.1. The receptors are deemed to

represent locations of relevant exposure which will experience the greatest impact to air quality.

Figure B.1 – Receptor Locations

8http://www.dft.gov.uk/ha/standards/guidance/air-quality.htm


Appendix B - Detailed Assessment Methodology

21

Source – © Google

Predicted oxides of nitrogen (NOx, mixture of nitric oxide (NO) and NO2) concentrations were

converted to NO2 using the methodology outlined in the LAQM.TG (09) guidance9.

The dispersion model estimates the concentrations seen across the site arising from road traffic

emissions. It is necessary to add an estimate of the baseline, or background, concentration to

obtain the total concentration for comparison against the NAQOs.

Background ambient concentrations of air pollutants are derived from the Defra modelled

background data for the year 2013 and 2015. Data from the monitoring station was not used as

the data capture was below 90% and therefore data is considered indicative.

9http://laqm.defra.gov.uk/review-and-assessment/tools/background-maps.html#NOxNO2calc

1

2

3

4

5

www.capita.co.uk

Documents

Hyde Primary School Air Quality Assessment Report 27 Aug 2014plandocs.tameside.gov.uk/anitepublicdocs/00208685.pdf · Hyde Primary School Air Quality Assessment 27 August 2014 Executive