Enfield / Planning, sources and design
Air quality assessment in Enfield
Air quality assessment for Enfield’s road corridors, regeneration sites and sensitive new uses. ACP helps you connect local policy, monitoring and mitigation with a clear planning submission.
From the A406 and A10 to Edmonton and the Lee Valley, start with the sources and receptors around your site.
Discuss your projectPolicy → submission
DMD 65, September 2026 validation and relevant area plans.
Evidence → exposure
Roadside and background monitoring, with measured and receptor values clearly separated.
Design → mitigation
Coordinate layout, ventilation, construction phases and relevant habitat effects.
01 / Local context
Match the assessment to the part of Enfield
A406 · Bowes, Palmers Green and New Southgate
The North Circular creates a distinct roadside setting. Assess occupied façades, opening windows and intakes alongside noise and overheating. The area plan calls for living and sleeping rooms to face the less polluted side, with ventilation designed around cleaner air.
A10 · Southbury and Enfield Town
Compare a road-facing conversion with quieter streets behind it. Local traffic, junctions, servicing and the height of proposed bedrooms can change the assessment. Select monitoring evidence for the actual setting rather than using one borough-wide average.
Edmonton · Meridian Water and industrial neighbours
Phased regeneration can place new residents beside continuing works and existing operations. Record construction access, plant, servicing and occupation dates. The Edmonton Leeside plan separately addresses EcoPark redevelopment under EL17 and Deephams under EL18, including odour considerations.
Lee Valley · habitat and emissions pathways
Consider Epping Forest SAC and Lee Valley SPA where an affected road or plant could create a relevant pathway. Coordinate air-quality and ecology assumptions. Recreational-pressure mitigation and emissions assessment address different effects; one does not discharge the other.
Local context: North Circular area plan, p40 · Edmonton Leeside EL17–EL18. Local planning and source context for the assessment brief.
02 / Monitoring and trends
Long-term improvement, mixed recent changes
Enfield’s October 2026 report covers measurements from 2025. All four automatic NO₂ stations recorded small increases from 2024, although concentrations remained below their 2019 levels. Bowes rose from 24 to 25.4 µg/m³; the Enfield 1A tube fell from 45.3 to 43.3 µg/m³.
Annual nitrogen dioxide · 2019–2025
Two settings. Different exposure questions.
Annual objective
40 µg/m³
Bowes Primary School
ENF5 · roadside automatic station
25.4µg/m³2025 annual mean
Enfield 1A
Kerbside · bias-adjusted diffusion tube
43.3µg/m³2025 annual mean
Shared 0–60 µg/m³ scale. Points show reported annual values; the line connects observations. No 2019 result is reported for Enfield 1A.
Annual values and source data
| Year | Bowes · µg/m³ | Enfield 1A · µg/m³ |
|---|---|---|
| 2019 | 41 | Not reported |
| 2020 | 30 | 49.8 |
| 2021 | 30 | 46.9 |
| 2022 | 28 | 45.6 |
| 2023 | 25 | 47.6 |
| 2024 | 24 | 45.3 |
| 2025 | 25.4 | 43.3 |
ASR Tables D, E and O (pp13, 16–17 and 38). 2025 capture: Bowes 95.9%; Enfield 1A 82.7%. Year-to-year changes alone do not identify the effect of a particular traffic scheme.
03 / The wider evidence
Understand the wider monitoring network
| Automatic station | Setting | NO₂ · µg/m³ | 2025 capture |
|---|---|---|---|
| Bush Hill Park · ENF1 | Suburban | 15.5 | 99.5% |
| Derby Road · ENF4 | Roadside | 23.5 | 94.1% |
| Bowes Primary School · ENF5 | Roadside | 25.4 | 95.9% |
| Prince of Wales School · ENF7 | Urban background | 15.7 | 92.1% |
Diffusion tubes · finer roadside coverage
The 22 reported locations complement the four automatic stations. The report applies a national bias factor of 0.78 for 2025. Choose comparable roadside or background locations and check capture, annualisation and receptor distance before using a result.
Particles · retain the coverage caveat
Bowes reports PM₁₀ of 14.6 and PM₂.₅ of 8.9 µg/m³. Tables G and I record only 7.8% full-year capture, while the narrative says the replacement analyser began in April. That inconsistency needs clarification before these values support an annual compliance conclusion.
Indicative sensors · useful additional context
Appendix C reports NO₂ and PM₂.₅ sensors at North Middlesex Hospital and Meridian Angel Primary School, with missing early-2025 months. The council web summary names a different second site. Use the dated report for 2025 and verify current deployment before designing a survey.
Background · choose the right evidence
Compare the council network with Defra background information and LondonAir records for the same year. A suburban or urban-background monitor represents a different setting from the kerbside. Provisional live readings describe recent conditions; they are not a ratified annual baseline.
ASR methods and coverage (pp35–41) · Defra local-authority dashboard · LondonAir monitoring records.
04 / Council policy and guidance
A clear route through Enfield’s requirements
| Document | What the application should address |
|---|---|
| DMD 65 · Air quality | Air Quality Neutral development, effects on local air quality, and exposure of sensitive uses. Major schemes in hotspots and development with significant air-quality implications require assessment. |
| DMD 64 · Pollution control | Demolition, construction, operation and maintenance. Keep air, dust, noise and odour assumptions consistent where sources or receptors overlap. |
| London Plan SI 1 | Apply the relevant assessment, Neutral and Positive requirements alongside local policy. A Neutral calculation does not answer every local exposure question. |
What the September 2026 checklist asks for
The current non-householder checklist lists major development and schemes with potentially significant direct or indirect air-quality effects. Its detailed assessment examples include:
- Major schemes exposing occupants beside busy roads, diesel railways or congested areas.
- Substantial demolition or earthworks.
- Development significantly changing traffic on busy roads.
- Sensitive uses introduced into areas of poor air quality.
Read the assessment entry on page 16. Select the checklist for the application type and agree the proportionate evidence at the outset.
North Circular area plan
Within its mapped boundary, coordinate the road-facing frontage with quieter living and sleeping rooms, cleaner-side ventilation and noise design. Environmental mitigation policy, p40.
Edmonton Leeside and other area documents
Check EL17 for EcoPark-related proposals and EL18 for Deephams, including odour and neighbouring development. Also check the North East Enfield area plan, Meridian West SPD or other documents where their boundaries cover the site. Use the adopted-plan register.
DMD 64–65 and Appendix 11 · London policy, Neutral and Positive guide. Appendix 11 contains historical hotspot evidence; it is not a current concentration map.
05 / Assessment and design
Turn the evidence into design decisions
New bedrooms beside a busy road
Compare the occupied façade, opening windows and air intakes with representative evidence. Test layout options while the ventilation, overheating and acoustic strategies can still be coordinated.
Outline applications and staged occupation
Define a realistic assessment envelope for traffic, plant and phasing. Record what is fixed now and which details require later review. Early residents may become receptors during later construction.
Industrial neighbours and energy plant
Identify actual activities, emissions, flues and duty cycles. Include neighbouring sources where they could affect the scheme, and the scheme’s own effects on existing neighbours.
Ecology and nitrogen deposition
Where the affected road network or plant emissions connect to designated habitats, coordinate the assessment purpose, scenarios and receptor locations with the ecology workstream. Human-health objectives do not answer every ecological question.
Bring noise, odour and air quality assessment inputs into a common project brief.
06 / Interactive project checklist
Enfield evidence planner
Answer five questions to organise the assessment brief. Choose “Not sure yet” where information is missing; those points remain visible in your results.
Answers stay in this page. The planner organises evidence; it does not certify compliance or decide planning requirements.
07 / Local action and emerging policy
What is changing in Enfield?
What Enfield has been doing
The latest ASR describes the Bowes and Fox Lane quieter-neighbourhood schemes as permanent, alongside School Streets, anti-idling work and NRMM checks. These measures help explain local transport and construction priorities. They do not prove that any one measure caused a monitor’s change. See action-plan progress, pp29–34.
What is still emerging
The new Local Plan remains in examination on the council gateway checked for this review. Its September 2025 air-quality note identifies exposure concerns at Colosseum Retail Park, Upton/Raynham Road and the former New Southgate gasholder site. It discusses emerging ENV1 and possible modifications. Read the site-specific examination note.
Status checked 20 October 2026: New Local Plan examination · Current monitoring and action-plan library. The council continues to link its 2022–2027 Air Quality Action Plan.
Common questions / Local answers
Enfield air-quality FAQs
Is the whole of Enfield in an AQMA?
Yes. Defra records a whole-borough AQMA, declared on 31 March 2001, for annual nitrogen dioxide and daily PM10. A designation and an individual monitoring result answer different questions.
When does Enfield ask for an air quality assessment?
The September 2026 checklist covers major development and schemes with significant direct or indirect air-quality effects. Examples include exposed occupants beside busy roads, substantial demolition or earthworks, significant traffic changes and sensitive uses in poor air quality. Read these with DMD 65 and London Plan SI 1.
Does Enfield use diffusion tubes?
Yes. The report published in October 2026 lists 22 NO2 diffusion-tube locations for 2025 alongside four automatic NO2 stations. Check capture, bias adjustment and any receptor-distance correction.
Why does Enfield 1A show both 43.3 and 32.7?
The 43.3 µg/m³ value is the reported 2025 mean at the kerbside tube. Table O predicts 32.7 µg/m³ at the receptor after distance adjustment. Keep the measured and adjusted values separate.
Do lower NO2 readings remove the need for assessment?
No. Scope depends on the proposal, source and receptor setting, local policy and the council request. Exposure, new emissions, particles, construction dust and relevant ecological effects can still need assessment.
Can the 2025 particle values prove annual compliance?
The report lists PM10 at 14.6 and PM2.5 at 8.9 µg/m³ at Bowes, but records 7.8% full-year capture in both particle tables. Clarify that coverage and representativeness before using the values for annual conclusions.
Can air quality affect protected habitats near Enfield?
Yes. Relevant road or plant emissions can create pathways to designated habitats, including Epping Forest SAC and Lee Valley SPA. Scope depends on the source and affected receptors. Recreational mitigation addresses a different effect; coordinate any air-quality and ecology evidence.
What information helps with a phased development?
Provide the phasing and occupation programme, construction access, occupied receptors and the assumptions for traffic, plant and ventilation. Identify which details are fixed and which require later assessment.
Enfield / Your next step
Discuss your air quality project
Tell us what you are proposing and where you are in the planning process.
What to include
- Site and proposal. Address or postcode, proposed use and approximate number of homes or floorspace.
- Planning stage. Application reference, any Enfield Council request or condition, and your target date.
- Local setting. Nearby busy roads, industrial uses, proposed plant or changes to traffic and deliveries.
- Existing information. Mention available drawings, previous air quality reports and traffic or plant details.
Start with what you have. You can email drawings or council correspondence using the address below.
Your details are handled under our privacy policy.
Evidence / checked 20 October 2026
Enfield guidance and sources
Measurement and publication years are stated beside the results. Check current documents when preparing a submission.
- Council pollution gateway and current annual report
- 2025 measurements: ASR published October 2026
- Current adopted plans
- Development Management Document: DMD 64, DMD 65 and Appendix 11
- Current planning application gateway
- 28 September 2026 validation checklist: applications except householders
- New Local Plan examination and air-pollution evidence
- Defra: current Enfield AQMA
- Defra local-authorities dashboard
- Council Air Quality Action Plan 2022–2027
- North Circular Area Action Plan: environmental mitigation
- Edmonton Leeside: EcoPark, Deephams and protected habitats
- September 2025 examination note: site-specific air-quality issues
- LondonAir: provisional readings and monitoring records