Waltham Forest / Planning, sources and design
Air quality assessment in Waltham Forest
Plan your Waltham Forest air quality assessment around current local requirements, road exposure and representative monitoring. ACP supports planning evidence, monitoring and mitigation across Leyton, Walthamstow, Chingford and the wider borough.
Connect development design, particle pollution and relevant Epping Forest pathways with clear evidence.
Discuss your projectCurrent adopted policy
Policy 88, current validation and relevant area-specific guidance.
A transparent local baseline
Automatic stations, diffusion tubes, capture and qualified trends.
Connected assessment
Impact, Neutral, Positive and relevant habitat pathways.
01 / Local context
Road corridors, regeneration and sensitive habitats
Waltham Forest’s development context combines major road exposure, established neighbourhoods, regeneration sites and sensitive habitats. Define the project’s sources and receptors before choosing monitoring, modelling or mitigation. Human exposure and effects on Epping Forest need different assessment pathways.
Crooked Billet and the North Circular
The kerbside automatic site records a different baseline from background locations in Leyton. Check road-facing façades, occupied levels, junction activity and ventilation intakes near this corridor.
Leyton, Lea Bridge and Leytonstone
The tube network covers Lea Bridge Road, High Road Leyton, Ruckholt Road and local junctions. For redevelopment, coordinate traffic, servicing, energy plant and construction with future residential and public-space exposure.
Walthamstow and Blackhorse Lane
Monitoring covers Blackhorse Road, Hoe Street and Forest Road. Town-centre and mixed-use proposals need the street setting, existing activity and future occupants considered together.
Chingford, Whipps Cross and Epping Forest
The northern and eastern forest edge introduces habitat considerations alongside homes, schools and health uses. Review relevant traffic and combustion pathways with ecology, using consistent source and transport assumptions.
Whole-borough AQMA: Defra records Waltham Forest’s designation from 31 October 2001 for annual NO₂ and 24-hour PM₁₀. A result below an objective at a monitor does not revoke that designation or settle exposure at every development site.
02 / Monitoring and trends
Read the trend with its data-quality context
The latest linked report covers 2025 and was published on 31 May 2026. Crooked Billet fell from 36.4 to 34.0 µg/m³, while Dawlish Road rose from 14.9 to 17.7. Both remain below their 2019 levels, but the recent directions differ.
Annual NO₂ / 2019–2025
A lower kerbside result, with capture kept visible
Annual objective: 40 µg/m³
Crooked Billet Roundabout
WL4 · kerbside automatic
34.0µg/m³2025 annual mean
Dawlish Road
WL1 · urban-background automatic
17.7µg/m³2025 annual mean
Shared 0–60 µg/m³ scale · council-reported annual NO₂ results at each monitoring location, including annualisation where required.
Read the annual values
| Year | Crooked Billet WL4 | Dawlish Road WL1 |
|---|---|---|
| 2019 | 58 | 24 |
| 2020 | 42 | 19 |
| 2021 | 45 | 18 |
| 2022 | 41 | 20 |
| 2023 | 40 | 17 |
| 2024 | 36.4 | 14.9 |
| 2025 | 34.0 | 17.7 |
Capture affects interpretation. Crooked Billet’s 34.0 is an annualised result from 53.8% full-year NO₂ capture, using an adjustment factor of 1.190 on a raw mean of 28.5. Dawlish Road’s annual capture was 80.5%; the report notes missing summer data may affect its comparison. Ruckholt Close recorded 18.1 µg/m³ with 97.5% annual capture. Read the results and quality notes.
03 / Network and interpretation
Particles need a separate reading
| 2025 evidence | Annual mean (µg/m³) | Annual capture |
|---|---|---|
| Crooked Billet WL4 · PM₁₀ | 26.6 µg/m³ | 92.4% |
| Dawlish Road WL1 · PM₁₀ | 17.8 µg/m³ | 95.3% |
| Ruckholt Close WL5 · PM₁₀ | 17.4 µg/m³ | 93.6% |
| Dawlish Road WL1 · PM₂.₅ | 10.2 µg/m³ | 95.3% |
Three automatic monitoring stations
The report lists Dawlish Road, Crooked Billet and Ruckholt Close. Compare the appropriate site type and pollutant channel; the inventory alone does not establish a valid full-year series.
58 tube result locations
Table E contains 58 location rows for 2025. Many locations have duplicate tube exposures in the monthly appendix; these are not additional independent monitoring locations. The report uses national bias adjustment and annualisation where needed.
December tube data were excluded
The report discounts December 2025 tube results because of overexposure. Several sites also have lower usable annual capture. Retain the published adjustment and capture notes when using the annual results.
Particle concentrations rose
All three reported PM₁₀ annual means increased from 2024. Dawlish Road PM₂.₅ rose from 9.4 to 10.2 µg/m³. Separate these changes from the longer NO₂ decline and from any future target year.
The PM₂.₅ result should not be presented as proof of a current legal breach solely because it is above a future target concentration. Keep statutory target dates, London ambitions and WHO guidelines distinct. Use Defra borough information with representative local observations and appropriate backgrounds.
04 / Planning requirements
Use adopted policy and the complete checklist
Adopted Policy 88 Air Pollution
Local Plan Part 1 was adopted on 29 February 2024. The final air-pollution policy is numbered 88, not the earlier examination draft’s 90. It addresses Neutral development, exposure, construction and operation, and Positive development in Focus Areas. Policy 88, printed pages 227–229.
Apply the complete current checklist
The current gateway retains the updated 2025 list, with new requirements enforced after 1 January 2026. Entry 11 covers major development subject to its stated emissions exception, poor-air-quality settings and sensitive uses, proximity to sensitive uses, and significant demolition or construction. Entry 11, PDF pages 11–12.
Compare the first occupation year
The validation entry asks for current conditions, construction and operational sources, relevant pollutants, suitable receptors and with/without-development predictions for the first proposed occupation year. For phased schemes, explain the assessment years and occupied receptors in each relevant phase.
Check area-specific supplementary guidance
The Leyton Mills SPD was adopted on 9 July 2024. Use its coordinated neighbourhood guidance where the site falls within its area. Combine relevant site guidance, the adopted plan and the current checklist rather than relying on an older generic document. Leyton Mills SPD and adoption record.
The London air-quality guide and tools explain impact, Neutral and Positive evidence. Keep each workstream, supporting calculation and design decision identifiable in the submission.
05 / Assessment and design
Four Waltham Forest settings, four practical design briefs
These illustrative briefs show how local context changes the evidence needed. Start with the proposed use, occupied receptors, traffic and plant inputs, council request and construction programme.
Crooked Billet: homes facing the North Circular
For an illustrative housing proposal near the junction, assess occupied floors, balconies, play space and intakes against traffic. Explain why the kerbside monitor represents the chosen input, retaining its annualisation and capture limits. Coordinate layout, ventilation, overheating and noise before fixing mitigation.
Useful outputA receptor plan, qualified baseline and tested layout or intake options.
Leyton Mills: coordinated masterplanning
For an illustrative mixed-use phase, assess exposure to the A12, railway and neighbouring uses alongside construction and early occupation. Apply the relevant site-specific SPD guidance; compare first-occupation scenarios and coordinate servicing, energy plant, dust controls and haul routes across phases.
Useful outputA phased assessment brief linking layouts, transport inputs and exposure controls.
Blackhorse Lane: new homes beside existing uses
For an illustrative mixed-use proposal, map existing commercial activity, delivery movements, extract and plant alongside proposed windows and intakes. Assess road exposure at the actual frontage and coordinate air quality, odour and noise. Keep the Neutral calculation and any applicable Positive design evidence identifiable.
Useful outputA shared source inventory, receptor layout and traceable mitigation schedule.
Chingford and Whipps Cross: people and forest receptors
For an illustrative proposal affecting traffic or combustion emissions near the forest edge, use consistent transport and plant assumptions for human exposure and ecological assessment. Identify relevant roads and habitat pathways with ecology and HRA; a site-to-forest distance alone does not resolve the emissions question.
Useful outputAn agreed source–pathway–receptor scope linking air quality, transport and ecology.
Policy 88 supporting text links traffic assessment and monitoring to potential effects within 200m of Epping Forest SAC. Review the relevant road network and emissions pathways with ecology and HRA. Policy 81 and current Epping Forest guidance address recreational pressure and additional urban effects. SAMMS and alternative greenspace provision do not, by themselves, demonstrate that traffic or combustion emissions are acceptable.
Coordinate air quality assessment, noise and odour where the proposal needs shared evidence. Connect proportionate monitoring and mitigation to the programme and any planning-condition response.
06 / Interactive project checklist
Waltham Forest 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 / Current changes
Track the next monitoring and policy updates
The Air Quality Action Plan runs from 2023 to 2028. The 2025 report identifies further particle monitoring and smoke-control work as priorities for 2026. Confirm implementation and usable monitoring before describing those planned changes as established results.
For Local Plan Part 2, the Inspector’s Report was issued on 18 March 2026. The council publishes a post-examination version for information and identifies the basis for steps towards adoption. Check a formal adoption record before treating that version as adopted policy. The examination and latest-news pages checked on 23 October 2026 did not establish adoption.
Current monitoring shows why particles need continued attention alongside NO₂. Keep new annual reports, usable capture, source inventories and the policy status of site-specific guidance under review when preparing a submission.
Common questions / Local answers
Waltham Forest air-quality FAQs
Is all of Waltham Forest in an AQMA?
Yes. Defra records the whole borough from 31 October 2001 for annual NO2 and 24-hour PM10. A monitoring result below an objective does not, by itself, revoke the designation or establish acceptable exposure at every site.
Which adopted air-quality policy applies?
Use Local Plan Part 1 Policy 88 Air Pollution, adopted on 29 February 2024, with London Plan SI1 and current validation requirements. Earlier examination documents used different numbering; the adopted air-pollution policy is 88.
Can development outside a major scheme need assessment?
Yes. Policy 88 and validation entry 11 also address poor-air-quality settings and sensitive receptors, proximity to sensitive uses, and significant demolition or construction. Read the complete requirements for the actual proposal.
Does the borough require Positive development in Focus Areas?
Adopted Policy 88C requires development to be air quality positive in Air Quality Focus Areas. Define the applicable design evidence alongside the separate local-impact and Neutral assessments, using the current policy and London guidance.
What does the latest monitoring report cover?
The newest linked report covers 2025 and was published on 31 May 2026. Crooked Billet NO2 was 34.0 µg/m³ after annualisation from 53.8% annual capture. Dawlish Road was 17.7 and Ruckholt Close was 18.1.
How many diffusion-tube locations are reported?
Table E lists 58 location rows for 2025. Duplicate tube exposures in the monthly appendix are not additional independent locations. December data were excluded for overexposure; retain the capture, bias and annualisation notes.
Did particle concentrations also fall?
No. The three reported PM10 annual means rose from 2024, and Dawlish Road PM2.5 rose from 9.4 to 10.2 µg/m³. Keep the measurement year, capture and applicable target dates clear rather than inferring a current legal breach from a future target.
Does paying a forest contribution settle emissions impacts?
No. The council’s SAMMS and greenspace arrangements address visitor pressure, with additional urban-effects measures where relevant. Traffic or combustion emissions affecting Epping Forest require the appropriate separate pathway review coordinated with transport, ecology and HRA.
Waltham Forest / 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 Waltham Forest Council request or condition, and your target date.
- Local setting. Road exposure, occupied rooms, ventilation, energy plant and construction phases.
- 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.
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Evidence / checked 23 October 2026
Waltham Forest guidance and sources
Measurement and publication years are stated beside the results. Check current documents when preparing a submission.
- Council report library: current annual report and research
- 2025 monitoring: Annual Status Report published 31 May 2026
- Adopted Local Plan Part 1 gateway
- Adopted policies 88 Air Pollution and 81 Epping Forest
- Current council validation gateway
- Full 2025 validation checklist: operative requirements during 2026
- Current Epping Forest guidance and habitat pathways
- Leyton Mills SPD: adopted 9 July 2024
- Local Plan Part 2: Inspector’s Report and post-examination version
- Current Air Quality Action Plan 2023–2028
- Defra whole-borough AQMA designation
- Defra local-authority dashboard
- Leyton Mills adopted SPD: site-specific noise and air quality guidance