Who can prepare an air quality assessment

Air quality assessments are not a regulated activity, so nobody holds a licence for them the way an ecologist holds a bat licence. What councils do instead is test the author against the guidance the assessment claims to follow. If a report says it applies Institute of Air Quality Management methods, the environmental health officer will expect an author who works to those methods routinely and can defend the assumptions inside the model.

For a restaurant, a gym, a nursery or a takeaway, that matters in a specific way. The assessment is usually small, the budget is tight, and the officer reviewing it deals with air quality reports every week.

What environmental health asks about the author

The consultation response on a commercial application often starts with a question about competence, phrased as a query about methodology. Officers want to see three things stated in the report itself.

Who wrote it, with their professional affiliation and the type of assessments they carry out. Which guidance the assessment follows, named and dated. And what the author did rather than what a template says, including the dates of any monitoring and the source of the background data.

A report that names no author, or names a company without an individual, invites a request for clarification before anything technical is discussed. Put the name, the qualification and a short competence statement on the second page.

Institute of Air Quality Management membership

The Institute of Air Quality Management is the usual marker of competence in England. Its membership grades signal assessed experience, and its guidance documents on development control and on construction dust are the standards most local authorities work to.

Membership is not a legal requirement and there are competent practitioners without it, particularly acousticians and environmental scientists who do air quality as part of a wider practice. What matters is whether the author can show relevant assessments of the same type. For a small commercial change of use, an author who normally models motorway schemes may be no better placed than a local consultant who assesses kitchen extraction every month.

Where the work involves odour as well as air quality, the competences differ again, and odour assessment competence and olfactometry covers what separates them.

Modelling competence against monitoring competence

Two different skills sit behind an assessment, and not every author has both.

Monitoring means placing diffusion tubes or automatic analysers, running them for a representative period, applying bias adjustment and converting oxides of nitrogen to nitrogen dioxide using the published tools. The errors here are practical: tubes in the wrong place, too short a run, no bias adjustment, results presented without the uncertainty attached.

Dispersion modelling means building a source and receptor model, selecting meteorological data, verifying the model against local monitoring and reporting the verification factor. The errors here are technical and harder for a non-specialist to spot: unverified models, meteorological data from a distant station with no justification, receptor heights chosen to flatter the result.

Ask which of the two the assessment needs before appointing anyone. A small change of use in an air quality management area often needs neither, because the question is exposure and mitigation rather than concentration prediction.

There is a simple test for a report you have been handed. Find the paragraph that says how the background concentration was derived and the paragraph that says how the model or the monitoring was checked. If either is missing, the author either skipped the step or did not think it needed explaining, and both answers are a problem when the environmental health officer asks.

Construction dust and the smaller scheme

For most commercial fit-outs and conversions, construction dust is the part that actually engages the guidance. The Institute's dust guidance works through a risk classification by activity, a sensitivity assessment based on receptors nearby, and a mitigation schedule matched to the resulting risk band.

It is a proportionate method and it is designed to be applied without modelling. The failure mode is applying the mitigation schedule without doing the classification, so the report proposes measures for a high-risk site on a job that is plainly low risk, and the officer cannot tell whether the method was followed. Show the classification working.

Damage costs and mitigation contributions

Where a scheme generates additional vehicle emissions, some authorities seek a contribution calculated using the damage cost approach published by government, and others require emission mitigation measures instead, such as electric vehicle charging, low emission plant or a travel plan commitment.

The competence needed here is arithmetic and policy reading rather than modelling. Check which approach your authority uses before the assessment is written, because a report built around concentration modelling cannot easily be converted into a damage cost calculation afterwards. In London, the air quality neutral benchmarks in the London Plan apply to building and transport emissions and have their own method, which a non-London consultant may not have used.

Where assessments get rejected

The pattern across refusals and holding objections is consistent.

• Background concentrations taken from a national map without checking local monitoring in the same street.
• No verification of a dispersion model against local data.
• A declared assessment year that does not match the likely year of opening.
• Extraction and odour handled inside the air quality report rather than dealt with properly in a Ventilation and Extraction Statement.
• Mitigation proposed that the applicant has no means of delivering, such as filtration that requires plant space the building does not have.

The last one bites hardest for small businesses. A mitigation measure written into an assessment becomes a condition, and a condition you cannot discharge stops you opening.

Briefing for the right scope

Write the brief around three questions. What is the receptor that concerns the council, which is usually a neighbouring residential window or a school. What is the source, which for a commercial occupier is usually the kitchen flue, the plant deck or the delivery vehicles. And what decision does the council need to make, which is nearly always whether a condition can control the effect.

Then ask the author for a scope note before instructing, setting out the guidance to be followed, whether monitoring or modelling is proposed, and what will be excluded. A scope note costs nothing and prevents the two most expensive outcomes: paying for modelling that was not needed, and buying a desk assessment when the officer wanted measurements.

Where overheating or ventilation issues arise alongside air quality in the same building, the competence question for a TM59 overheating assessment follows a similar shape, and the two are often commissioned together for residential conversions.

Getting a draft reviewed rather than written from scratch

Councils usually expect an air quality assessment to have a suitably qualified author, and professional review is strongly advised for anything beyond a simple dust risk classification. PlanScope drafts an Air Quality Assessment structured to the sections councils expect, citing policy and flagging with a clear marker every site fact that has to be supplied, including monitoring data and background concentrations it cannot know.

That draft is a starting point for a qualified assessor, not a replacement for one. The professional directory is the route to a reviewer who can check the methodology, sign off the assessment and take responsibility for its conclusions. PlanScope provides AI-assisted draft reports for planning applications. Reports should be reviewed before submission. We do not guarantee planning approval.

This is general guidance, not legal advice. Confirm the assessment scope with your local planning authority's environmental health team before commissioning any work.