If you’ve landed here, there’s a good chance a planning officer has just told you that you need an air quality assessment and you’re not entirely sure what that means, whether you really need it, or what it’s going to cost you. That’s completely normal. It’s one of those planning requirements that sounds far more complicated than it actually is, and getting a straight answer online is surprisingly hard. What is an air quality assessment planning? An air quality assessment (AQA) is a technical report, put together by a qualified air quality consultant, that your local planning authority uses to decide whether your development is acceptable when it comes to air pollution. Here’s the bit most people miss: it works in two directions at once. First, it looks at what your development will do to the surrounding air think extra cars on the road, dust kicked up during construction, or fumes from a biomass boiler. Second, it looks at what the existing air will do to your development which really matters if you’re putting homes, a school or a care home next to a busy road where the air is already poor. That second point catches a lot of developers out. You can have a scheme that barely adds any pollution itself, but if you’re placing new residents somewhere the air already breaches legal limits, the council will still want an assessment. It’s about protecting the people who’ll move in, not just the neighbours. The report is built around the rules that matter in the UK the National Planning Policy Framework, Defra’s Local Air Quality Management guidance, and the Institute of Air Quality Management (IAQM) methodology plus whatever your specific council asks for in its local planning policy. In practice, three things do most of the damage to air quality in the UK: nitrogen dioxide (NO₂), tiny particles called particulate matter (PM₁₀ and PM₂.₅), and construction dust. Traffic is the main culprit for the first two, which is why almost every assessment ends up looking closely at how many extra vehicles your development will bring. When do you actually need an air quality assessment? This is the question everyone wants answered, so let’s be direct. The council has the final say, and every authority is slightly different but based on IAQM guidance and the validation rules most UK councils publish, you’ll usually need an assessment if any one of these is true: A quick self check: do you need one? Run through this. A “yes” to any of these means you very probably need an assessment, and it’s worth confirming the details with a consultant or the council’s environmental health officer before you submit: Honestly, if you’re in a city and building anything of a decent size, the safe assumption is that you’ll need at least a basic assessment. It’s far cheaper to check early than to have your application bounced back weeks down the line. The two types of assessment and which one you’ll need Not all air quality assessments are the same, and the difference matters for your budget and your timeline. It really comes down to one thing: whether the consultant needs to build a dispersion model (a computer model that predicts exactly how pollution spreads). Feature Basic (Screening) Assessment Detailed Assessment Also known as Baseline or screening assessment Air Quality Impact Assessment Uses dispersion modelling? No Yes — usually ADMS-Roads Best for Smaller, lower-risk developments Major schemes, sites in AQMAs, high-traffic locations What’s involved Baseline air review, construction dust risk, traffic screening Everything in a basic assessment, plus modelled pollution levels at specific homes and receptors Typical cost £500–£1,200 £1,500–£4,000+ Typical timescale 1–2 weeks 3–6 weeks (longer if new monitoring is needed) Basic (screening) assessment A basic assessment sets the scene. Your consultant pulls together existing data the council’s own monitoring, Defra’s background pollution maps, and the context of your site to work out what the air is like right now. They then check your development’s expected traffic against the IAQM screening thresholds to see whether a fuller study is needed. Most basic assessments also include a construction dust risk assessment. If your traffic numbers come in under the thresholds and future residents won’t be exposed to unsafe pollution, a basic assessment is often all the council needs. Detailed assessment (Air Quality Impact Assessment) For bigger schemes, or anything in an AQMA, you’ll need the full version. Here the consultant builds a dispersion model nearly always ADMS-Roads to predict pollution levels at specific spots: the new homes, the school across the road, whatever’s nearby and sensitive. Those predicted figures get compared against the UK’s legal air quality objectives, like the 40 µg/m³ annual average for NO₂. If your development pushes things over the line, you’ll then need to look at mitigation. What actually happens during an assessment the process step by step People often imagine this is some mysterious black box. It isn’t. Here’s how it actually runs: The 2024 IAQM dust guidance the update most articles miss Here’s something you won’t find in most of the guides currently ranking for this topic, and it genuinely matters. In 2024, the IAQM published a substantial update to its guidance on assessing dust from demolition and construction the version most people call V2.2. Since nearly every council in the country leans on this exact methodology for construction dust, the update changes how dust risk gets worked out on real projects, which in turn changes the mitigation and monitoring you’ll be asked to put in place. The headline change is in how the “dust emission magnitude” is defined for the four activities demolition, earthworks, construction and trackout. In plain terms, some projects that used to screen as higher risk now land in a lower category, and some the other way round. That directly affects what you’ll need to do on site. Why should you care? Because if your consultant is still quietly using the old 2014 method, your dust assessment could specify the wrong level of control either
7 Must-Know Facts for a Healthier Homeffect Air Quality Introduction – Why Seasonal Air Quality Shouldn’t Be Ignored As crisp autumn mornings shift into the colder clutches of winter, most people focus on staying warm. But there’s an invisible factor that often gets overlooked, air quality, especially indoors. At Freshbreeze Environmental Ltd, we’ve seen how seasonal changes drastically affect the air we breathe, and the health implications can be serious. Whether it’s trapped pollutants, increased heating emissions, or poor ventilation, indoor air quality (IAQ) during colder months deserves urgent attention. Understanding the Science Behind Indoor Air Quality Indoor air quality refers to the cleanliness and chemical composition of the air inside buildings. Unlike outdoor air, which disperses pollutants more freely, indoor air can become a concentrated mix of harmful substances. Common Indoor Pollutants Include: When poorly managed, these pollutants can pose real risks to health and well-being, especially during the seasons when we spend most of our time indoors. How Weather Changes Influence Air Quality As temperatures drop, several environmental factors come into play, affecting both outdoor and indoor air quality: Temperature Inversions Normally, warmer air rises and carries pollutants upward. But in winter, temperature inversions trap a layer of cold air near the ground. This also traps: The result? Air pollution becomes concentrated right where we live and breathe. Increased Use of Heating Systems During winter, we rely on heaters and stoves to stay warm but many traditional systems… especially wood-burning stoves or older furnaces release a surprising amount of indoor air pollutants. Without proper ventilation or filtering, you’re circulating contaminated air. The Problem with Reduced Ventilation in Winter Closing windows keeps the cold out, but it also traps pollutants. VOCs, carbon dioxide, and airborne allergens have nowhere to escape, which leads to stale, unhealthy air. Reduced Ventilation In colder weather, we tend to close windows and seal homes for warmth. This results in less natural ventilation, trapping indoor pollutants such as volatile organic compounds (VOCs), carbon dioxide (CO2), and household dust, leading to poor air quality inside homes and offices. The Hidden Health Risks of Poor Air Quality in Cold Weather Respiratory and Allergy Issues Exposure to VOC’s and particulates can trigger: General Discomfort and Cognitive Fatigue Even for those without allergies, poor air can lead to: Lack of concentration Headaches Brain fog How Freshbreeze Environmental Ltd Can Help Air/ Indoor Quality Assessments The good news is, there are solutions! At Freshbreeze Environmental Ltd, we specialise in Air Quality Assessments that can help identify and mitigate poor air quality in both residential and commercial spaces. We offer expert consultancy services to ensure your indoor environment remains safe and comfortable through every season. Indoor Air Quality Assessments We: Heating System Impact Analysis We analyse the emissions from your existing heating system and recommend safer, cleaner alternatives or filters to minimize pollution. Ventilation Audits & Solutions Our team ensures your space remains well-ventilated even in winter, without wasting heat or increasing energy costs. Take Action Now 🙏 & book Your Air Quality Assessment Benefits of Proactive Indoor Air Quality Management Investing in IAQ improvements can lead to: Greater long-term value for your property Fewer illnesses Better sleep and comfort Lower energy bills through smart ventilation strategies Why Choose Freshbreeze Environmental Ltd? We’re more than just consultants, we’re your air quality partners. With years of experience, cutting-edge tools, and a passion for healthy living spaces, we tailor every service to meet your exact needs. How to Schedule Your Assessment Today Ready to breathe easier? Here’s how to get started:
