Air Quality Matters

This week, we dive into a comprehensive review published in the Science of the Total Environment titled Integration of Air Quality Monitoring Systems with Hybrid Electric Vehicles for Emissions Control in Smart Cities, to explore a question that fundamentally challenges how we think about urban air pollution: What if the single biggest opportunity to tackle air quality in our cities isn't just making vehicles cleaner—but transforming them into intelligent, mobile monitoring networks that actively adapt their behavior based on real-time pollution data

Key Topics Discussed:

Adaptive Green Zones: Currently, hybrid cars are incredibly smart internally. They switch between internal combustion engine and battery based on efficiency, charge levels, and acceleration. But they are completely blind to environmental conditions outside the windshield. Imagine integrating a miniaturised air quality monitoring system into the car using IoT sensors and vehicle to everything communication. If a smart vehicle drives into a heavily polluted urban zone, say outside a school at drop off time or a congested city centre, the onboard AI reads the local air quality data and automatically forces the car to switch entirely to battery power. It shuts off the combustion engine. It stops contributing to the local pollution hotspot instantly.

AI Driven Eco Routing: By linking up with smart city infrastructure and using machine learning, these vehicles can use AI driven eco routing. Your GPS wouldn't just find the faster route. It could find a route that minimises your exposure to highly polluted areas, spreading the traffic load and protecting the occupants inside the cabin. It turns the vehicle from a passive polluter into an active dynamic participant in urban air quality management.

The Technical Hurdles: It's not as simple as strapping a sensor to a bumper. We need incredibly robust, low cost sensors that don't lose their calibration every time a car goes over a pothole or experiences a shift in humidity. There's a massive communication challenge. Do we use 5G or DSRC? The latency has to be milliseconds for cars to communicate effectively. And then there's data privacy. Tracking a car's location, speed, and the air it's driven through raises questions. We need standardised, highly secure cryptographic protocols so that data can be shared with city infrastructure without compromising driver privacy.

The Future of Urban Air Quality Management: This is the frontier. The future of clean air isn't just about sticking static expensive reference sensors on a few lampposts around the city. It's about leveraging the millions of vehicles already on the road, turning them into dynamic moving networks of data that physically alter how our cities operate in real time. It's a huge technical challenge, but the payoff for urban health could be transformative.

A comprehensive review on the integration of air quality monitoring systems with hybrid electric vehicles for emission control in smart cities

https://doi.org/10.1016/j.scitotenv.2025.180022

The Air Quality Matters Podcast in Partnership with

Particles Plus https://particlesplus.com/

Eurovent (https://www.eurovent.eu/) - Aico (https://www.aico.co.uk/) - Lindab (https://www.lindab.ie/) - S&P UK (https://www.solerpalau.com/en-uk/)

The One Take Podcast in Partnership with

SafeTraces (https://www.safetraces.com/) - Inbiot (https://www.inbiot.es/?utm_campaign=simon&utm_source=airqualitymatters&utm_medium=podcast) - Farmwood (https://farmwood.co.uk/) - iE Electronics (https://www.eielectronics.ie/) and iAir Group (https://iair-group.com/)

Zehnder https://www.zehndergroup.com/en

Do check them out in the links and on the Air Quality Matters Website. (https://www.airqualitymatters.net/podcast)

If you haven't checked out the YouTube channel its here (https://www.youtube.com/@airqualitymatters-SimonJones). Do subscribe if you can, lots more content is coming soon.

This week, we dive into a modelling study published in Environmental Science, Processes and Impacts titled Long-Term Prediction of Climate Change Impacts on Indoor Particulate Pollution, a case study of residential buildings, to explore a question that fundamentally challenges how we think about natural ventilation and climate adaptation: What if the single biggest barrier to maintaining healthy indoor air quality in the coming decades isn't just outdoor pollution—but our complete failure to recognise that rising temperatures are transforming our homes into chemical reactors that generate dangerous ultrafine particles right where we breathe?

Key Topics Discussed:

The Chemistry Problem: Initially, there is some good news. Because of tightening air pollution legislation globally, the baseline outdoor particulate matter, things like PM2.5 and PM10 from traffic and industry, is actually projected to decrease in Europe over the next century. But the chemistry of our indoor spaces is changing. As outdoor temperatures rise, outdoor ozone levels also rise. And as our homes get warmer, the emission rate of volatile organic compounds or VOCs from indoor furnishings increase. When ozone and limonene meet in your living room, they react, and they produce something called secondary organic aerosols, or SOAs, including particulate matter and things like formaldehyde. So while the overall mass of large particles coming in from traffic might drop, the chemistry happening right inside our homes is going to create a whole new soup of ultrafine particles.

Extreme Weather Events: The study didn't just look at average days. It looked at extreme weather events, which we know are becoming more normal. They simulate a Saharan dust storm and an extreme heat wave accompanied by an ozone episode. During the simulated heat wave, they looked at typical human behaviour. We keep the windows closed during the day, and in the evening when it cools down, we throw the windows wide open to purge the heat. But during an ozone episode, when you open those windows in the evening, you are absolutely flooding your home with ozone. The simulation showed indoor ozone levels spiking dramatically, which then reacts with limonene to create massive spikes in secondary organic aerosols.

The End of Natural Ventilation as We Know It: This fundamentally challenges our reliance on natural ventilation in the face of climate change. If opening a window to cool down means inviting in extreme heat, extreme ozone or a massive spike in particulate matter from a dust storm, we simply can't rely on that primary strategy anymore. The paper makes an incredibly compelling case that proper strategies of high efficiency filtration, decent ventilation systems and potentially even scrubbers for gases is going to transition from being a luxury in high end office buildings to perhaps an absolute public health necessity in even our residential homes. Our building envelopes may have to act as an environmental shield against increasingly hostile outdoor atmospheres.

Long-term prediction of climate change impacts on indoor particle pollution– case study of

a residential building in Germany

https://doi.org/10.1039/d4em00663a

The Air Quality Matters Podcast in Partnership with

Particles Plus https://particlesplus.com/

Eurovent (https://www.eurovent.eu/) - Aico (https://www.aico.co.uk/) - Lindab (https://www.lindab.ie/) - S&P UK (https://www.solerpalau.com/en-uk/)

The One Take Podcast in Partnership with

SafeTraces (https://www.safetraces.com/) - Inbiot (https://www.inbiot.es/?utm_campaign=simon&utm_source=airqualitymatters&utm_medium=podcast) - Farmwood (https://farmwood.co.uk/) - iE Electronics (https://www.eielectronics.ie/) and iAir Group (https://iair-group.com/)

Zehnder https://www.zehndergroup.com/en

Do check them out in the links and on the Air Quality Matters Website. (https://www.airqualitymatters.net/podcast)

If you haven't checked out the YouTube channel its here (https://www.youtube.com/@airqualitymatters-SimonJones). Do subscribe if you can, lots more content is coming soon.

This week, I step back from the interviews to share a personal reflection on the conversations, themes and patterns that have emerged over the last few weeks, both on this podcast and in the halls and sessions of Indoor Air 2026 in Singapore. What if the single biggest barrier to transforming the built environment isn't our lack of scientific knowledge or technology—but our complete failure to recognise the deeply interconnected systemic, linguistic, economic and human forces that keep us locked in the same destructive cycles?

Key Topics Discussed:

The Linguistic Firewall: During the pandemic, we saw in real time how a single word could paralyse global action. The term airborne became a structural firewall. To an engineer, if a particle is suspended in the air and moves with the air currents, it's airborne. But to the medical community, airborne carries a very specific, high-consequence historical definition. Because of that deeply entrenched medical definition, the engineering and building science communities were effectively locked out of the operational response for months.

The Tyranny of Efficiency: For the better part of the last 40 or 50 years, the dominant almost tyrannical metric in our industry has been efficiency. We chased energy performance relentlessly. Energy is a hard measurable cost. You get a utility bill every 30 days. It is incredibly difficult to put a hard financial number on human health. So we optimize for what we can measure.

The Myth of the Average Person: We design multi million dollar HVAC systems to hold a massive commercial floor plate to a highly precise 21 degrees Celsius. The glaring problem is that the average person is a statistical ghost. When you design for the mathematical average, you are effectively designing for nobody. Instead of viewing human comfort and health as a single fragile optimal point on a graph, we need to view it as a geographical landscape.

The Looming Energy Crisis: The IEA warns of the greatest energy security threat in history. When the grid is constrained, society panics. And when society panics about energy, the built environment is always the first casualty. We know exactly what this looks like because we've been here before. In the wake of the 1973 oil embargo, we sealed our buildings up, slashed ventilation standards and triggered an era of sick building syndrome. The temptation to repeat the mistakes of the 1970s is sitting right in front of us. This is an inflection point. The challenge for all of us is to hold our nerve and fiercely defend the invisible air that sustains us, ensuring that as the world changes around us and as the energy grid strains, we never again compromise the indoor environment.

The Air Quality Matters Podcast in Partnership with

Particles Plus https://particlesplus.com/

Eurovent (https://www.eurovent.eu/) - Aico (https://www.aico.co.uk/) - Lindab (https://www.lindab.ie/) - S&P UK (https://www.solerpalau.com/en-uk/)

The One Take Podcast in Partnership with

SafeTraces (https://www.safetraces.com/) - Inbiot (https://www.inbiot.es/?utm_campaign=simon&utm_source=airqualitymatters&utm_medium=podcast) - Farmwood (https://farmwood.co.uk/) - iE Electronics (https://www.eielectronics.ie/) and iAir Group (https://iair-group.com/)

Zehnder https://www.zehndergroup.com/en

Do check them out in the links and on the Air Quality Matters Website. (https://www.airqualitymatters.net/podcast)

If you haven't checked out the YouTube channel its here (https://www.youtube.com/@airqualitymatters-SimonJones). Do subscribe if you can, lots more content is coming soon.

Chapters

00:00:00 Introduction: Reflections from Indoor Air 2026 and the Power of Conversation
00:01:30 The Crisis Cycle: Why We Design for Emergencies but Operate for Peacetime
00:04:07 The Airborne Language Barrier: When Medical Definitions Paralyze Engineering Action
00:07:11 The Tyranny of Energy Efficiency: How We Optimized Buildings for Spreadsheets Not Humans
00:11:49 The Myth of the Average Person: Why Designing for Statistical Ghosts Fails Everyone
00:16:44 The Comfort Paradox: Is Thermal Perfection Making Us Biologically Fragile?
00:21:46 The Invisibility Problem: Why Data Doesn't Move Hearts and How to Tell Better Stories
00:24:38 Proxies and Noise: The Double-Edged Sword of CO2 Sensors and Simple Solutions
00:27:47 The Accountability Gap: From Run-to-Failure to Mandatory Building Performance Checks
00:32:11 The Global South Crossroads: A Fleeting Window to Leapfrog Western Mistakes
00:35:33 The AI Energy Arms Race: When Data Centers Compete with Humans for Cooling Capacity
00:37:19 The AMR Connection: How Poor Ventilation Fuels the Antimicrobial Resistance Crisis
00:40:10 The Skilled Trades Bottleneck: Why the Workforce Crisis Is Our Greatest Limiting Factor
00:43:09 The 1970s Déjà Vu: Navigating the Energy Crisis Without Sacrificing Human Health Again

This week, we dive into a fascinating study from the University of Southampton and Hampshire County Council titled Preliminary Findings of Storytelling in Schools as a Pre-Heatwave Intervention to Enhance Children's Behaviour to Improve Thermal Comfort, to explore a question that fundamentally challenges how we think about overheating in schools: What if the single biggest barrier to protecting children from dangerous heat exposure in classrooms isn't just our aging building stock—but our complete failure to recognize that empowering children themselves to take simple adaptive actions could be the most immediate, scalable solution we have right now?

Let's face it, our school building stock, especially in the UK, is ageing and frankly poorly equipped for the reality of modern summers. A massive portion of schools, about 40% in the UK like Hampshire, are scholar system buildings thrown up in the 1960s and 70s. They were lightweight with huge amounts of single-glazed windows and very low thermal mass. They were designed to keep kids warm in winter with absolutely no thought given for handling the 30 to 35 degree heat waves we are increasingly seeing.

Key Topics Discussed:

The Temperature Preference Gap: Children actually have a preference for lower temperatures than adults. Studies have shown their comfort temperatures are usually two to three degrees cooler than ours. But who controls the environment in a classroom? Who controls the windows, the blinds, the thermostats? The teachers. So you have adults with a higher thermal threshold making the environmental decisions for children who are already feeling the heat. Younger children, especially those in key stage one aged five to seven, just don't have the agency or confidence to change their environment. They aren't going to stand up in the middle of a lesson and say, Miss, I'm boiling, can I open that window? They just sit there. They overheat. Their cognitive performance drops off a cliff and they become exhausted.

The Storybook Intervention: The researchers designed a low cost, incredibly creative intervention. They wrote a storybook called The Hottest Day at School. It's a simple, engaging story where different characters through history- a Viking in the North Sea, a gladiator in the Coliseum, and a cowboy in the Wild West- use different strategies to keep cool. The story focused on five key actions: using a fan, removing a layer of clothing, moving to the shade, opening a window, and finding a drink of water. The researchers set up a controlled study right before a yellow heatwave alert was issued by the UK Health Security Agency.

The Results Were Fantastic: The children in the intervention groups, particularly the younger key stage one kids, were significantly more likely to take or want to take action to improve their thermal comfort. The kids who heard the story were nearly five times more likely to say they wanted to stay in the shade. They were almost eight times more likely to recognise they should drink cold water. And they were almost 12 times more likely to want to use a fan compared to the control group. They actively remembered and understood the behaviours modelled in the story

Preliminary Findings of Storytelling in Schools as a Pre-Heatwave Intervention to Enhance Children's Behaviour to Improve Thermal Comfort https://doi.org/10.1016/j.buildenv.2024.112337

The Air Quality Matters Podcast in Partnership with

Particles Plus https://particlesplus.com/

Eurovent (https://www.eurovent.eu/) - Aico (https://www.aico.co.uk/) - Lindab (https://www.lindab.ie/) - S&P UK (https://www.solerpalau.com/en-uk/)

The One Take Podcast in Partnership with

SafeTraces (https://www.safetraces.com/) - Inbiot (https://www.inbiot.es/?utm_campaign=simon&utm_source=airqualitymatters&utm_medium=podcast) - Farmwood (https://farmwood.co.uk/) - iE Electronics (https://www.eielectronics.ie/) and iAir Group (https://iair-group.com/)

Zehnder https://www.zehndergroup.com/en

Do check them out in the links and on the Air Quality Matters Website. (https://www.airqualitymatters.net/podcast)

If you haven't checked out the YouTube channel its here (https://www.youtube.com/@airqualitymatters-SimonJones). Do subscribe if you can, lots more content is coming soon.

Chapters

00:00:00 Introduction: The One Take Format and the Overheating Schools Crisis
00:01:06 The Building Problem: Why UK Schools Weren't Built for Modern Summers
00:01:46 The Agency Gap: When Adults Control Environments Designed for Children
00:02:47 The Intervention: Teaching Thermal Comfort Through Story
00:03:13 The Study Design: Controlled Testing Before a Yellow Heatwave Alert
00:03:58 The Results: Five to Twelve Times More Likely to Take Action
00:04:44 The Bigger Picture: Why We Can't Wait for Billions in Retrofits
00:05:14 Behavioral Adaptation: The Overlooked Tool in Indoor Environmental Quality
00:06:11 From Passive Victims to Active Agents: Lessons for Air Quality

This week, we sit down with Professor Ardeshir Mahdavi, an internationally recognised expert in building science, affiliated with Graz University of Technology and the Vienna University of Economics and Business, to explore a question that fundamentally challenges how we think about indoor environmental quality: What if the single biggest barrier to creating healthy, comfortable buildings isn't our lack of scientific models—but our failure to recognise that the search for optimal indoor conditions may be philosophically flawed from the start?

Inspired by his thought provoking keynote at Indoor Air 2026 in Singapore, this conversation unpacks what happens when we bring philosophy, art and science together to critically revisit the prevailing paradigm in indoor environmental quality research. Drawing on insights from Aristotle, Leonardo da Vinci and Werner Heisenberg, Ardeshir challenges us to reconsider how we define adequate indoor environmental conditions, how we develop models to predict human comfort and health, and whether our obsession with precision is actually preventing us from understanding what truly matters.

Key Topics Discussed:

The Illusion of Sharp Lines: Standards and regulations draw precise thresholds for temperature, humidity, CO2, sound and light. But human requirements are not fixed. They vary by individual, by age, by health status, by time of day, by culture. We all agree people are different, yet we expect models to deliver universal answers. This cognitive dissonance shapes everything from thermal comfort research to building commissioning. Leonardo da Vinci's sfumato technique offers a metaphor: nature doesn't have sharp lines, and neither do human needs.

Plateau and Escarpment, Not Bell Curves: The traditional view of human response to indoor conditions assumes a bell curve with an optimal peak. But research in lighting and other domains suggests a more accurate model is the plateau and escarpment. Over a wide range of conditions, performance remains stable.

Health Versus Comfort, and the Ethics of Manipulation: Some argue that comfort is not necessarily healthy. That we should design buildings to challenge occupants thermally, to exercise their metabolic and immune systems. But who decides what is good for people? Designing stairs to be more attractive than lifts, separating buildings to force movement, installing acoustic masking systems without informing occupants.

The Heisenberg Metaphor and Model Uncertainty: Heisenberg's uncertainty principle states that you cannot simultaneously measure the position and momentum of a particle with unlimited precision. The more precisely you know one, the less precisely you know the other. This offers a powerful metaphor for indoor environmental quality models.

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GUEST:

Professor Ardeshir Mahdavi

Graz University of Technology | Vienna University of Economics and Business

Indoor Air 2026

The Air Quality Matters Podcast in Partnership with

Particles Plus https://particlesplus.com/

Eurovent (https://www.eurovent.eu/) - Aico (https://www.aico.co.uk/) - Lindab (https://www.lindab.ie/) - S&P UK (https://www.solerpalau.com/en-uk/)

The One Take Podcast in Partnership with

SafeTraces (https://www.safetraces.com/) - Inbiot (https://www.inbiot.es/?utm_campaign=simon&utm_source=airqualitymatters&utm_medium=podcast) - Farmwood (https://farmwood.co.uk/) - iE Electronics (https://www.eielectronics.ie/) and iAir Group (https://iair-group.com/)

Zehnder https://www.zehndergroup.com/en

Do check them out in the links and on the Air Quality Matters Website. (https://www.airqualitymatters.net/podcast)

If you haven't checked out the YouTube channel its here (https://www.youtube.com/@airqualitymatters-SimonJones). Do subscribe if you can, lots more content is coming soon.

Chapters

00:00:00 Introduction: Meeting Ardeshir Mahdavi and the Philosophy of Indoor Environmental Quality
00:02:35 The Risk of Narrow Focus: Why Building Science Needs Philosophical Thinking
00:15:55 Da Vinci's Sfumato: Sharp Lines Versus the Reality of Human Experience
00:22:45 The Problem with Precision: Standards, Negotiation and Boundary Conditions
00:36:16 Aristotle's Wisdom: Matching Methods to the Nature of the Inquiry
00:41:45 Models and Constructs: The Difference Between Weight and Comfort
00:50:01 The Plateau and Escarpment Model: Rethinking Distribution Curves
00:59:09 Physiology and Compensation: Why Humans Aren't Precise Instruments
01:03:17 Health Versus Comfort: The Ethical Question of What Buildings Should Provide
01:07:16 Manipulation and Agency: Staircases, Sound Masking and Cultural Differences
01:33:32 The Global South Challenge: Beyond Smart Buildings to Urban Systems
01:47:04 Heisenberg's Uncertainty: Precision Limits in Human-Centric Models
01:54:22 AI and Understanding: Tools Versus Delegation of Thinking