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The landmark ImpAQS study examining ventilation and air quality in 1,200 Austrian schools reveals widespread failure to meet minimum standards, with at least 25% of classrooms unable to maintain acceptable CO2 levels during operational hours.

Professor Rob McLeod discusses how this comprehensive year-long study uncovered significant disparities in ventilation effectiveness between schools, creating an "air quality lottery" for students and teachers.

• Comprehensive monitoring of CO2, temperature, and humidity across all nine Austrian federal regions throughout the 2023-2024 school year
• Matched pair study comparing 600 classrooms with visible CO2 monitors against 600 control rooms with hidden sensors
• Only 10% of Austrian schools have mechanical ventilation systems, with most relying entirely on natural ventilation
• CO2 monitors dramatically improve ventilation behaviours, with over 90% of classrooms spontaneously appointing student "ventilation champions"
• Cultural resistance and misconceptions about ventilation creating barriers to proper air exchange
• Occupant density as a critical factor, with special schools providing 3+ square meters per student achieving superior air quality
• Outdoor air pollution near schools often exceeding WHO guidelines, complicating ventilation strategies
• Need for national-level intervention rather than leaving air quality challenges to individual schools
• Disparities between schools creating educational and health inequalities that require systematic triaging of solutions

Rob McLeod - LinkedIn

ImpAQS Report

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Research reveals that a mother's exposure to air pollution during pregnancy could significantly increases her child's risk of developing asthma, suggesting that our respiratory health journey begins before we take our first breath.

The study conducted in China tracked mothers and their children from 2015-2018, analyzing exposure to various pollutants throughout different stages of pregnancy.

• PM2.5 exposure during the second trimester is strongly linked to childhood asthma development
• PM10 exposure in the third trimester is similarly associated with increased asthma risk
• Sulfur dioxide exposure throughout pregnancy correlates with higher asthma rates
• Nitrogen dioxide shows complex effects, with first trimester exposure increasing risk
• Findings suggest preventative health measures may need to begin nine months earlier
• Results highlight the need for stronger environmental regulations to protect pregnant women
• Clean air represents a right for future generations that begins before birth

Association analysis of maternal exposure to air pollution during pregnancy and offspring asthma incidence

Thanks a million to our sponsors, SafeTraces. This podcast would not be possible without their support.

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Indoor environmental quality is about more than just air quality – it encompasses everything our sensory systems experience within built environments. This knowledge provides a framework for creating healthier, more human-centered buildings.

• Indoor environmental quality encompasses thermal comfort, acoustics, lighting, vibration, odors, microbiome, and water quality
• Neuroscience can help us understand how our brains respond to environmental stressors even when we don't consciously perceive them
• The disconnect between building sciences and health sciences despite sharing a common focus on human occupants
• Building codes represent minimum standards that unfortunately become maximum efforts in profit-driven construction
• Most buildings under 20,000 square feet have no specialised environmental design input
• Designing for lifetime housing should include environmental considerations for aging and illness
• Performance measurement and accountability could drive significant improvements in building quality
• Museums carefully control environments for artefacts, while homes expose both valuables and people to harmful conditions
• Education about healthy environments could help consumers demand better spaces

Robert Bean LinkedIn

Edifice Complex Podcast

ASHRAE

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Research establishes a direct link between classroom air quality and student attendance rates through a comprehensive study of 144 classrooms across 31 Midwestern elementary schools. The findings provide compelling evidence that improved ventilation and lower PM2.5 levels significantly reduce illness-related absences, even at pollution levels previously considered acceptable.

• For every 1 L/s/person increase in ventilation rate, classrooms experienced 5.6 fewer absence days annually
• Average school ventilation rate (5.5 L/s/person) fell below ASHRAE's recommended standard of 7 L/s/person
• Each 1 μg/m³ increase in indoor PM2.5 corresponded to over 7 additional absence days per classroom per year
• Negative health effects occurred at PM2.5 levels below previous "acceptable" thresholds (mean: 3.6 μg/m³)
• Investing in school HVAC improvements represents a direct intervention to improve student attendance and achievement
• Benefits extend beyond education to public health, academic equity, and economic advantages for families
• Improved ventilation and filtration systems build resilience against future airborne health challenges

Thank you to our sponsors, SafeTraces, for making this podcast possible. See you next week for another One Take!

Associations between illness-related absences and ventilation and indoor
PM2.5 in elementary schools of the Midwestern United States

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Imagine if you could actually see how viruses and bacteria move through the air in a building. That's exactly what Safe Traces technology allows us to do, and the implications for public health and building performance are profound. In this eye-opening conversation, CEO Eric Malmstrom reveals how his company's DNA-tagging technology is transforming our understanding of airborne infection risk.

Born from bioterrorism concerns after 9/11, Safe Traces developed surrogate challenge agents that safely simulate how pathogens behave in real-world environments. By releasing these DNA-tagged particles in buildings and tracking their movement, they can visualize infection pathways that were previously invisible. This empirical approach reveals surprising truths about our buildings: many modern facilities are dramatically overventilated (wasting energy without improving safety), while schools and older buildings often have dangerous gaps in protection that simple interventions could fix.

What makes this conversation particularly valuable is Malmstrom's firsthand experience deploying this technology across diverse environments—from healthcare facilities to schools, offices to prisons. The patterns he's observed challenge conventional wisdom about ventilation rates, air disinfection efficacy, and the relationship between building codes and actual health outcomes. His military background brings a unique perspective on risk management and resilience that enriches the discussion.

The most exciting revelation? We're on the cusp of a revolution in aerobiology technology, with real-time pathogen detection systems just months away from deployment. Combined with growing momentum toward mandatory indoor air quality standards, we may finally be approaching meaningful change in how we design and operate our buildings to protect public health.

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All great companies that share the podcast's passion for better air quality in the built environment. Supporting them helps support the show.

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What happens when the air inside your home is slowly making you sick? For millions of people living in social housing across developing nations, this isn't a hypothetical question—it's daily reality.

A review published in Applied Sciences reveals the shocking reality about indoor air quality in social housing throughout low and middle-income countries. The numbers are staggering: PM2.5 levels reaching 1,360 micrograms per cubic meter during cooking (90 times higher than WHO guidelines), carbon monoxide peaking at 150 parts per million, and formaldehyde concentrations nearly 5 times safe limits.

Behind these statistics are real people—predominantly women and children—suffering disproportionate exposure to harmful pollutants. The culprits? A perfect storm of low-cost building materials that off-gas chemicals, inadequate ventilation, solid fuel use for cooking and heating, and overcrowded living conditions. Even when families move from slums to public housing, pollution levels often remain dangerously high.

The research points to promising solutions through bioclimatic design strategies like cross-ventilation and proper shading, but highlights a critical reality: we can't simply transplant high-income country solutions to these contexts. Effective interventions must consider regional climate differences, cultural practices around cooking and heating, and the economic realities that drive behavior.

Perhaps most importantly, this review reminds us that indoor air quality isn't merely a technical challenge—it's fundamentally about social equity and human rights. As one researcher notes, "When we talk about the right to housing, we must include the right to healthy indoor environments."

Whether you're involved in public health, architecture, international development, or simply care about global health equity, this episode offers vital insights into an overlooked crisis affecting millions worldwide. Subscribe now and join us in exploring how we can ensure that clean air at home becomes a universal right, not a privilege.

A review of indoor air quality in social housing across low and middle income countries

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What distinguishes a truly healthy building from one that simply meets minimum code requirements? In this conversation with Sarah Gudeman, Principal and Practice Lead at Branch Pattern, we explore the critical intersection where engineering expertise meets human-centered design in the pursuit of better built environments.

Sarah brings a refreshingly practical perspective to the often theoretical world of indoor air quality and sustainability. As she explains, "Code compliant is just not illegal. It's the lowest bar we can design to." This fundamental truth underscores the gap between what's legally acceptable and what's truly optimal for human health and wellbeing in our buildings.

The conversation looks into the challenges practitioners face when implementing healthy building strategies. From establishing clear guiding principles at project outset to navigating the complex dynamics of project teams, Sarah reveals how the "peopling" aspect of consulting work often proves more challenging than the technical engineering. Her insights on building psychological safety within teams highlight how admitting knowledge gaps creates space for collaborative problem-solving rather than siloed thinking.

Particularly fascinating is Sarah's discussion of the evolution in air quality monitoring, where point-in-time testing is increasingly supplemented by continuous monitoring systems. Yet this technological advance brings its own challenges: "You've got this dashboard with sensors flashing green and red at you. When do you know who to call and what kind of skill set should they have?" The question cuts to the heart of building operations, where even the most sophisticated technology requires human interpretation and action.

Whether you're a building professional seeking to elevate your approach, a facility manager trying to make sense of air quality data, or simply someone who cares about the spaces where we spend 90% of our lives, this conversation offers valuable perspective on creating environments that truly enhance human health and experience.

Sarah Gudeman - LinkedIn

Branch Pattern

Sarah Gudeman

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Ever wondered why you sometimes struggle to focus when working from home? We dive into fascinating new research that connects the invisible elements of our home environments to how well our brains function during remote work.

This episode explores groundbreaking 2024 research fromAnna s. Young and colleagues who monitored over 200 remote workers for an entire year, tracking how their home's air quality and temperature affected their thinking abilities. The findings reveal a surprising "Goldilocks zone" for optimal brain performance – with temperatures around 23°C (73°F) proving ideal for creative thinking and cognitive speed. Too warm or too cold, and our mental performance measurably declines. We also examine how carbon dioxide levels, even when relatively low compared to crowded offices, might still subtly impact our ability to think clearly and solve problems.

The implications extend far beyond personal comfort. As remote work becomes a permanent fixture in our professional landscape, these findings challenge us to reconsider what makes a truly productive home office environment. It's not just about ergonomic furniture and fast internet – the quality of air you breathe and the temperature you sit in could be making or breaking your workday. Could simple adjustments like opening a window or tweaking your thermostat give you a cognitive edge? Listen to discover practical insights for optimizing your home workspace for better thinking, focus, and creativity. Your brain (and your productivity) will thank you!

Home indoor air quality and cognitive function over one year for people
working remotely during COVID-19

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Check out the Air Quality Matters website for more information, updates and more. And the YouTube Channel

The Air Quality Matters Podcast is brought to you in partnership with.

Eurovent Farmwood 21 Degrees Aereco Aico Ultra Protect InBiot

The One Take Podcast is brought to you in partnership with.

SafeTraces

All great companies that share the podcast's passion for better air quality in the built environment. Supporting them helps support the show.