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Entries with tag indoor air quality .

The hidden chemicals in the indoor air we breathe: understanding VOCs

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Most people think of air pollution as something that happens outside, near factories, highways, or in big cities. But here’s the surprising truth: we spend around 90% of our time indoors, and the air inside our homes, offices, or classrooms can often be 2 to 5 times more polluted than outdoor air. From sleeping and studying to cooking and working, nearly every part of modern life happens...
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Impact of air conditioning on relative humidity

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In buildings, especially those intended for commercial use, to achieve the recommended indoor air quality levels , the inside air needs to be diluted with air-conditioned and filtered air from the outside, as it contains pollutants and bioeffluents. Take, for example, a hospital in winter; for the sake of simplicity, only fresh outside air is used - air that is very cold and humid (point...
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Breathing easy at work: a case study

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In the post-pandemic world, indoor air quality (IAQ) is no longer a silent factor in workplace well-being; it’s front and centre in discussions about employee health, cognitive function, and even infection control. As businesses adapt to evolving occupational health standards and employee expectations, the demand for healthier indoor environments has surged. A recent case study was...
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The indoor air you sleep in matters

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Do you often feel drowsy in the morning, even after a whole night’s sleep?  Does it seem like you slept enough but you still wake up not feeling rested?  You may be surprised how much your bedroom’s air quality can affect your sleep and how you feel the next day. Sleep is a fundamental need that restores the body and mind, alleviating fatigue, replenishing energy...
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Controlling CO2 concentration with mechanical ventilation

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All heterotrophic organisms emit CO 2 as a waste product of their metabolism. Ventilation units, equipped with adequate monitoring systems, can reduce the concentration of CO 2 and, consequently, that of all bio-effluents, including viruses. CO 2 and heterotrophic organisms   All heterotrophic organisms, i.e. those incapable of autonomously synthesising all their own...
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Particulate matter: health and policy

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Outdoor air pollution is one of the most pressing environmental and public health challenges of the modern era. It refers to the presence of harmful substances in the atmosphere, including gases, particulate matter , and biological molecules, that can negatively impact human health, ecosystems, and the climate. Sources of air pollution range from natural phenomena such as volcanic eruptions...
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Pollutants and CO2: air quality indicators

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In indoor spaces without adequate air change, high concentrations of respiratory particles, pollutants and CO 2  may accumulate. It is essential to monitor these parameters in order to evaluate and subsequently improve IAQ in buildings. Parameters to be monitored to ensure indoor air quality   The Air Quality Guidelines AQG, published in 2021 by the WHO, list six...
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Airborne particle classification: size and type

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The air we breathe every day is not just a mixture of gases, indeed it also contains suspended solid and/or liquid substances . The aerodynamic diameter of these particles determines how far they may penetrate into our respiratory system. Compared to outdoor environments, in closed spaces it is much easier to breathe in respiratory particles that can carry viruses and bacteria . This article...
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Raul Simonetti
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Date: 12/18/25
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