When we think about pollution, we often imagine city traffic or industrial emissions. In reality, the air we breathe indoors can also be more polluted than outdoor air. We spend a large part of the day in enclosed spaces: homes, offices, schools and shops. Fine particles, carbon dioxide, carbon monoxide and nitrogen oxides can build up in these environments, affecting everyday wellbeing and, over time, respiratory health.
The main sources of indoor pollution
Fine particles (PM10 and PM2.5) can come from traffic, cooking, stoves, fireplaces, cigarette smoke and ordinary household dust. The smallest particles, known as PM2.5, can reach the deepest parts of the lungs.
CO₂ is naturally produced by human breathing. It is not toxic at normal concentrations, but when a room is poorly ventilated it can cause tiredness, drowsiness and difficulty concentrating.
Carbon monoxide (CO), on the other hand, is one of the most dangerous gases: it is invisible, odourless and can result from incomplete combustion in faulty boilers, stoves or fireplaces. Even low concentrations can be very harmful.
Nitrogen oxides (NOx), especially nitrogen dioxide (NO₂), mainly come from gas cookers and urban pollution entering the home.
Effects on health and lung diseases
Poor indoor air quality can worsen asthma, chronic bronchitis and chronic obstructive pulmonary disease (COPD). Fine particles irritate the airways and increase lung inflammation. In children and elderly people, the effects can be even more significant because the respiratory system is more vulnerable. Respiratory infections can also spread more easily in poorly ventilated indoor spaces. Carbon monoxide represents an immediate risk: it can cause headaches, nausea, dizziness and, in the most severe cases, loss of consciousness. PM2.5 does not only affect the lungs: once it enters the bloodstream, it can increase cardiovascular risk and contribute to chronic inflammatory conditions.
Filtration systems: which ones really work?
There is no single system capable of removing every pollutant. Each technology has a specific function. HEPA filters are very effective against fine particles, allergens, pollen and aerosols. H13 models can capture up to 99.95% of ultrafine particles. However, they do not remove gases such as CO₂ or CO.
Activated carbon filters are mainly used for odours, fumes and volatile organic compounds. They can reduce some NOx, but they have limited effectiveness against CO₂ and carbon monoxide.
Controlled Mechanical Ventilation (CMV) is one of the most effective systems for improving air exchange. It reduces CO₂, humidity and pollutant build-up, helping to maintain a healthier environment. Ionisation or plasma systems can also help reduce particulate matter, but they must be certified to avoid producing ozone or other irritating substances.
The importance of monitoring
Today, home sensors can monitor CO₂, PM2.5, carbon monoxide and NO₂ levels in real time. Monitoring these parameters helps you understand when to ventilate rooms and when to replace filters.
Carbon monoxide detectors are especially important in homes with stoves, boilers or fireplaces.
Recommended Amazon products
If you want to compare different solutions for improving indoor air quality, here are some air purifiers and monitoring tools available on Amazon.
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Conclusion
Indoor air quality is essential for everyday health and comfort. Fine particles, CO₂ and toxic gases can accumulate without us noticing, affecting breathing, concentration and overall wellbeing.
The most effective approach is to combine good ventilation with suitable filtration systems and continuous monitoring. Investing in air quality means protecting the health of the whole family.
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