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Allergens in the indoor environment can come from house dust mites, pets, mould and pollen, among other things. Allergens are substances that can cause allergic reactions. An allergic reaction occurs when the body's immune system has a hypersensitive response to certain substances (allergens)....

A causes air to move, this creates a cooling effect because a powerful flow of air is created. This is similar to a breeze during a hot, summer day. As air flows past your skin, the sweat on your body evaporates faster, making it feel cooler. ...

Humidity is crucial for an optimal indoor climate. When the air in indoor spaces is too humid, quality of life can be severely affected by mould spores, allergens and respiratory problems. Daily household activities such as cooking, taking a shower or using a dishwasher or washing machine create moisture. If this moisture cannot be removed properly, it can cause humidity to rise far above the norm...

A new human coronavirus called SARS-CoV-2 first appeared in Wuhan, China at the end of 2019 and has since caused a global pandemic. The new SARS-CoV-2 coronavirus is the pathogen of COVID-19: an infectious disease caused by this new coronavirus. The disease causes respiratory complaints with symptoms such as cold-like symptoms, coughing, fever and (in more serious cases) respiratory problems....