How effective ventilation can relieve asthma, allergies and hay fever

Damp caused by poor ventilation is a breeding ground for dust mites that can cause asthma.

Airborne allergens, such as pollen, if not filtered out of the air can cause allergies including hay fever.

Anything that irritates the airways and brings on the symptoms of asthma is a trigger. Just like the symptoms, these can differ from person to person and some sufferers may have several triggers. Common triggers include house dust mites, animal fur, pollen, tobacco smoke, mould and fungi.

Allergies occur when your immune system reacts to a foreign substance such as pollen, bee venom or pet dander, or a food that doesn't cause a reaction in most people.

Dust mites don’t bite but they are allergenic and can trigger asthma. People are often allergic or have an asthmatic reaction to the proteins found in their droppings but they can also be allergic to the body parts of the dust mite.

Dust mite waste can be a trigger asthma. Effective ventilation can lower levels of humidity and reduce damp conditions in which dust mites thrive.

Ventilation can reduce relative humidity and damp. This can significantly reduce dust mite populations which can trigger for allergies. A filtration ventilation system can reduce pollen levels which cause hay fever.

People who suffer from allergies are often more prone to the effects of mould spores in their homes. Common symptoms include sore throats, a dry cough and shortness of breath.