Air purifier hay fever: how to reduce symptoms indoors

For millions of Dutch people, hay fever is a recurring annual problem. Red eyes, a runny nose, sneezing, and fatigue make spring and summer a torment for many. An air purifier does not offer a cure, but it can drastically reduce symptoms indoors.

How exactly does hay fever work?

Hay fever is an allergic reaction to pollen — microscopic particles that plants, trees, and grasses release during their flowering period. When pollen grains come into contact with your mucous membranes (nose, eyes, throat), your immune system reacts with a hypersensitivity reaction: histamine is released, leading to the familiar symptoms.

Outdoors, pollen can be difficult to avoid. But indoors, you have control over the air quality — and a good air purifier helps tremendously with that.

Which filter best filters pollen?

For hay fever, a HEPA 13 filter is the gold standard. A HEPA 13 filter captures 99.95% of all particles smaller than 0.3 microns. Pollen grains are on average 10 to 100 microns in size — and are therefore almost completely captured.

When is the pollen count highest?

The pollen season in the Netherlands generally runs from February to September, depending on the crop:

• Alder and hazel — February to April
• Birch — April to May (heaviest season for many people)
• Grasses — May to August
• Mugwort — July to September

On warm, dry, and windy days, the pollen count is highest. It is precisely on these days that it pays to keep windows closed and your air purifier running continuously.

How much symptom reduction can you expect?

BLANC SQUARE customers with hay fever report an average reduction of 50 to 75% of their indoor symptoms after using the BLANC SQUARE Air Purifier Pro. The effect is strongest in the bedroom, where you spend the most hours.

Tips for optimal use with hay fever

• Turn on the air purifier before entering the bedroom
• Keep windows and doors closed as much as possible on high pollen days
• Shower in the evening before going to bed to remove pollen from your hair and skin
• Change filters on time — a saturated filter purifies less effectively

Air Purifier Pro vs Pro XL: what is suitable for hay fever?

For the bedroom (up to 35 m²), the Air Purifier Pro is the right choice. For the living room or open living spaces up to 90 m², the Air Purifier Pro XL is more suitable.

Frequently asked questions

Does an air purifier also help against asthma?
Yes. Asthma is often triggered by the same allergens as hay fever: pollen, dust mites, and mold spores. A HEPA 13 air purifier removes these triggers from the air. Always consult your doctor for personal advice on asthma.

Should I leave the air purifier on all day during pollen season?
For the best effect: yes. In automatic mode, the air purifier adjusts its intensity to the measured air quality.

How long does it take before I notice an effect?
Most users notice a difference in their indoor air quality within 24 to 48 hours. Noticeably fewer hay fever symptoms at night are reported within 2 to 3 nights of use.