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Why Allergists Recommend Opening Windows Between 6 a.m. and 8 a.m., at the End of March

Summary by Maison & Travaux
Eyes scratching as soon as you wake up, nose running while the windows just come to be opened: for pollen allergies, spring often looks like a battle lost in advance. Yet many think it is right to aerate their homes at length each morning, persuaded to purify the indoor air while they let in an invisible cloud of grass pollen. What the air quality specialists show is that the concentration of outdoor pollen changes radically over the hours.
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Eyes scratching as soon as you wake up, nose running while the windows just come to be opened: for pollen allergies, spring often looks like a battle lost in advance. Yet many think it is right to aerate their homes at length each morning, persuaded to purify the indoor air while they let in an invisible cloud of grass pollen. What the air quality specialists show is that the concentration of outdoor pollen changes radically over the hours.

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Maison & Travaux broke the news in on Tuesday, March 24, 2026.
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