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Children which suffer from a nasal allergy because of the dust,dust mite,and the pm2.5 and so on.And the nighty percent of the allergens is dust mite.Among of these,the pm2.5 will cause other cancers.The air purifier is designed for babies and when the baby is sleeping,it can be worn on the quilt.Even go out or at home it can be worn on the clothes.It is effective to filter out the pm2.5 and varieties of allergens and it can even detect the concertration,so that parents can easy to know whether it is suitable to go out or not.