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Wearable air purifiers find takers, but experts sound caution: ‘Not effective outdoors’
An AQI of 301–400 is classified as ‘very poor’, while 401–500 falls into the ‘severe’ category.
As wearable air purifiers find takers, experts sound caution
An AQI of 301–400 is classified as ‘very poor’, while 401–500 falls into the ‘severe’ category.
