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2. Air purifier - Wikipedia

   en.wikipedia.org/wiki/Air_purifier

   An air purifier or air cleaner is a device which removes contaminants from the air in a room to improve indoor air quality.These devices are commonly marketed as being beneficial to allergy sufferers and asthmatics, and at reducing or eliminating second-hand tobacco smoke.

3. Positive airway pressure - Wikipedia

   en.wikipedia.org/wiki/Positive_airway_pressure

   Positive airway pressure (PAP) is a mode of respiratory ventilation used in the treatment of sleep apnea.PAP ventilation is also commonly used for those who are critically ill in hospital with respiratory failure, in newborn infants (), and for the prevention and treatment of atelectasis in patients with difficulty taking deep breaths.

4. Air ioniser - Wikipedia

   en.wikipedia.org/wiki/Air_ioniser

   Another study showed that ozone can react with other constituents, namely cleaning agents to increase pollutants such as formaldehyde; this study's objective was testing for health risks associated with indoor use of cleaning products and air fresheners as opposed to adverse health effects of air ionisers.

5. Where to shop today's best sales: Post-Christmas deals ... - AOL

   www.aol.com/lifestyle/where-to-shop-todays-best...

   Listen up: Our senior tech writer, Rick Broida, has spent the past two decades testing (and testing, and re-testing) hundreds of earbuds. So, when he's surprised by just how good a $40 pair ...

6. Indoor air quality - Wikipedia

   en.wikipedia.org/wiki/Indoor_air_quality

   Ventilation with outdoor air containing elevated ozone concentrations may complicate remediation attempts. [69] The WHO standard for ozone concentration is 60 μg/m 3 for long-term exposure and 100 μg/m 3 as the maximum average over an 8-hour period. [29] The EPA standard for ozone concentration is 0.07 ppm average over an 8-hour period. [70]

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   mail.aol.com

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