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By submitting your email, you agree to our Terms and Privacy Notice. Jump to navigation Jump to search ION is mostly used on air conditioning products. This article is about the air purifier. For the controversial psychiatric treatment, see Negative air ionization therapy. This photo shows the sterilisation effects of negative air ionization on a chamber aerosolised with Salmonella enteritidis.

Photo taken in a lab operated by the United States Department of Agriculture. In 1918 Alexander Chizhevsky had created the first air ioniser for ion therapy. It was originally used for animal health in agriculture. Air ionisers are used in air purifiers to remove particles from air. Airborne particles become charged as they attract charged ions from the ioniser by electrostatic attraction. A 2018 review found that negative air ions are highly effective in removing particulate matter from air. There are two types of ionic air purifiers, the fanless and fan base ionizers.

The fan base ionizer uses its fan to circulate air around the room rapidly, but it is noisier and consumes more energy, while the fanless types distribute air slowly, taking a longer time to purify air, but are noiseless and more energy efficient. Since 2010, all portable indoor air cleaning devices sold to people or businesses in California are required to be certified by CARB. As of October 2020, electronic in-duct air cleaning devices are also subject to the regulation. To be certified, all air cleaners must be tested for electrical safety. Electronic air cleaners must also be tested for ozone emissions and meet an ozone emission concentration limit of 0. Ionisers are distinct from ozone generators, although both devices operate in a similar way.

At concentrations that do not exceed public health standards, ozone has been found to have little potential to remove indoor air contaminants. At high concentrations ozone can be toxic to air-borne bacteria, and may destroy or kill these sometimes infectious organisms. A 2013 comprehensive review of 80 years of research into air ions and respiratory function outcomes found that there was no clear support for any beneficial role in respiratory function, nor evidence for significant detrimental effect. In conclusion, “exposure to negative or positive air ions does not appear to play an appreciable role in respiratory function. There is weak evidence that negative air ionization is associated with lower depression scores, particularly at the highest exposure level.

No consistent influence of positive or negative air ionization on anxiety, mood, relaxation, sleep, and personal comfort measures was observed. Studies have been carried out on negative ion generators. One study shows that the ozone generated can exceed guidelines in small, non ventilated areas. October 2003 that air ionisers do not perform to high enough standards compared to conventional HEPA filters. The exception was a combination unit that used a fan to move air while ionizing it. The United States District Court for the Northern District of California dismissed the case, reasoning that the Sharper Image had failed to demonstrate that it could prove any of the statements made by Consumer Reports were false.

Master and Woland: In 120th Birthday Anniversary of Aleksandr Leonidovich Chizhevsky”. Air ionisers wipe out hospital infections”. Negative Air Ions and Their Effects on Human Health and Air Quality Improvement”. List of CARB-Certified Air Cleaning Devices”. Production of isotopically heavy ozone by ultraviolet light photolysis of O2″. Code of Federal Regulations Title 21″. Ozone generators generate prison terms for couple”.

Ozone: Good Up High, Bad Nearby”. Centers for Disease Control and Prevention. Air ions and respiratory function outcomes: a comprehensive review”. Journal of Negative Results in Biomedicine. Air ions and mood outcomes: a review and meta-analysis”. 525,000 to end lawsuit against CU”.

Wikimedia Commons has media related to ionisers. Look up ioniser in Wiktionary, the free dictionary. Do “corona discharge” devices alleviate asthma? Microsoft’s Activision Blizzard deal is key to the company’s mobile gaming efforts. Microsoft is quietly building a mobile Xbox store that will rely on Activision and King games.