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For Seasonal Affective Disorder (SAD), a randomized controlled trial (RCT) comparing high (4.5x10 14 ions/second) and low (1.7x10 11 ions/second) flow rate negative air ionization with bright light therapy found that the post-treatment improvement percentage was 57.1% for bright light, 47.9% for high-density ions and 22.7% for low-density ions. [8]
Compared with the negative air ions produced in nature, although artificial methods can produce high levels of negative air ions, there are specific differences in the types and concentrations of negative air ions, which makes the negative air ions produced by artificial methods may not achieve the excellent environmental health effects of ...
Ionisers tend to produce negative ions since these are supposed to have beneficial health effects. Even the best ionisers will also produce a small amount of ozone—triatomic oxygen, O 3 —which is unwanted. Ozone generators are optimised to attract an extra oxygen ion to an O 2 molecule, using either a corona discharge tube or UV light. [8]
Shinrin-yoku is linked to a recharging of positive energy, higher energy levels, and a purification of negative thoughts. Breathing the air in a forest environment maximizes the intake of negative ions (which are invisible molecules in the air) that help to increase health, mood, mental clarity, cognitive functioning, and energy levels. [14]
The two most prevalent ions in seawater are chloride and sodium. Together, they make up around 85 per cent of all dissolved ions in the ocean. Magnesium and sulfate ions make up most of the rest. Salinity varies with temperature, evaporation, and precipitation. It is generally low at the equator and poles, and high at mid-latitudes. [12]
Increasing carbon dioxide levels can reduce coral growth rates from 9 to 56% due to the lack of available carbonate ions needed for the calcification process. [10] [11] Other calcifying organisms, such as bivalves and gastropods, experience negative effects due to ocean acidification as well. [10]
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Sea air has traditionally been thought to offer health benefits associated with its unique odor, which Victorians attributed to ozone.More recently, it has been determined that the chemical responsible for much of the odor in air along certain seashores is dimethyl sulfide, released by microbes.