(1) What is an air ion?
An air ion is a positively or negatively charged tiny particle in the air. (e.g. oxygen molecule) A negative ion possesses the same amount of electric charge as an electron. (2) How is an air ion created? Ions charged positively are positive ions and those charged negatively are negative ions. Generally, free-floating electrons are released into the air and they collide/stick with/to gaseous molecules (e.g. oxygen molecule) to form negative ions or negative ion molecules.
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