Each of us once in life wanted to leave the stuffy apartment and to go somewhere outside the city, away from the smog and the exhaust to breath with pure sea or mountain air. Even in perfectly clean apartment with a daily wet cleaning and airing we still suffocate and feel that we do not have that pure air. Why is this happening? There are particles in the air which are called air ions, positively and negatively charged. They are ranked as light, medium, and heavy. The...