Thunderstorm, lightning, water fall are the natural phenomena that introduces Negative Air Ions in the surroundings.These NAI destroy many air pollutants and thereby gives us a sense of well being. Due to man made activities and industrial revolution the concentration of positive ions increases causing air pollution. Fog/Dust/Smoke/Pollen/Chemical Fumes/Bio-aerosols are the particulate responsible for Air Quality. This book explains the removal of these aerosols by using simple and economic Air Ion Generators.It focuses on construction of the device with details of the electronic components. The device can be used to generate positive and negative air ions. The efficiency of the NAI generator instrument is tested on fog, smoke and other particulates in the indoors.Results show the removal efficiency to be 90-96% and increased visibility. Experiments proved to be fruitful inside confined spaces such as residential rooms, offices and also in poultry farms, green houses.