This book discusses the development, types and application principles of
portable air purifiers in China. It analyzes the theoretical
characteristics of air purifiers under various operational conditions,
and points out that the term "Clean Air Delivery Rate" cannot be used to
precisely reflect the problems that occur under various operational
conditions. By comparing theoretical and measured data, it highlights
the mainfeatures of air purifiers and key points in the design process
for different applications. Calculation methods for the indoor particle
concentration and the self-purification time are also provided. The book
describes the conditions for window opening in smog and for selecting
air purifiers, and proposes a newmethod for improvingtheir measurement.
In closing, it includes a new assessment index.