Dielectric barrier discharge (DBD) is one of notable atmospheric pressure non–thermal plasma (NTP) technologies.  Although DBDs have being widely used on industrial scale more than one hundred years, their applications on air pollution control are relatively late after 1990.  Numerous studies have indicated that NTPs are capable of removing air pollutants such as volatile organic compounds, acid gases, greenhouse gases, perfluorocarbons, and odor–causing substances.  The basic principle is that energetic electrons generated by plasmas are highly effective in decomposing of gas molecules of air pollutants.  Compared with traditional air pollution control technologies, DBDs are of many advantages, e.g., spatially compact, low running cost, and simultaneous removal of multi–pollutants.  This paper introduces the development of DBD reactors from the traditional plate and coaxial types to the advanced integration systems that combine DBDs with either catalysis or wet scrubbing.