Figure 1. (Color online) Modified Dylos DC1700 Air Quality Monitor. Coin included to show scale

From

Developing and Selecting Auditory Warnings for a Real-Time Behavioral Intervention

John Bellettiere, Suzanne C. Hughes, Sandy Liles, Marie Boman-Davis, Neil E. Klepeis, Elaine Blumberg, Jeff Mills, Vincent Berardi, Saori Obayashi, T. Tracy Allen, Melbourne F. Hovell

American Journal of Public Health Research. 2014, 2(6), 232-238 doi:10.12691/ajphr-2-6-3