Methods and devices for in situ measurement of tropospheric ozone: chemical, electrochemical, chemiluminescent, optical, colorimetrical, and some others are considered. Ozone measurements with the use of semiconductor metal-oxide film sensors and passive ozone samplers for ozone dose determination are described. Remote methods of ozone measurement are also discussed: optical absorption spectroscopy; laser, and satellite ones. Methods of determination of vertical ozone distribution in the troposphere with the use of ozonesondes, aircrafts, and lidar sensing are analyzed. Different devices and systems are compared. Data on ozone generators are presented.