scope:

This standard describes: the determination of the ozone concentration in the air for calibration, starting from a known concentration of nitrogen monoxide, the determination of the ozone concentration in the air for calibration purpose starting from a known concentration of nitrogen dioxide; - the determination of the concentration of nitrogen monoxide in air for calibration purposes, starting from a known concentration of nitrogen dioxide; the preparation of nitrogen dioxide calibration gas, starting from a known concentration of nitrogen monoxide. The standard applies to the calibration of measuring methods for nitrogen monoxide, nitrogen dioxide and ozone in air in concentration from 50 to 200 µ g/3 .