EVALUATION OF NO2 MEASUREMENT METHODS FOR INDOOR AIR-QUALITY APPLICATIONS

Measurement of nitrogen dioxide (NO2) and other oxidized nitrogen comp ounds in indoor environments can present some measurement difficulties not normally encountered in sampling outdoor air. This paper examines three methods that are in current use for monitoring indoor nitrogen dioxide. The methods include ozone-based and luminol-based chemilumine scence, and an electrochemical technique. We have examined these metho ds for accuracy, linear dynamic range, and interferences. Each of the methods was subject to interference. For indoor measurements, nitrous acid probably represents the most significant interference for the ozo ne-based chemiluminescence and electrochemical monitors.