Search

The article presents a study which compares the efficiency of different techniques using various instruments in measuring interferences of commercial nitrogen dioxide (NO2) in the urban atmosphere and in a smog chamber. Chemiluminescence instruments with molybdenum or photolytic converters, Luminol based instrument and a proposed NO 2 Long Path Absorption Photometer (LOPAP) were compared with spectroscopic techniques. The methods and results of the study are discussed.

The article focuses on the development of a Long Path Absorption Photometer (LOPAP) instrument for the detection of NO2 in the atmosphere. The instrument is considered more sensitive than known instruments as it has an accuracy of 10 percent and a precision of 0.5 percent for three minutes time resolution. It is also deemed easier to apply than other methods. Its use is validated by intercomparison with chemiluminescence instrument with photolytic NO2 converter.