A comparison of EPA and en requirements for nitrogen oxide chemiluminescence analyzers

Abstract

Nitrogen oxides analyzers currently used for measuring air quality in European countries meet the standard ISO 7996:1985, which does not establish any special feature for such equipment, except the analytical technique implemented. Nevertheless, most of them are designated as Reference methods by the Environmental Protection Agency of the United States. Future European legislation in this matter establishes as reference method for measuring these pollutants that described in EN 14211:2005, where a number of tests for chemiluminescence analyzers are described. In this paper, we compare the requirements of both documents, evaluating the suitability of each and their approach.