NDLI: Assessment of uncertainty of NO<sub>2</sub> measurements by the chemiluminescence method and discussion of the quality objective of the NO<sub>2</sub> European Directive

Content Provider	Royal Society of Chemistry (RSC)
Author	Lagler, Fritz Rembges, Diana Gerboles, Michel Brun, Claude
Copyright Year	2003
Abstract	Hereafter, an assessment of the ability of the chemiluminescence method to measure ambient NO2 with an accuracy within 15%, as requested by the data quality objective of European directive 1999/30/CE, is presented. In general, uncertainty is evaluated using the response to reference materials or by means of inter-comparisons used to determine some statistics like repeatability, reproducibility and calibration bias. These are incomplete approaches and the method of the Guide to the Expression of Uncertainty in Measurement, advised by the Directive, should be preferred. In fact, even if it requires a large data set, it allows the relative influence of all possible sources of uncertainty to be studied. The extent of NO2 uncertainty is mainly dependent on the level of NO. It is decreased by NOx and the correlation between NOx and NO. Furthermore, the uncertainty budget reveals that the contribution of accuracy of calibration standard, linearity, converter efficiency and drift of the analyser between calibration checks to the overall uncertainty is less important than the contribution of interference, mainly humidity and PAN in rural areas. The relative expanded uncertainty of the NO2 hourly average exceeds 30% for NO2 concentrations lower than 40 µg m−3. Nevertheless, the data quality objective of 15% is reached for 200 µg m−3, the hourly limit value of the European directive. On the contrary, at the limit value on the annual average, 40 µg m−3, the data quality objective is not met if NO is higher than 100 µg m−3. However, the data quality objective could be reached by correcting the measurements with the bias due to interference.
Starting Page	529
Ending Page	540
Page Count	12
File Format	HTM / HTML PDF
ISSN	14640325
Volume Number	5
Issue Number	4
Journal	Journal of Environmental Monitoring
DOI	10.1039/b302358c
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Chemiluminescence NOx Relative humidity
Content Type	Text
Resource Type	Article
Subject	Public Health, Environmental and Occupational Health Management, Monitoring, Policy and Law

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