PMID: 16295271Nov 22, 2005

Potential interference bias in ozone standard compliance monitoring

Journal of the Air & Waste Management Association
Alan R LestonJan Satola


The U.S. Environmental Protection Agency has established a federal reference method (FRM) for ozone (O3) and allowed for designation of federal equivalent methods (FEMs). However, the ethylene-chemiluminescence FRM for O3 has been replaced by the UV photometric FEM by most state and local monitoring agencies because of its relative ease of operation. Accumulating evidence indicates that the FEM is prone to bias under the hot, humid, and stagnant conditions conducive to high O3 formation. This bias may lead to overreporting hourly O3 concentrations by as much as 20-40 ppb. Measurement bias is caused by contamination of the O3 scrubber, a problem that is not detected by dry air calibration. An adequate wet test has not been codified, although a procedure has been proposed for agency consideration. This paper includes documentation of laboratory tests quantifying specific interferant responses, collocated ambient FRM/FEM monitoring results, and smog chamber comparisons of the FRM and FEMs with alternative scrubber designs. As the numbers of reports on monitor interferences have grown, interested parties have called for agency recognition and correction of these biases.


Oct 4, 2011·Environmental Monitoring and Assessment·Marta Doval MiñarroFrancisco J Marzal Martínez
Aug 10, 2013·Journal of the Air & Waste Management Association·Will M OllisonChester W Spicer
Dec 1, 1972·British Journal of Haematology·P B KernoffF W Wright
Apr 1, 1972·British Journal of Haematology·H H Knox-MacaulayM J Brown
May 1, 1972·British Journal of Haematology·W L MarshE P Scott
Oct 1, 1972·British Journal of Haematology·J D ZervasM C Israëls
Jun 1, 1973·British Journal of Haematology·P Lalezari
Jan 1, 1975·British Journal of Haematology·M L BeckW L Bayer
Jun 1, 1978·British Journal of Haematology·S M Worlledge
Mar 24, 2017·Journal of the Air & Waste Management Association·George M HidyJ G Watson

Related Concepts

Air Pollutants, Occupational
Environmental Monitoring
Oxidants, Photochemical
Ground Level Ozone
Black Light, Ultraviolet
United States Environmental Protection Agency
Truncation Biases

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