Potential Interference Bias in Ozone Standard Compliance Monitoring.
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| Title: | Potential Interference Bias in Ozone Standard Compliance Monitoring. |
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| Authors: | Leston, Alan R.1 aleston@hotmail.com, Ollison, Will M.2, Spicer, Chester W.3, Satola, Jan3 |
| Source: | Journal of the Air & Waste Management Association (Air & Waste Management Association). Oct2005, Vol. 55 Issue 10, p1464-1472. 9p. 1 Chart, 8 Graphs. |
| Subject Terms: | *Ozone, *Air pollution monitoring, *Air quality |
| Geographic Terms: | United States |
| Company/Entity: | United States. Environmental Protection Agency |
| Abstract: | 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 However, the ethylene-chemiluminescence FRM for O3 has been replaced by the UV photometric FEM by most state and local monitoring agencies because of its relative ease of operation.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. [ABSTRACT FROM AUTHOR] |
| Copyright of Journal of the Air & Waste Management Association (Air & Waste Management Association) is the property of Air & Waste Management Association and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) | |
| Database: | GreenFILE |
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| Abstract: | 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. [ABSTRACT FROM AUTHOR] |
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| ISSN: | 10962247 |
| DOI: | 10.1080/10473289.2005.10464749 |
