Results from the August 1993 DOAS evaluation in Baytown, Texas
- ManTech Environmental Technology Inc., Research Triangle Park, NC (United States)
- Environmental Protection Agency, Research Triangle Park, NC (United States)
An EPA-sponsored field study to further evaluate DOAS technology took place in Baytown, Texas in August, 1993. The goals of the study were to evaluate calibration and audit procedures and to further evaluate DOAS performance in an area with potentially high pollution levels. The gases being measured were ozone, nitrogen dioxide, and sulfur dioxide. Two separate DOAS systems were operated simultaneously using nearly identical air paths. Two sets of conventional point measurement monitors were operated at the site to provide EPA-approved reference concentration measurements. Hourly-average concentration measurements were recorded from all measurement systems. Intercomparisons of the various data sets have been carried out. Excellent agreement between the two DOAS systems and between the two point measurement systems was seen. The agreement between the DOAS and point measurement systems varied from excellent to poor, depending upon the gas being measured. The quality of the correlations between the two fundamentally different techniques was dependent upon the homogeneity of the air mass. When nearby sources were present, the pollutant plume at the monitoring site was narrow enough to differentially affect the two types of monitors. Thus the different techniques measured different concentrations and the data correlations were degraded.
- OSTI ID:
- 197513
- Report Number(s):
- CONF-9405167--
- Country of Publication:
- United States
- Language:
- English
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