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The measurement system is calibrated by referencing the instrumental chemiluminescence measurements to licensed O3 standard concentrations generated in a dynamic flow system and assayed by photometry to be traceable to a National Institute of Standards rooster american flag all over print flag and Technology standard reference photometer for O3 . Submission of demonstrations. Except as allowed underneath paragraph of this part, a State that has flagged knowledge as being due to an exceptional occasion and is

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hour average O3 concentrations (i.e., zero. ppm, truncated to 0.073 ppm) is bigger than 0.070 ppm, despite the fact that the annual knowledge completeness is less than seventy five% in one year and the 3-year common information completeness is less than ninety% (i.e., design worth would not in any other case be considered valid). As shown in Example 1, this website meets the first and secondary O3 NAAQS as a result of the three-12 months common of the annual fourth-highest day by day maximum eight-hour average O3 concentrations (i.e., zero. ppm, truncated to zero.065 ppm) is less than or equal to zero.070 ppm. The minimum rooster american flag all over print flag knowledge completeness requirements are also met (i.e., design value is taken into account legitimate) as a result of the common p.c of days within the O3 monitoring season with valid ambient monitoring data is greater than ninety%, and no single 12 months has less than 75% information completeness. Site refers to an ambient O3 air high quality monitoring website. O3monitoring season refers to the span of time within a 12 months when particular person states are required to measure ambient O3 concentrations, as listed in Appendix D to half 58 of this chapter. Boylan, P., Helmig, D., and Park, J.H. Meas. Tech. 7, . four.5.5.6 Plot the O3 analyzer responses (vertical or Y-axis) versus the corresponding O3 normal concentrations (horizontal or X-axis). Compute the linear regression slope and intercept and plot the regression line to confirm that no level deviates from this line by more than 2 % of the utmost focus tested.

General operation. The calibration photometer have to be dedicated exclusively to make use of as a calibration commonplace. It must always be used with clean, filtered calibration gases, and by no means used for ambient air sampling. A variety of advantages are realized by finding the calibration photometer in a clear laboratory where it may be stationary, protected against the physical shock of transportation, operated by a responsible analyst, and used as a standard standard for all field calibrations by way of transfer requirements.The zero air should be freed from contaminants which would cause a detectable response from the O3 analyzer, and it have to be free of NO, C2 H4, and different species which react with O3. A procedure for generating appropriate zero air is given in Reference As shown in Figure 2, the zero air equipped to the photometer cell for the I0 reference measurement must be derived from the identical source because the zero air When using the photometer to certify a switch standard having its own source of O3, see Reference 12 for steering on meeting this requirement. three Apparatus. Figure 2 reveals a generally used configuration and serves for example the calibration process, which follows. Other configurations could require acceptable variations in the procedural steps. Additional data relating to the assembly of a UV photometric calibration equipment is given in Reference thirteen. For certification of switch standards which give their very own source of O3, the switch standard could substitute the O3 generator and probably different components shown in Figure 2; see Reference 12 for guidance.2 Applicability. This procedure is applicable to the calibration of ambient air O3 analyzers, both instantly or by means of a transfer standard licensed by this process. Transfer standards should meet the requirements and specs set forth in Reference

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