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This type of O3 analyzer was introduced into monitoring networks in the Nineteen Eighties and has since turn out to be the predominant type of method used because of its all-optoelectronic design and its ease of set up vintage sea turtle company bath soap wash your paws poster  and operation. While the EPA agrees with the potential good thing about extending the supply of PAMS measurements exterior of the present season, we also thought of the burden of requiring

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beforehand for SO2 and CO analyzers. Modest adjustments proposed for Table B-three would add new interferent take a look at concentrations particularly for NO-CL O3 analyzers, which embody a check for NO2 interference. In close association with the proposed O3 FRM, the EPA also proposed modifications to the related analyzer efficiency requirements for designation of FRMs and FEMs for O3, as set forth in 40 CFR half fifty three. These adjustments were largely confined to Table B-1, which specifies performance requirements for FRM and FEM analyzers for SO2, CO, O3, and NO2, and to Table B-3, which specifies check concentrations for vintage sea turtle company bath soap wash your paws poster  the assorted interfering agent tests. Minor modifications had been also proposed for Figure B-5 and the final provisions in subpart A of part fifty three. All of these proposed adjustments are described and mentioned extra totally within the preamble to the proposal for this action (79 FR ). FRM. The EPA will await the results of additional studies figuring out the worth of the O3 cross part at 254 nm before making a change to the calibration procedures and won’t finalize adjustments to the calibration procedures in this final rule. As noted in the proposal, there may be substantial similarity between the brand new and beforehand present FRM measurement methods, and comparative field data show excellent settlement between ambient O3 measurements made with the 2 strategies (U.S. EPA 2014f).

Therefore, the EPA believes that there will be no vital influence on the comparability between present ambient O3 monitoring knowledge based on the original ET-CL methodology and new monitoring data that could be based on the NO-CL methodology. The present O3 FRM specifies a measurement precept based mostly on quantitative measurement of chemiluminescence from the response of ambient O3 with ethylene (ET-CL). Ozone analyzers based mostly on this FRM precept have been once widely deployed in monitoring networks, however now they are not used for routine O3 area monitoring as a result of readily available UV-type FEMs are considerably less difficult to install and operate. In fact, the extent of the utilization of UV-kind FEMs over FRMs for O3 monitoring is such that FRM analyzers have now turn out to be commercially unavailable. The final new commercial FRM analyzer was designated by the EPA in 1979. The current listing of all permitted FRMs and FEMs capable of providing ambient O3 data for use in NAAQS attainment decisions may be found on the EPA’s Web website and in the docket for this action (U.S. EPA, 2014e). However, that record does not indicate whether or not every listed method is still commercially out there. To be used in a dedication of compliance with the O3 NAAQS, ambient O3 monitoring data should be obtained using either a FRM or a FEM, as outlined in elements 50 and fifty three. For O3, nearly all the monitoring methods presently used by state and native monitoring companies are FEM continuous analyzers that utilize an alternative measurement precept based on quantitative measurement of the absorption of UV mild by O3.

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