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PM 2.5 Continuous (FEM / ARM) Data Handling - Issues & Intentions. National Air Quality Conference, Portland Oregon, April 6, 2008. Three important take-home messages!. Questions of the Day What key provisions of the monitoring regulations impact continuous PM 2.5 monitoring?

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pm 2 5 continuous fem arm data handling issues intentions

PM2.5 Continuous (FEM / ARM) Data Handling - Issues & Intentions

National Air Quality Conference, Portland Oregon, April 6, 2008

slide2

Three important take-home messages!

Questions of the Day

  • What key provisions of the monitoring regulations impact continuous PM2.5 monitoring?
  • What flexibility will EPA provide in the reporting and use of data from newly deployed FEM monitors?
  • How will the data from FEM’s and ARM’s be used to calculate design values?
  • What are the recommended best practices for operating and maintaining continuous PM2.5 monitors?
  • How can continuous PM2.5 monitors be used in support of emergencies and natural events?
  • How will State/local/Tribal agencies utilize approved monitors in their networks?
  • OAQPS is allowing S/L/T’s an opportunity to ‘reality test’ their continuous FEM’s before making them ‘official’ for NAAQS usage.
  • Valid FEM data produced/reported thereafter (and also ARM data) must be used for NAAQS applications
  • OAQPS proposes a “composite site” aggregation approach tweak (when a filter-based FRM is collocated with a continuous FEM/ARM) that should minimize S/L/T consternation
slide3

OAQPS is allowing S/L/T’s an opportunity to ‘reality test’ their continuous FEM’s before making them ‘official’ for NAAQS usage. (I.e., Shielding ‘FEM’ data from NAAQS usage)

Double safeguard:

  • SPM classification – Per CFR, SPM data are immune from NAAQS comparisons for < 2 years
  • Use of parameter 88501 or 88502 – Only data for parameter 88101 are used for NAAQS (design value) purposes
slide4

OAQPS is allowing S/L/T’s an opportunity to ‘reality test’ their continuous FEM’s before making them ‘official’ for NAAQS usage. (I.e., Shielding ‘FEM’ data from NAAQS usage) - Continued

If reality testing meets Class III criteria, S/L/T’s must change monitor type to SLAMS and report data under parameter 88101

slide5

Valid FEM / ARM data reported to AQS (as SLAMS or >2yr SPM) must / will be used for NAAQS applications

Appendix N:

“Except as otherwise provided in this appendix, only (all) valid FRM/FEM/ARM PM2.5 data required to be submitted to EPA's Air Quality System (AQS) shall be used in the design value calculations.”

  • If the continuous instrument is designated as the ‘primary’ 88101 monitor at a site, all of the FEM data will be used.
  • If ‘designated’ as a collocated 88101 monitor, the FEM data will be used to augment the primary monitor data … but that means that typically 2/3rds or 5/6ths of the FEM data will be used.
    • Note: Even if the S/L/T doesn’t actually ‘designate’ the FEM as ‘primary’ or ‘collocated by using the applicable AQS fields, the designation will be assumed (according to the relevant Network Plan and/or at EPA discretion)
slide6

Valid FEM / ARM data reported to AQS (as SLAMS or >2yr SPM) must / will be used for NAAQS applications - Continued

Reminder of stipulated augmentation procedure:

Appendix N:

“… calculations shown in this appendix shall be implemented on a site-level basis. Site level data shall be processed as follows:

(1) The default dataset for a site shall consist of the measured concentrations recorded from the designated primary FRM/FEM/ARM monitor. The primary monitor shall be designated in the appropriate State or local agency PM Monitoring Network Description. All daily values produced by the primary sampler are considered part of the site record (i.e., that site's daily value); this includes all creditable samples and all extra samples.

(2) Data for the primary monitor shall be augmented as much as possible with data from collocated FRM/FEM/ARM monitors. If a valid 24-hour measurement is not produced from the primary monitor for a particular day (scheduled or otherwise), but a valid sample is generated by a collocated FRM/FEM/ARM instrument (and recorded in AQS), then that collocated value shall be considered part of the site data record (i.e., that site's daily value). If more than one valid collocated FRM/FEM/ARM value is available, the average of those valid collocated values shall be used as the daily value.”

slide7

OAQPS proposes a “composite site” aggregation approach tweak (when a filter-based FRM is collocated with a continuous FEM/ARM) that should minimize S/L/T consternation. Actually the “tweak” is not related to the aggregation method but rather to the method of discerning samples (in the composite site record) as either “creditable” or “extra”

Appendix N:

Creditable samples are samples that are given credit for data completeness.  They include valid samples collected on required sampling days and valid “make-up” samples taken for missed or invalidated samples on required sampling days.

Extra samples are non-creditable samples.  They are daily values that do not occur on scheduled sampling days and that can not be used as make-ups for missed or invalidated scheduled samples. Extra samples are used in mean calculations and are subject to selection as a 98th percentile.

:(e) All daily values in the composite site record are used in annual mean and 98th percentile calculations, however, not all daily values are give credit towards data completeness requirements. Only “creditable” samples are given credit for data completeness. Creditable samples include valid samples on scheduled sampling days and valid make-up samples. All other types of daily values are referred to as “extra” samples.”

slide8

OAQPS proposes a “tweak” is the method of discerning samples (in the composite site record) as either “creditable” or “extra” - Continued

Does it really matter if samples are classified as “extra” instead of “creditable”?

  • Could help with capture rates
  • Definitely will have ramifications to 98th percentiles

Appendix N:

“Identification of annual 98th percentile values … will be based on the creditable number of samples (as described below), rather than on the actual number of samples. Credit will not be granted for extra (non-creditable) samples. Extra samples, however, are candidates for selection as the annual 98th percentile. [The creditable number of samples will determine how deep to go into the data distribution, but all samples (creditable and extra) will be considered when making the percentile assignment.] The annual creditable number of samples is the sum of the four quarterly creditable number of samples.”

slide9

OAQPS proposes a “tweak” is the method of discerning samples (in the composite site record) as either “creditable” or “extra” - Continued

The proposed approach for determining if a samle in the composite site record is “creditable” or “extra”

  • The site record sampling frequency for a given day with data (in the composite site record) will be based on the sampling frequency of the POC from which the data were pulled. (Essentially gives credit to all collocated FEM samples that are present on non-scheduled 1-3 or 1-6 days) … because the site frequency for those days is 1-1)
  • The site record sampling frequency for a given day without data (in the composite site record) will be based on the sampling frequency of the designated primary POC. (Doesn’t ‘ding’ the site for days where the collocated continuous sampler didn’t yield data)
  • Examples provided later today!