EPA allows data that have been directly influenced by exceptional and/or natural events (e.g., caused by blowing dust from major storms) to be excluded in the determination of exceedances and NAAQS violations for State Implementation Plan (SIP) purposes. Persuant to 40 CFR 50.14(c)(3)(i), the Arizona Department of Environmental Quality is soliciting comments on its final demonstrations of events that have caused elevated concentrations of PM10 throughout Arizona and ADEQ's decision to flag these episodes based on these analyses. Copies of the demonstrations are available for review below, beginning Monday, Aug. 11, 2008. Interested parties can submit written comments throughout the comment period which will end at 5:00 p.m. on Wed., Sept. 10, 2008. Any comments received will be forwarded to EPA with the final demonstrations.

• Public Notice
• Cover Page
• Binder Tab Index

* Agency

ADEQ: Arizona Department of Environmental Quality
MCAQD: Maricopa County Air Quality Department
PCAQCD: Pinal County Air Quality Control District

** EPA Air Quality System Identification Number

{LMP Flag}: Value below NAAQS flagged for LMP eligibility
Type Abbreviations: FRM: Federal Reference Method Filter Based Monitor
BAM: Beta-Attenuation Mass Monitor (Continuous monitor)
TEOM: Tapered Element Oscillating Microbalance Monitor (Continuous monitor)

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