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Exceptional Events

Notice of Availability Of the Occurrence of an Exceptional Event

The Imperial County Air Pollution Control District (Air District) has prepared four Draft Exceptional Event (EE) Demonstrations, which support the requested exclusion of measured 24-hour concentrations at the Air District air monitoring sites. Listed below by date, site and concentration as measured by a Federal Reference Method monitor (FRM) or with a continuous Federal Equivalent Method monitor (FEM) represent the four Draft EE's.

2014 -May 20
Brawley FEM 250 Micrograms per Cubic Meter

2015 -July 8
Niland FEM 166 Micrograms per Cubic Meter

2016 -May 20 and May 21
Brawley FEM 283 Micrograms per Cubic Meter
Calexico FEM 159 Micrograms per Cubic Meter
Niland FEM 309 Micrograms per Cubic Meter
Westmorland FEM 370 Micrograms per Cubic Meter
Brawley FEM 199 Micrograms per Cubic Meter
Calexico FEM 226 Micrograms per Cubic Meter
El Centro FEM 252 Micrograms per Cubic Meter

2016 -May 25
Brawley FEM 165 Micrograms per Cubic Meter

The public and all interested parties are encouraged to review and comment on the four Draft EE's listed above. These demonstrations provide the supporting evidence that on the days indicated for 2014, 2015 and 2016 Air District air monitors were affected by entrained elevated levels of particulate matter of an aerodynamic size less than 10 microns (PM10). Winds, associated with a weather event entrained PM10 into the region affecting Riverside, Imperial and San Diego counties. The four Draft EE's provide the scientific justification for the requested exclusions. The Air District is soliciting and accepting comments for 30 days commencing the date of the publication of this notice. The final closing date for submitting comments is March 2, 2018 by close of business.

The four Draft EE's for days listed above are available for download at the Air District website at, under "Air Pollution". To view a hard copy of any of the four Draft EE's, please visit the Air Pollution Control District office at 150 S. 9th Street, El Centro. Should you have any questions or concerns please feel free to call our office between 8am and 5pm at (442) 265-1800 and ask for Monica N. Soucier.
Date of Exceptional EventClosing Date
1/31/2018 3/2/2018
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