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Iowa Department of Natural Resources

Monday, May 20, 2013

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Background Data

The Department periodically analyzes the monitored concentrations across the state to determine the background value concentrations that should be added to dispersion modeling results for comparison to the National Ambient Air Quality Standards (NAAQS). Both default and time-varying background values are provided below.

Default
Daily PM2.5 Data

Pollutant	Area	Averaging Period	Background Concentration Value (µg/m³)
NO₂	Statewide	1-hour Annual	75 15
SO₂	Statewide	1-hour 3-hour 24-hour Annual	32 27 9 1
PM_2.5	West*	24-hour Annual	24 9.7
PM_2.5	East*	24-hour Annual	29 10.9
PM₁₀	Statewide	24-hour	53
CO	Statewide	1-hour 8-hour	1,600 1,000
Pb	Statewide	Rolling 3-month average	0

* Refer to map below for definition of PM_2.5 background areas.
Depiction of PM2.5 background areas

Depiction of PM2.5 background areas

Use of CAMx in Establishing Statewide Default PM2.5 Background Concentrations

This data is intended for use in non-PSD 24-hour PM2.5 modeling analyses conducted using the 2005-2009 meteorological datasets maintained by the Department. The data is formatted for use in the AERMOD dispersion model and is specific to certain areas of the state. Refer to the map shown below and choose the data that matches the location being modeled.

Depiction of PM2.5 baseline area pairing with the 2005-2009 meteorological data

Meteorological Station		Background Data
KALO	(Waterloo)	West		East
KAMW	(Ames)	West		East
KBRL	(Burlington)			East
KCID	(Cedar Rapids)			East
KDBQ	(Dubuque)			East
KDSM	(Des Moines)	West		East
KDVN	(Davenport)			East
KEST	(Estherville)	West
KFSD	(Sioux Falls)	West
KIOW	(Iowa City)			East
KLSE	(La Crosse)			East
KLWD	(Lamoni)	West
KMCW	(Mason City)	West		East
KMIW	(Marshalltown)			East
KMLI	(Moline)			East
KOMA	(Omaha)	West
KOTM	(Ottumwa)	West		East
KSPW	(Spencer)	West
KSUX	(Sioux City)	West

Daily PM2.5 Background Data Technical Support Document

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