Conducted CMAQ (2002 version) and PM-CAMx performance evaluation based on

July 1999 SOS episode (6/29-7/11) modeling study (32-km nested w/ 8-km in the SE

U.S., including Atlanta & Nashville)

• Ozone performance: use MNB & MNE w/ 60 ppb threshold for O3 (CMAQ performed

better):

CMAQ: MNB < 1%, MNE = 18%

CAMx: MNB = 27%, MNE = 33%

• PM performance: CMAQ & PM-CAMx are generally consistent in the rural areas (vs.

IMPROVE); differs significantly over urban/suburban; in general, CMAQ performs

much better than PM-CAMx

PM 2.5: CMAQ: MNB = 38%, MNE = -7%

CAMx: MNB = 55%, MNE = 35%

Sulfate: CMAQ: MNB = 9%, MNE = 45%

CAMx: MNB = 44%, MNE = 63%

Nitrate: CMAQ: MNB = -50%, MNE = 98%

CAMx: MNB =137%, MNE = 158%

• The performance of CMAQ for PM and O3 is consistent with the performance

expected for air quality models (however, nitrate issue existed); the performance of

CAMx does not generally meet current expectations for AQM.

 

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