# Presentation: 302152

## The 2005 Crittenden County Ozone Study (CCOS)

**Objectives **
**Measurements**
**Preliminary Results**
**2006 National Air Quality Conference**
**San Antonio, Texas**
**Bill Parkhurst, TVA Environmental Technologies**

**Arkansas News Bureau** ***“Hot weather conditions and a “plume of smog” are hurting efforts to meet stringent ozone conditions in an eastern Arkansas county that state leaders hope may one day land an automobile plant, state officials said Thursday.”***

## Sponsors, Partners & Collaborators

- Arkansas Dept. of Env. Quality
- ICF Consulting
- Univ. of Alabama-Huntsville
- Memphis/Shelby Co. Health Dept.
- EPA Regions IV and VI
- Tennessee Dept. of Env. & Conservation
- Mississippi Commission on Env. Quality
- Tennessee Valley Authority

## Objectives

- Economic – Jobs. Industrial/manufacturing expansion in Crittenden County, Arkansas.
- Regulatory – Attainment. Assist in the development of SIP to bring Memphis area into attainment with 8-hour ozone standard.
- Scientific – Facts. Measure the 3-D structure of ozone production, accumulation and transport in and downwind of Memphis.

## What we did...

-  Added three new surface ozone monitoring stations to improve directional coverage.
-  Added UAH Mobile Integrated Profiling System (MIPS).  A 915 MHz profiling radar, a 2 kHz sodar, a laser ceilometer, and a surface station.
-  Added TVA helicopter sampling system.

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## 170° 3.5 knots

**VRB 3.5 knots**

**170° 3.5 knots**

**60° 2.5 knots**

## CCOS, Ozone (ppbv), July 23, 2005, 1339-1455 CST

**CCOS, Ozone (ppbv), July 23, 2005, 1339-1455 CST**

**230° 5.5 knots**

**230° 1 knot**

**VRB 4 knots**

**89** 8-hr Max at Marion
**111** 1-hr Max at Marion

## 230° 5 knots

**230° 5 knots**

**VRB 3 knots**

**285° 2 knots**

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## CCOS, Ozone (ppbv), August 4, 2005, 1340-1514 CST

**CCOS, Ozone (ppbv), August 4, 2005, 1340-1514 CST**

**50° 4 knots**

**75° 2.5 knots**

**40° 5.5 knots**

**70** 8-hr Max at Marion
**78** 1-hr Max at Marion

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## CCOS, Ozone (ppbv), September 22, 2005, 1303-1418 CST

**CCOS, Ozone (ppbv), September 22, 2005, 1303-1418 CST**

**130° 4 knots**

**140° 3 knots**

**190°5 knots**

**81** 8-hr Max at Orgill
**96** 1-hr Max at Orgill

## TVA helicopter and happy crew return to Muscle Shoals

## A few preliminary thoughts...

- Memphis ozone plume observed up to 60 km downwind under persistent wind conditions.
- Existing monitoring network has substantial holes.
- From June through September, Memphis area 1-hr ozone production/accumulation averages 25 ppb above background.
- On days (32) with 1-hr ozone >90 ppb, Memphis area 1-hr ozone production/accumulation averages 40 ppb above background.
- On days (15) with 1-hr ozone >100 ppb, Memphis area 1-hr ozone production/accumulation averages 48 ppb above background.
- Marion monitor is “close enough” to observe high 1-hour ozone and “rural enough” to measure high 8-hour ozone.
- 13 days with 8-hour ozone above standard.

## Future analysis work...

- On several days, the Memphis urban plume was parallel to the Allen Power Plant plume. With SO2 marker could consider ozone production differences.
- Rich data base for model testing and development.
- Integrate study results into Memphis SIP.

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