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Temporal and Spatial Variations of PM2.5 Mass in Georgia Xiaolu Zhang EAS 6410 Spring 2007.

Published byMarilynn Dixon Modified over 9 years ago

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Presentation on theme: "Temporal and Spatial Variations of PM2.5 Mass in Georgia Xiaolu Zhang EAS 6410 Spring 2007."— Presentation transcript:

1 Temporal and Spatial Variations of PM2.5 Mass in Georgia Xiaolu Zhang EAS 6410 Spring 2007

2 Introduction PM2.5 : particulate matter with an aerodynamic diameter ≤ 2.5 µm ( fine particle ) Formation: primary and secondary Precursors include SO 2, NOx, NH 3, VOC Adverse effects: public health, poor visibility…

3 PM 2.5 composition - Atlanta

4 NAAQ Standards for PM2.5 NAAQS: National Ambient Air Quality Standard Annual PM2.5 standard: the annual arithmetic mean concentration ≤ 15.0 µg/m 3 24-hour PM2.5 standard: the 98th percentile 24-hour concentration ≤ 65 µg/m 3 Non-attainment areas in Georgia ( 2004 )

5 PM2.5 Nonattainment Areas

6 Data Acquisition Georgia’s Ambient Monitoring Program (AMP) ATHENS CONFDAVE GWINNETT MCDONOUGH NEWNAN YORKVILL WALTON SDEKALB AUGUSTA COLUMBUS MACON SAVLA Urban Rural Urban Rural Urban

7 Sampling Method Tapered Element Oscillating Microbalance (TEOM) –On-line measurement –Directly measures PM mass by measuring the changing weight of a filter as it accumulates particles –Is sensitive to humidity and temperature –Detection limit ~ 1.5 µg/m 3

8 (Rain) 24h VS 1h avg. Metro Atlanta PM spikes often driven by sulfate precipitation – negative impact PM2.5 mass strongly influenced by

9 Atlanta vs Rural Yorkville, GA ~80 km west of Confed. Ave.

10 Atlanta vs Rural 04/11/07 Most polluted day 04/07/07 Cleanest day Confed. Ave Yorkville

11 Spatial Variation In Georgia Highest concentration: Urban Atlanta, Savannah Lowest concentration: Rural Atlanta, Athens Similar pattern of curves

12 Correlations with Metro Atlanta Concentration SiteR2R2 ATHENS0.8349 GWINNETT0.8874 MCDONOUGH0.9756 NEWNAN0.9413 SDEKALB0.9236 WALTON0.801 YORKVILL0.9423 AUGUSTA0.9074 COLUMBUS0.8729 MACON0.7346 SAVLA0.1379  High correlations with metro Atlanta PM2.5 are found for most sites. ( R 2 > 0.7 )  Similar weather condition is a possible reason of high correlations  Exception: Savannah

13 Conclusion Precipitation has a strong negative impact on PM2.5 mass concentration. In urban site PM2.5 mass is significantly higher than in rural site. Urban Atlanta and Savannah have the highest PM2.5 mass concentration while rural Atlanta and Athens have the lowest. Most cities have high correlations with Atlanta in PM2.5 mass except for Savannah.

14 Thanks !

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