MISSING OZONE DATA ANALYSIS

2010 AND SUPPLEMENTAL 2009

FOR

BRANDYWINE (AQS SITE ID 10-003-1010)

DELAWARE DEPARTMENT OF NATURAL RESOURCES AND

ENVIRONMENTAL CONTROL

DIVISION OF AIR QUALITY

July 5, 2011
Conclusion 5

2010 Data Analysis 6

Methodology 6

Historical data 6

Statistical Procedures 7

Results 8

Impact on Design Values 10

Conclusion 11

2009 Supplemental Data Analysis 13

Methodology 13

2009 data 13

Results 13Conclusion 15

APPENDIX A — Procedures 16

2010 ozone data analysis 162009 ozone data analysis 16

APPENDIX B —Ozone Data Tables and Figures 18

2010 Daily 8-hour ozone maxima 182009 Daily 8-hour ozone maxima for selected dates 252009 Solar radiation graphs 272009 24-hour Precipitation maps from NCDC ASOS 292009 8-hour ozone maxima AirNOW maps 31

APPENDIX C- Data 35
was 95% for 2008 and 79% for 2009, for a three year average 2008

2010 of 86%.

Section 2.3(b) of Appendix Ito 40 CFR Part 50 requires three consecutive years of data with

data availability of at least 90% on average, with a minimum data completeness in any one yearof at least 75%. Furthermore, this section also states:

“... When computing whether the minimum data completeness requirements have been

met, meteorological or ambient data may be sufficient to demonstrate that meteorologicalconditions on missing days were not conducive to concentrations above the level ofthe

standard. Missing days assumed less than the level ofthe standard are countedfor the

purpose ofmeeting the data completeness requirement, subject to the approval ofthe

appropriate Regional Administrator.”

Because the missing data occurred largely during mid-summer with associated high dailyaverage temperatures, meteorological data alone were not sufficient to estimate missing data

below the NAAQS. Delaware therefore performed a correlation analysis between theBrandywine site and other local regional ozone monitors to demonstrate that a suitable linearregression equation with a high coefficient of determination could be used to generate estimateddaily 8-hour ozone maxima for the missing days in 2010.In July 2010, Delaware had performed a missing data analysis for 2009 data from the

Brandywine site (Data Substitution Analysis, 2009 Ozone, Brandywine AQS Site ID 10-003-

1010, DE DNREC, Division of Air Quality, July 15, 2010). Further review ofthe 2009 ozone

monitoring data for the Brandywine site and nearby regional sites indicated that there were a

significant number of additional missing days likely to be below the NAAQS. To supplement

the earlier analysis, Delaware expanded the meteorological assessment for additional missing

days in 2009.

In the original missing 2009 ozone data analysis, Delaware DAQ used a daily maximum

temperature assessment to determine what missing days should be counted as valid days inregards to data completeness. In the current assessment, there were a number of additional days

identified as having low ozone concentrations measured by other nearby monitoring sites even

though the daily maximum temperature was slightly higher than the original cut-off level of 75

°F. Additional factors considered in the current assessment include precipitation, cloud cover,

and wind speed data as well as regional ozone daily maxima maps from the AirNOW web site.
ozone values for the missing days at Brandywine.

• Using the regression equation, there were 26 days with estimated maxima below the 1997

NAAQS. The highest estimated daily maximum was 0.078 ppm, which is 0.007 ppm

lower than the NAAQS exceedance level of 0.085 ppm. This was deemed to be an

adequate margin of error to reasonably assume the 26 missing days to be below the

NAAQS.

• No difference was found in the design values for Brandywine calculated with or without

the estimated daily maxima. The conclusion is that use ofthe correlation method would

have no effect on the design value.

• With the 26 additional days assumed to be less than the standard, data completeness for

Brandywine in 2010 is 97%.

The Delaware DNREC Division of Air Quality (DAQ) therefore determined that the use ofthe

null data code, “BG”, for the following 26 days is appropriate:

Dates Day Count

5/21 1

5/27 1

5/30-31 2

6/14 1

7/25—7/27 3

7/29—8/9 12

8/12—8/16 5

8/18 1

TOTAL 26

Adding the 26 days to the Brandywine data results in a data capture percentage of 97% for 2010.

Results for 2009 missing data analysis:

Dates with low regional ozone 8-hour maxima (less than 50 ppb) and meteorology consistentwith low ozone concentrations were identified. Specific meteorology for the Wilmington area

was examined and supporting evidence for low ozone concentrations at the Brandywine site was
Dates proposed for use of”BG”

5/14/2009

6/23/20096/30/2009

7/3/20097/4/2009

7/23/2009

8/6/2009

8/7/2009

8/13/20098/28/2009

8/29/20098/31/2009

9/1/2009

10/7/200910/9/2009

10/21/2009

With these 16 additional days assumed to be less than the standard, combined with the

previously accepted 55 days, data completeness for Brandywine in 2009 is 86%.

ConclusionCombining the 16 additional days assumed to be less than the standard in 2009 with the 26

additional days assumed to be less than the standard for 2010, the final three year average datacapture for 2008 —2010 for Brandywine would be 93%. This meets the minimum requirementof 90% as stated in 40 CFR Part 50 Appendix I Section 2.3(b).
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August), so a strictly meteorological analysis would not be sufficient to evaluate missing data

assumed to be below the standard. However, because ozone levels are generally consistentacross a local geographic area, ozone values from other nearby monitors could be considered

representative ofBrandywine concentrations if a strong correlation statistical relationship was

established. The local regional ozone daily maximum data were therefore evaluated forcorrelation statistics and consistency with the Brandywine site (BCSP) to determine which dayscould be assumed to be below the 1997 NAAQS 8-hour exceedance level of 0.085 ppm.

(Note: Although the actual 1997 NAAQS is 0.08 ppm, monitored values of0. 085 ppm and above

are considered to be exceedances ofthe NAAQS, therefore for the purposes ofthis evaluation alevel of 0.085 ppm is used.)

Historical data: Ozone data from 2006 — 2010 were compiled for the Brandywine site along

with data from monitors within a range of approximately 20 miles as shown as solid triangles in

Figure 1 and listed in Table Al of Appendix A. Daily 8-hour ozone maxima for each site werecalculated in accordance with 40 CFR Part 50 Appendix I Section 2.1, and the highest regional

8-hour value for each day was determined. The daily maximum data are included in Appendix

C.

Figure 1

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in Table Bl of Appendix B.

Figure 2

0.040

0.0200.000

2010 daily 8-hour 03 max

Max 03 Missing BCSP BCSP

Statistical Procedures: Linear correlation analysis was performed on the daily 8-hour ozone

maxima from the selected local regional monitoring sites. The method is similar to analyses

frequently utilized by other state and local air agencies in comparing ambient measurements fordifferent monitoring methods, such as comparisons of particulate matter methods as well as

Maryland Department of the Environment’s recent ozone substitution analysis (Impact ofMissing Data at Rockville Ozone Monitor on the Washington, DC-MD-VA Non-AttainmentArea, Ambient Air Monitoring Program, Air and Radiation Administration Management,Maryland Department of the Environment, January 11, 2011).

0.1200.100

0.0800.060

4/1/2010 5/1/2010 6/1/2010 7/1/2010 8/1/2010 9/1/2010 10/1/2010
The regression analysis shows a coefficient of determination (R2)of 0.9211, which demonstratesa very strong relationship for daily ozone maxima between the Brandywine site and other

monitors within a 20 mile radius. There is also a positive intercept (residual) in the regression

equation, which assures that the estimated replacement values generated by using the regressionequation will be higher than the actual regional daily maxima by at least 0.003 ppm. The

strength ofthe correlation equation and the positive residual value were determined to represent

a sufficiently robust and conservative estimation method with a sufficient level of confidence,and the regression was therefore deemed suitable for generating estimated daily maxima ozone

values for the missing days at Brandywine.

Results

Applying the regression equation to the regional daily maxima resulted in estimated replacementvalues for all missing Brandywine data as shown in Figure 4. Replacement data are shown in

shaded boxes in Table B2 of Appendix B.

0.140

0.1200.100 E

0.0.C

0.080

E

E 0.060

C

0GJ

V

0.0400.020

I

0.000

0 0.02 0.04 0.06 0.08 0.1 0.12

Brandywine daily max in ppm

0.14
0.0400.020

0.000

4/1/20 10

Using the regression equation to replace all missing days at Brandywine resulted in 33 estimateddaily 8-hour ozone maxima. Seven ofthese daily maxima, however, had estimatedconcentrations above 0.080 ppm which would be close to or above the actual NAAQS

exceedance level of 0.085 ppm.To estimate the daily 8-hour ozone maxima below the NAAQS, therefore, all days withcalculated values above 0.080 ppm were eliminated, leaving a total of 26 estimated dailymaxima. The eliminated data points are shown in red in Table B2 of Appendix B. Theremaining highest estimated daily maximum was 0.078 ppm, which is 0.007 ppm below the 1997

NAAQS exceedance level of 0.085 ppm.

All estimated daily maxima for Brandywine were higher than the actual measured local regionalmaxima by at least 0.004 ppm, and this was deemed to be an adequate margin of error to assure

that the estimated values were reasonably representative of daily maxima below the NAAQS.

A graphical representation of the results with the estimated values for the 26 replacement days is

shown in Figure 5.

0.120

0.1000.0800.060

5/1/2010 6/1/2010 7/1/2010 8/1/2010 9/1/2010 10/1/2010
0.120

0.100

0.080

0.0600.040

0.0200.000

4/1/2010 5/1/2010 6/1/2010 7/1/2010 8/1/2010 9/1/2010 10/1/2010

The daily maxima values in Figure 5 are also shown in Table B2 of Appendix B.

Impact on Design Values

In order to evaluate the potential impact ofthe estimated values shown in Figure 5 on the 8-hour

ozone design value for the Brandywine site, the design values were calculated with and without

the substituted estimated daily maxima. The results are shown in Table 1.
2010 0.086 0.084 0.080 0.079

Subst. 2010 0.086 0.084 0.080 0.079

3-year Design Values

2006-2008 0.083

2007-2009 0.0792008-2010 0.076

2008 — subst. 2010 0.076

It can be seen that the 2008 — 2010 design value of 0.076 ppm for the Brandywine site (three

year average of4th daily max) is not impacted by the estimated substituted daily max valuesbelow the NAAQS.

To further examine potential impacts, the daily maxima for the ten highest values for 2010, bothactual measurements and substituted estimations, were compared as shown in Table 2.

Table 2

1St 2nd 3rd 4th 5th 6th 7th 8th 9th 10th

2010 Data

max max max max max max max max max max

Measured 0.086 0.084 0.080 0.079 0.079 0.079 0.078 0.078 0.077 0.075

Measured plus

Substituted 0.086 0.084 0.080 0.079 0.079 0.079 0.078 0.078 0.078 0.077

It can be seen that there is no impact down to the eighth highest daily maxima (0.078 ppm).

It is therefore reasonable to conclude that using the linear regression to estimate missing dailymaximum 8-hour Brandywine ozone data below the 1997 NAAQS does not affect the designvalue for that site and therefore does not impact the design value for the local regional

monitoring area.

Conclusion

The correlation analysis showed a high coefficient of determination (R2 of 0.9211) between the

Brandywine daily 8-hour maxima and the local regional daily maxima, and a small positiveintercept/residual of 0.003 ppm. The resulting regression equation was deemed suitable for

generating estimated daily maxima ozone values for the missing days at Brandywine.
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or without the estimated daily maxima. The conclusion is that use ofthe correlation method

would have no impact on the Brandywine design value.

With the 26 additional days assumed to be less than the standard, data completeness for

Brandywine in 2010 is 97%.The Delaware DNREC Division of Air Quality (DAQ) therefore determined that the use ofthe

null data code, “BG”, for the following 26 days as shown in Table 3 is appropriate:Table 3

Dates Day Count

5/21 15/27 1

5/30-31 2

6/14 1

7/25—7/27 3

7/29—8/9 12

8/12—8/16 5

8/18 1

TOTAL 26

Adding the 26 days to the Brandywine data results in a data capture percentage of 97% for 2010,which results in a three year average data capture of 90% and meets the requirements of 40 CFRPart 50 Appendix I Section 2.3(b).
Methodology

In the original 2009 missing ozone data analysis, Delaware DAQ used a daily maximum

temperature assessment to determine what missing days should be counted as valid days inregards to data completeness. Meteorological data from the Wilmington area was used in

combination with ozone data (both historical data from the Brandywine site and 2009 data fromother nearby ozone sites) to evaluate the missing days of data to determine which days could be

assumed to be below the NAAQS 8-hour standard of 0.075 ppm. This resulted in 55 missingdays in 2009 accepted by EPA as being below the NAAQS with the use ofthe null data codeIn the current assessment, there were a number of days identified as having low ozoneconcentrations measured by other nearby monitoring sites even though the daily maximum

temperature was slightly higher than the original cut-offlevel of 75 °F. Other factors considered

in the current assessment include precipitation, cloud cover, and wind speed data as well as

regional ozone daily maxima maps from the AirNOW web site.

2009 data: Ozone data from monitors in New Castle County and neighboring counties in

Pennsylvania, Maryland, and New Jersey provided evidence that levels on the missing days were

well below the 8-hr ozone NAAQS at Brandywine. The same monitors for the 2010 analysiswere used as shown in Table 1 in Appendix A.Daily meteorological data was retrieved from the National Weather Service site at New Castle

County Airport south of Wilmington and the University of Delaware Environmental EarthObservational System (DEOS) (http://www.deos.udel.edu/). Information and maps for

precipitation were retrieved from the National Weather Service Advanced Hydrologic Prediction

Service website (http://water.weather.gov/precip/). Maps of daily maximum regional ozone

concentrations were retrieved from the EPA AirNOW map archive(http://www.epa.gov/airnow/2009/). Five-minute observations were retrieved from the NationalClimate Data Center Automated Surface Observation Systems (NCDC ASOS) as text files.Copies of data used in this analysis are included in Appendix C — data CD.Results

Dates with low regional ozone 8-hour maxima (less than 50 ppb) and meteorology consistent with lowozone concentrations were identified. Specific meteorology for the Wilmington area was examined andsupporting evidence for low ozone concentrations at the Brandywine site was identified as listed in Table

4.
6/30/2009 x x

7/3/2009 x x7/4/2009 x x

7/23/2009 x x x

8/6/2009 x x

8/7/2009 x8/13/2009 x x8/28/2009 x x8/29/2009 x x

8/31/2009 x

9/1/2009 x

10/7/2009 x

10/9/2009 x

10/21/2009 x

Dates identified as having significant cloud cover are identified in the ASOS data files (appropriate

readings shown in red). In addition, hourly solar radiation levels from the NWS and DEOS websites were

graphed as shown in Appendix B.Dates identified as having precipitation events are shown in Appendix B as ASOS precipitation maps(maps are shown by Z time so date shown appears to be the day after the EDT date).

Some dates without precipitation or cloud cover did have relatively high wind speeds; these dates areincluded in the ASOS and DEOS data files in Appendix C and shown in Table 4 above.

When precipitation, cloud cover, and wind speed did not provide sufficient evidence for conditions

unfavorable for ozone formation, AirNOW regional ozone maps were generated as supplementalevidence that the Brandywine site would not have recorded high ambient concentrations of ozone. Themaps for these dates are shown in Appendix B. As demonstrated in the 2010 missing Brandywine ozonedata analysis, concentrations at Brandywine are highly correlated with concentrations at nearby regionalsites and therefore very low concentrations at nearby sites have a high probability of being representativeof concentrations at Brandywine.
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speeds, and seven days had low regional 8-hour maximum ozone levels.

In reviewing all the primary and supplemental information, the 16 days are being proposed byDelaware as appropriate for the use ofthe null data code “BG” are listed below.

Dates proposed for use of”BG”

5/14/2009

6/23/20096/30/2009

7/3/2009

7/4/2009

7/23/2009

8/6/20098/7/2009

8/13/20098/2 8/20098/29/2009

8/31/2009

9/1/2009

10/7/200910/9/2009

10/21/2009

With the 16 additional days assumed to be less than the standard, combined with the previouslyaccepted 55 days, data completeness for Brandywine in 2009 is 86%.

In combination with the 26 additional days for 2010, the final three year average data capture for

2008 —2010 for Brandywine would be 93% and meets the minimum requirement of 90% as

stated in 40 CFR Part 50 Appendix I Section 2.3(b).
q

b. Data from the following sites were downloaded:

Table Al.

AQS SITE ID COUNTY, STATE SITE NAME

10-003-1010 New Castle County, DE Brandywine

10-003-1013 New Castle County, DE Bellefonte210-003-1007 New Castle County, DE Lums Pond

42-029-0100 Chester County, PA New Garden Airport42-045-0002 Delaware County, PA Chester

34-007-1001 Camden, NJ Camden34-015-0002 Gloucester County, NJ Clarksboro24-015-0003 Cecil County, MD Fair Hill

(2) Analyze 2006 -2010 Ozone data

a. Create a table of daily 8-hour maxima.

b. Calculate a daily regional maximum using the highest value among all sites for each

day.

c. Perform linear regression analysis between Brandywine and the regional daily

maxima

d. Evaluate linear regression results and use to calculate missing daily maxima.

(3) All downloaded data are included in the attached CD as Appendix C.2009 ozone data analysis

(1) Download ambient monitoring data from AQS (maximum daily 8-hr ozone values, AMP 435

Report).

a. The daily maximum 8-hr values are identified in column “Daily Max Sample Value”

when the “Duration” column equals “8-HR RUN AVG BEGIN HOUR”.

b. Data from the same sites used in the 2010 data analysis and listed in Table Al were

downloaded.

c. Identify dates with regional low ozone daily 8-hour maxima (less than 70 ppb) not

already accepted for null data code “BG”.

(2) Download daily meteorological data for the National Weather Service site at New Castle

County Airport south of Wilmington using the University of Delaware Environmental Earth

Observational System (DEOS) (http://www.deos.udel.edu!). Information and maps for

precipitation were retrieved from the National Weather Service Advanced HydrologicPrediction Service website (http://water.weather.gov/precipl). Maps of daily maximum

Estimated substituted data assumed above NAAQS based on regression calculation on

data from other sites; not counted towards data completeness

Measured regional 8-hour max on days of Brandywine missing data

Table BI —2010 daily 8-hour ozone maxima

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4/1/2010 0043 0.038 0.04 0.046 0.049 0.049 0.0494/2/2010 0.048 0.05 0.041 0.052 0.048 0.049 0.052 0.0524/3/2010 0.037 0.039 0.036 0.045 0.037 0.04 0.039 0.045

4/4/2010 0.057 0.06 0.054 0.057 0.051 0.057 0.055 0.0604/5/2010 0.058 0.063 0.056 0.06 0.063 0.062 0.063 0.0634/6/2010 0.064 0.055 0.064 0.049 0.064 0.062 0.059 0.062 0.0644/7/2010 0.068 0.058 0.068 0.052 0.066 0.064 0.066 0.064 0.068

4/8/2010 0.058 0.046 0.056 0.053 0.056 0.056 0.058 0.056 0.0584/9/2010 0.04 0.038 0.04 0.037 0.04 0.037 0.042 0.038 0.0424/10/2010 0.049 0.046 0.048 0.047 0.047 0.047 0.052 0.047 0.052

4/11/2010 0.073 0.064 0.07 0.062 0.068 0.068 0.07 0.07 0.073

4/12/2010 0.056 0.052 0.053 0.052 0.052 0.052 0.057 0.053 0.057

4/13/2010 0.035 0.039 0.032 0.03 0.035 0.038 0.031 0.0394/14/2010 0.055 0.054 0.049 0.052 0.052 0.056 0.052 0.056
4/21/2010 0.039 0.039 0.048 0.045 0.036 0.041 0.037 0.048

4/22/2010 0.061 0.061 0.056 0.058 0.055 0.058 0.0614/23/2010 0.055 0.053 0.052 0.051 0.052 0.049 0.054 0.051 0.0554/24/2010 0.051 0.049 0.054 0.049 0.054 0.049 0.053 0.05 0.054

4/25/2010 0.044 0.04 0.045 0.045 0.042 0.042 0.047 0.042 0.0474/26/2010 0.031 0.029 0.039 0.03 0.029 0.032 0.03 0.039

4/27/2010 0.049 0.047 0.049 0.048 0.048 0.047 0.052 0.048 0.052

4/28/2010 0.042 0.039 0.04 0.038 0.04 0.039 0.043 0.039 0.0434/29/2010 0.053 0.05 0.052 0.049 0.051 0.05 0.053 0.05 0.0534/30/2010 0.071 0.064 0.069 0.057 0.067 0.069 0.067 0.069 0.071

5/1/2010 0.075 0.068 0.073 0.062 0.073 0.078 0.072 0.077 0.078

5/2/2010 0.045 0.049 0.041 0.039 0.046 0.049 0.046 0.044 0.049

5/3/2010 0.045 0.042 0.04 0.042 0.042 0.038 0.042 0.045

5/4/2010 0.062 0.058 0.064 0.054 0.062 0.058 0.063 0.059 0.064

5/5/2010 0.064 0.06 0.069 0.062 0.068 0.064 0.066 0.066 0.069

5/6/2010 0.064 0.061 0.07 0.06 0.065 0.059 0.065 0.06 0.070

5/7/2010 0.046 0.042 0.05 0.046 0.048 0.046 0.048 0.046 0.050

5/8/2010 0.05 0.048 0.057 0.049 0.052 0.048 0.054 0.047 0.0575/9/2010 0.043 0.041 0.043 0.042 0.042 0.04 0.046 0.041 0.0465/10/2010 0.05 0.048 0.051 0.048 0.049 0.046 0.051 0.048 0.051

5/11/2010 0.042 0.041 0.048 0.046 0.047 0.05 0.0505/12/2010 0.038 0.034 0.041 0.041 0.039 0.046 0.039 0.046

5/13/2010 0.05 0.047 0.053 0.049 0.054 0.049 0.054 0.049 0.0545/14/2010 0.054 0.049 0.052 0.048 0.056 0.054 0.051 0.0565/15/2010 0.052 0.05 0.053 0.05 0.05 0.054 0.05 0.054

5/16/2010 0.047 0.045 0.051 0.048 0.049 0.049 0.045 0.051

5/17/2010 0.041 0.039 0.047 0.041 0.043 0.049 0.043 0.0495/18/2010 0.042 0.038 0.047 0.034 0.044 0.042 0.048 0.041 0.048
5/25/2010 0.045 0.043 0.04 0.039 0.044 0.048 0.04 0.047 0.0485/26/2010 0.081 0.06 0.075 0.057 0.063 0.059 0.06 0.075

5/27/2010 0.077 0.061 0.045 0.06 0.057 0.072 0.067 0.072 0.0725/28/2010 0.034 0.032 0.038 0.034 0.038 0.039 0.035 0.039 0.0395/29/2010 0.052 0.051 0.043 0.045 0.049 0.054 0.052 0.051 0.054

5/30/2010 0.061 0.051 0.056 0.05 0.048 0.056 0.049 0.053 0.0565/31/2010 0.064 0.055 0.059 0.052 0.057 0.054 0.053 0.05 0.059

6/1/2010 0.049 0.052 0.056 0.039 0.056 0.051 0.056 0.049 0.056

6/2/2010 0.071 0.071 0.064 0.068 0.074 0.079 0.072 0.075 0.0796/3/2010 0.066 0.065 0.071 0.059 0.071 0.057 0.069 0.0716/4/2010 0.056 0.06 0.07 0.057 0.069 0.057 0.067 0.057 0.070

6/5/2010 0.051 0.051 0.062 0.043 0.057 0.048 0.055 0.048 0.0626/6/2010 0.046 0.047 0.048 0.04 0.047 0.042 0.042 0.04 0.048

6/7/2010 0.044 0.046 0.048 0.041 0.044 0.042 0.045 0.044 0.0486/8/2010 0.045 0.048 0.049 0.044 0.045 0.045 0.044 0.049

6/9/2010 0.035 0.035 0.042 0.041 0.037 0.032 0.0426/10/2010 0.061 0.061 0.054 0.061 0.059 0.053 0.061

6/11/2010 0.049 0.053 0.051 0.051 0.053 0.054 0.057 0.048 0.0576/12/2010 0.056 0.053 0.059 0.051 0.057 0.061 0.06 0.053 0.0616/13/2010 0.039 0.038 0.055 0.042 0.054 0.042 0.04 0.036 0.055

6/14/2010 0.058 0.049 0.053 0.044 0.047 0.048 0.048 0.041 0.053

6/15/2010 0.043 0.046 0.045 0.052 0.05 0.051 0.046 0.043 0.0526/16/2010 0.021 0.038 0.039 0.039 0.039 0.041 0.032 0.041

6/17/2010 0.049 0.05 0.053 0.049 0.05 0.048 0.049 0.041 0.0536/18/2010 0.071 0.067 0.052 0.065 0.062 0.072 0.067 0.067 0.0726/19/2010 0.066 0.061 0.067 0.06 0.066 0.068 0.06 0.061 0.068

6/20/2010 0.063 0.063 0.07 0.058 0.067 0.059 0.059 0.053 0.070

6/21/2010 0.064 0.062 0.073 0.059 0.063 0.061 0.063 0.057 0.073
6/28/2010 0.053 0.057 0.067 0.048 0.065 0.053 0.07 0.043 0.0706/29/2010 0.06 0.059 0.067 0.056 0.061 0.054 0.056 0.05 0.067

6/30/2010 0.053 0.051 0.052 0.049 0.05 0.047 0.049 0.043 0.0537/1/2010 0.041 0.041 0.043 0.038 0.039 0.037 0.04 0.025 0.043

7/2/2010 0.044 0.043 0.044 0.044 0.043 0.041 0.044 0.034 0.0447/3/2010 0.072 0.068 0.064 0.065 0.065 0.072 0.068 0.061 0.072

7/4/2010 0.077 0.067 0.07 0.067 0.075 0.075 0.07 0.07 0.077

7/5/2010 0.078 0.077 0.091 0.074 0.078 0.077 0.079 0.073 0.0917/6/2010 0.08 0.076 0.088 0.074 0.083 0.075 0.073 0.073 0.088

7/7/2010 0.079 0.076 0.086 0.07 0.082 0.078 0.085 0.073 0.086

7/8/2010 0.05 0.045 0.042 0.044 0.042 0.045 0.049 0.047 0.050

7/9/2010 0.038 0.033 0.029 0.033 0.034 0.035 0.034 0.028 0.0387/10/2010 0.032 0.031 0.026 0.03 0.023 0.032 0.033 0.022 0.033

7/11/2010 0.055 0.053 0.066 0.052 0.056 0.051 0.052 0.046 0.066

7/12/2010 0.056 0.051 0.056 0.053 0.056 0.051 0.052 0.048 0.056

7/13/2010 0.052 0.047 0.039 0.038 0.04 0.061 0.054 0.056 0.0617/14/2010 0.034 0.034 0.039 0.033 0.036 0.035 0.036 0.03 0.039

7/15/2010 0.054 0.056 0.055 0.06 0.068 0.054 0.059 0.051 0.0687/16/2010 0.079 0.069 0.066 0.067 0.069 0.088 0.074 0.07 0.088

7/17/2010 0.071 0.074 0.075 0.067 0.078 0.074 0.076 0.064 0.078

7/18/2010 0.06 0.063 0.068 0.061 0.065 0.057 0.066 0.058 0.068

7/19/2010 0.071 0.069 0.059 0.062 0.064 0.073 0.067 0.068 0.073

7/20/2010 0.043 0.047 0.063 0.044 0.05 0.046 0.049 0.041 0.063

7/21/2010 0.052 0.054 0.061 0.051 0.068 0.048 0.067 0.048 0.0687/22/2010 0.052 0.052 0.058 0.049 0.051 0.057 0.055 0.052 0.058

7/23/2010 0.086 0.08 0.068 0.073 0.078 0.09 0.08 0.086 0.090

7/24/2010 0.059 0.059 0.07 0.059 0.065 0.056 0.057 0.055 0.0707/25/2010 0.066 0.051 0.061 0.051 0.053 0.05 0.053 0.061
8/1/2010 0.059 0.053 0.052 0.054 0.054 0.052 0.05 0.053 0.0548/2/2010 0.057 0.046 0.052 0.048 0.051 0.045 0.041 0.047 0.0528/3/2010 0.049 0.039 0.045 0.04 0.043 0.041 0.032 0.038 0.0458/4/2010 0.075 0.067 0.055 0.06 0.061 0.07 0.064 0.068 0.070

8/5/2010 0.072 0.058 0.067 0.055 0.062 0.053 0.06 0.051 0.0678/6/2010 0.070 0.054 0.065 0.053 0.055 0.051 0.054 0.048 0.0658/7/2010 0.067 0.059 0.06 0.06 0.062 0.053 0.057 0.052 0.0628/8/2010 0.065 0.056 0.06 0.056 0.058 0.059 0.055 0.057 0.0608/9/2010 0.069 0.056 0.064 0.06 0.06 0.06 0.058 0.058 0.0648/10/2010 0.103 0.08 0.093 0.084 0.097 0.082 0.086 0.078 0.0978/11/2010 0.084 0.067 0.078 0.068 0.077 0.064 0.064 0.064 0.0788/12/2010 0.050 0.041 0.042 0.046 0.042 0.043 0.043 0.0468/13/2010 0.034 0.028 0.028 0.03 0.03 0.029 0.028 0.03 0.0308/14/2010 0.041 0.033 0.031 0.032 0.033 0.033 0.029 0.037 0.0378/15/2010 0.038 0.027 0.034 0.028 0.03 0.027 0.03 0.028 0.034

8/16/2010 0.061 0.045 0.045 0.042 0.043 0.056 0.044 0.0568/17/2010 0.092 0.067 0.086 0.064 0.068 0.064 0.057 0.071 0.0868/18/2010 0.052 0.041 0.043 0.048 0.042 0.045 0.036 0.047 0.0488/19/2010 0.100 0.087 0.094 0.086 0.094 0.069 0.067 0.073 0.0948/20/2010 0.084 0.064 0.078 0.06 0.067 0.06 0.057 0.058 0.0788/21/2010 0.055 0.057 0.056 0.058 0.062 0.059 0.048 0.061 0.062

8/22/2010 0.037 0.036 0.042 0.039 0.035 0.043 0.035 0.048 0.0488/23/2010 0.043 0.046 0.045 0.04 0.043 0.045 0.038 0.044 0.0468/24/2010 0.028 0.031 0.028 0.027 0.028 0.026 0.022 0.028 0.0318/25/2010 0.027 0.032 0.03 0.028 0.03 0.029 0.021 0.0328/26/2010 0.045 0.048 0.056 0.046 0.048 0.047 0.042 0.0568/27/2010 0.049 0.051 0.053 0.049 0.051 0.047 0.042 0.053

8/28/2010 0.052 0.054 0.06 0.053 0.057 0.052 0.052 0.058 0.060
9/3/

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9/4/2010 0.038 0.041 0.043 0.037 0.04 0.036 0.033 0.038 0.0439/5/2010 0.048 0.05 0.052 0.048 0.049 0.045 0.043 0.049 0.052

9/6/2010 0.054 0.056 0.056 0.054 0.055 0.051 0.046 0.055 0.0569/7/2010 0.064 0.061 0.06 0.058 0.059 0.068 0.052 0.067 0.0689/8/2010 0.062 0.064 0.067 0.059 0.063 0.056 0.054 0.061 0.0679/9/2010 0.031 0.034 0.033 0.03 0.031 0.032 0.028 0.032 0.034

9/10/2010 0.023 0.026 0.025 0.022 0.024 0.025 0.02 0.025 0.0269/11/2010 0.04 0.043 0.041 0.046 0.047 0.039 0.035 0.041 0.0479/12/2010 0.022 0.024 0.024 0.03 0.025 0.027 0.021 0.028 0.0309/13/2010 0.053 0.053 0.052 0.051 0.052 0.052 0.042 0.057 0.057

9/14/2010 0.045 0.047 0.054 0.045 0.048 0.043 0.039 0.045 0.0549/15/2010 0.049 0.048 0.049 0.046 0.048 0.049 0.044 0.05 0.0509/16/2010 0.05 0.05 0.06 0.051 0.057 0.051 0.051 0.0609/17/2010 0.043 0.045 0.047 0.043 0.044 0.042 0.043 0.0479/18/2010 0.044 0.045 0.043 0.043 0.045 0.041 0.047 0.047

9/19/2010 0.06 0.055 0.057 0.058 0.059 0.063 0.063 0.0639/20/2010 0.04 0.041 0.043 0.039 0.04 0.04 0.0439/21/2010 0.04 0.039 0.047 0.042 0.046 0.041 0.0479/22/2010 0.079 0.074 0.068 0.067 0.066 0.07 0.076 0.0799/23/2010 0.055 0.057 0.051 0.056 0.055 0.06 0.063 0.0639/24/2010 0.069 0.064 0.069 0.058 0.063 0.077 0.076 0.077

9/25/2010 0.058 0.057 0.058 0.053 0.06 0.054 0.057 0.0609/26/2010 0.025 0.026 0.037 0.027 0.025 0.026 0.025 0.0379/27/2010 0.016 0.018 0.023 0.019 0.021 0.019 0.02 0.0239/28/2010 0.035 0.035 0.026 0.032 0.026 0.037 0.04 0.0409/29/2010 0.025 0.029 0.028 0.026 0.027 0.031 0.0319/30/2010 0.026 0.03 0.025 0.024 0.023 0.027 0.029 0.030

10/1/2010 0.03 0.033 0.031 0.028 0.027 0.03 0.033
10/8/2010 0.047 0.045 0.042 0.04 0.042 0.045 0.048 0.04810/9/2010 0.053 0.054 0.051 0.052 0.051 0.051 0.053 0.05410/10/2010 0.041 0.04 0.047 0.036 0.043 0.039 0.043 0.047

10/11/2010 0.068 0.069 0.066 0.06 0.063 0.066 0.069 0.06910/12/2010 0.048 0.05 0.047 0.044 0.042 0.047 0.049 0.05010/13/2010 0.024 0.025 0.035 0.027 0.025 0.027 0.031 0.035

10/14/2010 0.023 0.024 0.03 0.019 0.018 0.024 0.025 0.025 0.03010/15/2010 0.033 0.035 0.033 0.03 0.032 0.032 0.036 0.034 0.03610/16/2010 0.033 0.036 0.034 0.033 0.033 0.031 0.036 0.034 0.036

10/17/2010 0.052 0.049 0.049 0.044 0.047 0.047 0.047 0.052 0.05210/18/2010 0.033 0.037 0.034 0.032 0.033 0.032 0.034 0.034 0.03710/19/2010 0.025 0.028 0.024 0.022 0.017 0.025 0.028 0.027 0.02810/20/2010 0.022 0.023 0.028 0.027 0.025 0.025 0.026 0.026 0.028

10/21/2010 0.037 0.039 0.037 0.033 0.036 0.033 0.036 0.036 0.03910/22/2010 0.033 0.036 0.034 0.031 0.033 0.03 0.033 0.034 0.03610/23/2010 0.035 0.037 0.04 0.028 0.039 0.037 0.043 0.037 0.04310/24/2010 0.042 0.041 0.048 0.037 0.044 0.046 0.045 0.046 0.048

10/25/2010 0.034 0.031 0.039 0.034 0.037 0.035 0.04 0.036 0.04010/26/2010 0.019 0.018 0.025 0.02 0.023 0.022 0.027 0.023 0.02710/27/2010 0.018 0.016 0.023 0.016 0.02 0.019 0.024 0.017 0.02410/28/2010 0.045 0.043 0.04 0.038 0.041 0.04 0.04 0.045 0.04510/29/2010 0.026 0.025 0.023 0.023 0.026 0.026 0.03 0.027 0.030

10/30/2010 0.031 0.032 0.035 0.031 0.033 0.031 0.036 0.032 0.03610/31/2010 0.033 0.035 0.035 0.032 0.033 0.031 0.037 0.034 0.037
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4/3/2009 0.046 0.052 0.044 0.048 0.049 0.047 72 0.052

4/17/2009 0.055 0.064 0.055 0.058 0.060 0.058 0.056 69 0.064

4/18/2009 0.064 0.075 0063 0.068 0.066 0.064 77 0.075

4/24/2009 0.053 0.068 0.056 0.060 0.064 0.060 0.059 72 0.0684/25/2009 0.065 0.073 0058 0.067 0.076 0.063 0.067 88 0.076

4/26/2009 0.069 0.074 0.058 0.063 0.070 0.063 0.065 91 0.0744/27/2009 0.067 0.067 0.061 0.064 0.072 0.064 0.068 89 0.0724/28/2009 0.061 0.062 0.057 0.064 0.067 0.059 0.065 86 0.067

5/8/2009 0.054 0.063 0.056 0.059 0.059 0.057 0.055 76 0.0635/9/2009 0.054 0.054 0.051 0.056 0.057 0.053 0.052 83 0.057

5/13/2009 0.059 0.061 0.063 0.065 0.063 0.063 71 0.0655/14/2009 0.049 0.044 0.046 0.048 0.044 0.044 75 0.049 X5/15/2009 0.029 0.043 0.045 0.055 0.053 79 0.055

5/20/2009 0.063 0.068 0.063 0.062 0.068 0.065 78 0.0685/21/2009 0.055 0.062 0.056 0.059 0.062 0.060 79 0.0626/10/2009 0.051 0.037 0.043 0.045 0.064 0.066 82 0.0666/23/2009 0.043 0.049 0.041 0.043 0.044 0.046 0.043 83 0.049 X

6/30/2009 0.052 0.057 0.052 0.057 0.057 0.054 0.056 86 0.057

7/1/2009 0.057 0.060 0057 0.066 0.056 0.052 0.054 85 0.0667/2/2009 0.050 0.058 0.048 0.056 0.047 0.050 0.047 83 0.058

7/3/2009 0.041 0.046 0.040 0.044 0.039 0.041 0.039 81 0.046 X

7/4/2009 0.048 0.050 0.045 0.048 0.047 0.049 0.045 82 0.050 X
8/8/2009 0.062 0.046 0.065 0.058 0.058 0.056 0.060 82 0.0658/9/2009 0.053 0.045 0.050 0.044 0.048 0.040 87 0.0578/10/2009 0.070 0.055 0.067 0.052 0.061 0.051 93 0.0708/11/2009 0.055 0.069 0.055 0.059 0.055 0.061 0.054 88 0.0698/12/2009 0.043 0.050 0.045 0.048 0.051 0.056 0.049 88 0.0568/13/2009 0.025 0.036 0.029 0.036 0.046 0.049 0.041 78 0.049 X8/14/2009 0.058 0.058 0.063 0.071 0.049 0.058 0.049 84 0.0718/24/2009 0.045 0.060 0.047 0.048 0.045 0.046 0.043 86 0.0608/25/2009 0.046 0.058 0.049 0.055 0.048 0.048 0.043 85 0.0588/26/2009 0.057 0.064 0.057 0.061 0.055 0.060 0.056 87 0.0648/27/2009 0.039 0.042 0.037 0.039 0.046 0.065 0.044 84 0.0658/28/2009 0.030 0.041 0.034 0.035 0.033 0.041 0.032 76 0.041 X8/29/2009 0.024 0.032 0.027 0.031 0.032 0.037 0.029 82 0.037 X8/30/2009 0.046 0.053 0.046 0.051 0.045 0.047 0.044 83 0.053

8/31/2009 0.028 0.028 0.027 0.025 0.027 0.017 0.025 75 0.029 X9/1/2009 0.040 0.042 0.041 0.035 0.038 0.015 0.039 75 0.045 X

9/2/2009 0.056 0.052 0.058 0.054 0.064 0.021 0.061 77 0.064

10/7/2009 0.031 0.032 0.029 0.030 0.031 0.030 0.030 72 0.032 X10/9/2009 0.047 0.048 0.046 0.049 0.048 0.049 79 0.049 X

10/21/2009 0.043 0.037 0.038 0.038 0.032 0.044 75 0.044 X
E

-c

Hourly solar radiation - May 2009

—20-May high 03 14-May low 03

1 2 3 4 5 6 7 8 9 10111213 1415 161718192021222324

Hour

June 2009

Hourly solar radiation -June 2009

1000

——6-25 high 03 ——.6-23 low 03 6-30 low ozone

eJ

E

-t

900800700 -— 600

500400300

200 --_______________0:

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24

Hour
1 2 3 4 5 6 7 8 9 101112131415161718192021222324

Hour

August

Hourly solar radiation - August 2009

8-15 high 03 8-6low 03 8-13 low 03

8-28 low 03 ---=—8-29 low 03

900 -- ——--——-———--—-----------—--—- 800 —___________________700 ---———-____________________________________________________600500400 —------- -_____________________________________

300 — ---_________________________________________200 -

- ---- 

100 — —,-

—______________

0

1 2 3 4 5 6 7 8 9 1011 12 13 1415 16 17 18 1920212223 24

Hour
Map for 8/6/09

re: 8/7/2009 1 -Diu 0bsor,od Proc ipi tati or

V&Ld at 8/7/2001) 1200 OTC- Croatod 5/31/10 2:33 UTC

Map for 8/13/09

0oIaare: 8/14/2009 1-0a 0(sorved Precipitation

Valid it 8/14/2009 1200 Lilt- Created 5/31/10 2:53 Lilt
Map for 8/29/09

Io I wrne 8130/2Q09 I -D OIorvecI Procipitiitl onVHcI t 8flO/2OO’ 1200 UTC- Creatod /31/10 340 LJTC
— JuIi4, 2009
August 3.,


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• NCDC ASOS 5-minute average data for selected dates (Word files)• Daily ozone 8-hour maxima maps from AirNOW for selected dates (giffiles)