UNITED STATES ENVIRONMENTAL PROTECTION AGENCY

DESIGN VALUE REPORT Jan. 8, 2014 Report Request ID: 1163226 Report Code: AMP480

Selection Criteria Page 1 User ID: HXN

State County City

Site Parameter POC AQCR UAR CBSA CSA EPA Region Method Duration Begin Date End Date 11 11 11 24 24 24 24 51 001

001 001 031 033 033 033 013 0041

0042 0043 3001 0025 0030 8003 0020 GEOGRAPHIC SELECTIONS

PROTOCOL SELECTIONS Parameter Classification Parameter Method Duration DESIGN VALUE 88101

SELECTED OPTIONS

SINGLE EVENT PROCESSING WORKFILE DELIMITER USER SITE METADATA MERGE PDF FILES QUARTERLY DATA IN WORKFILE

Option Type Option Value EXCLUDE REGIONALLY CONCURRED EVENTS

, STREET ADDRESS YES NO GLOBAL DATES

2008 Start Date End Date 2013 Tribal Code

APPLICABLE STANDARDS Standard Description PM25 24-hour 2006 PM25 Annual 2006UNITED STATES ENVIRONMENTAL PROTECTION AGENCY AIR QUALITY SYSTEM PRELIMINARY DESIGN VALUE REPORT Report Date: Jan. 8, 2014

Notes: 1. Computed design values are a snapshot of the data at the time the report was run (may not be all data for year). 2. Some PM2.5 24-hour DVs for incomplete data that are marked invalid here may be marked valid in the Official report due to additional analysis. 3. Annual Values not meeting completeness criteria are marked with an asterisk ('*'). Page 1 of 20UNITED STATES ENVIRONMENTAL PROTECTION AGENCY AIR QUALITY SYSTEM PRELIMINARY DESIGN VALUE REPORT Report Date: Jan. 8, 2014

Notes: 1. Computed design values are a snapshot of the data at the time the report was run (may not be all data for year). 2. Some PM2.5 24-hour DVs for incomplete data that are marked invalid here may be marked valid in the Official report due to additional analysis. 3. Annual Values not meeting completeness criteria are marked with an asterisk ('*'). Page 2 of 20 

### Pollutant: Standard Units: NAAQS Standard: Statistic: Statistic: Site-LevelPM2.5 - Local Conditions(88101) Micrograms/cubic meter (LC)(105) PM25 24-hour 2006 / PM25 Annual 2006 Annual Weighted Mean Annual 98th Percentile Level: Level: Design Value Year: 2008

REPORT EXCLUDES MEASUREMENTS WITH REGIONALLY CONCURRED EVENT FLAGS. 15 35 State Name: District Of Columbia Site_ID / STREET ADDRESS | | | Cred. Days Comp. Qrtrs Wtd.

Mean 98th Perctil Cert&

Eval | | | Cred. Days Comp. Qrtrs 98th Perctil Wtd.

Mean Cert& Eval | | | Cred. Days Comp. Qrtrs 98th Perctil Wtd.

Mean Cert&

Eval | | | Design Value Valid

Ind. | | | Design Value Valid

Ind. 24-Hour Annual 2008 2007 2006

11-001-0041 11-001-0042 11-001-0043 420 34th Street N.E.,Washington, DC 20019 PARK SERVICES OFFICE 1100 OHIO DRIVE 2500 1ST STREET, N.W. WASHINGTON DC 354 118 344 4

4 4 29.2 31.4 28.4 12.0

12.3 11.6 335

116 338 4

4 4 32.8 28.7 33.1 13.6

13.7 13.0 352

118 352 4

4 4 35.0 33.0 33.2 13.4

13.3 13.0 Y

Y Y 32

31 32 Y Y Y 13.0 13.1 12.5 Y

Y YUNITED STATES ENVIRONMENTAL PROTECTION AGENCY AIR QUALITY SYSTEM PRELIMINARY DESIGN VALUE REPORT Report Date: Jan. 8, 2014

Notes: 1. Computed design values are a snapshot of the data at the time the report was run (may not be all data for year). 2. Some PM2.5 24-hour DVs for incomplete data that are marked invalid here may be marked valid in the Official report due to additional analysis. 3. Annual Values not meeting completeness criteria are marked with an asterisk ('*'). Page 3 of 20 

### Pollutant: Standard Units: NAAQS Standard: Statistic: Statistic: Site-LevelPM2.5 - Local Conditions(88101) Micrograms/cubic meter (LC)(105) PM25 24-hour 2006 / PM25 Annual 2006 Annual Weighted Mean Annual 98th Percentile Level: Level: Design Value Year: 2009

REPORT EXCLUDES MEASUREMENTS WITH REGIONALLY CONCURRED EVENT FLAGS. 15 35 State Name: District Of Columbia Site_ID / STREET ADDRESS | | | Cred. Days Comp. Qrtrs Wtd.

Mean 98th Perctil Cert&

Eval | | | Cred. Days Comp. Qrtrs 98th Perctil Wtd.

Mean Cert& Eval | | | Cred. Days Comp. Qrtrs 98th Perctil Wtd.

Mean Cert&

Eval | | | Design Value Valid

Ind. | | | Design Value Valid

Ind. 24-Hour Annual 2009 2008 2007

11-001-0041 11-001-0042 11-001-0043 420 34th Street N.E.,Washington, DC 20019 PARK SERVICES OFFICE 1100 OHIO DRIVE 2500 1ST STREET, N.W. WASHINGTON DC 362 116 349 4

4 4 24.3 22.7 24.0 10.5

10.1 10.2 354

118 344 4

4 4 29.2 31.4 28.4 12.0

12.3 11.6 335

116 338 4

4 4 32.8 28.7 33.1 13.6

13.7 13.0 29 28 29 Y Y Y 12.0 12.1 11.6 Y

Y YUNITED STATES ENVIRONMENTAL PROTECTION AGENCY AIR QUALITY SYSTEM PRELIMINARY DESIGN VALUE REPORT Report Date: Jan. 8, 2014

Notes: 1. Computed design values are a snapshot of the data at the time the report was run (may not be all data for year). 2. Some PM2.5 24-hour DVs for incomplete data that are marked invalid here may be marked valid in the Official report due to additional analysis. 3. Annual Values not meeting completeness criteria are marked with an asterisk ('*'). Page 4 of 20 

### Pollutant: Standard Units: NAAQS Standard: Statistic: Statistic: Site-LevelPM2.5 - Local Conditions(88101) Micrograms/cubic meter (LC)(105) PM25 24-hour 2006 / PM25 Annual 2006 Annual Weighted Mean Annual 98th Percentile Level: Level: Design Value Year: 2010

REPORT EXCLUDES MEASUREMENTS WITH REGIONALLY CONCURRED EVENT FLAGS. 15 35 State Name: District Of Columbia Site_ID / STREET ADDRESS | | | Cred. Days Comp. Qrtrs Wtd.

Mean 98th Perctil Cert&

Eval | | | Cred. Days Comp. Qrtrs 98th Perctil Wtd.

Mean Cert& Eval | | | Cred. Days Comp. Qrtrs 98th Perctil Wtd.

Mean Cert&

Eval | | | Design Value Valid

Ind. | | | Design Value Valid

Ind. 24-Hour Annual 2010 2009 2008

11-001-0041 11-001-0042 11-001-0043 420 34th Street N.E.,Washington, DC 20019 PARK SERVICES OFFICE 1100 OHIO DRIVE 2500 1ST STREET, N.W. WASHINGTON DC 340 116 336 4

4 4 28.3 23.2 26.2 11.0

11.0 10.5 362

116 349 4

4 4 24.3 22.7 24.0 10.5

10.1 10.2 354

118 344 4

4 4 29.2 31.4 28.4 12.0

12.3 11.6 27 26 26 Y Y Y 11.2 11.2 10.8 Y

Y YUNITED STATES ENVIRONMENTAL PROTECTION AGENCY AIR QUALITY SYSTEM PRELIMINARY DESIGN VALUE REPORT Report Date: Jan. 8, 2014

Notes: 1. Computed design values are a snapshot of the data at the time the report was run (may not be all data for year). 2. Some PM2.5 24-hour DVs for incomplete data that are marked invalid here may be marked valid in the Official report due to additional analysis. 3. Annual Values not meeting completeness criteria are marked with an asterisk ('*'). Page 5 of 20 

### Pollutant: Standard Units: NAAQS Standard: Statistic: Statistic: Site-LevelPM2.5 - Local Conditions(88101) Micrograms/cubic meter (LC)(105) PM25 24-hour 2006 / PM25 Annual 2006 Annual Weighted Mean Annual 98th Percentile Level: Level: Design Value Year: 2011

REPORT EXCLUDES MEASUREMENTS WITH REGIONALLY CONCURRED EVENT FLAGS. 15 35 State Name: District Of Columbia Site_ID / STREET ADDRESS | | | Cred. Days Comp. Qrtrs Wtd.

Mean 98th Perctil Cert&

Eval | | | Cred. Days Comp. Qrtrs 98th Perctil Wtd.

Mean Cert& Eval | | | Cred. Days Comp. Qrtrs 98th Perctil Wtd.

Mean Cert&

Eval | | | Design Value Valid

Ind. | | | Design Value Valid

Ind. 24-Hour Annual 2011 2010 2009

11-001-0041 11-001-0042 11-001-0043 420 34th Street N.E.,Washington, DC 20019 PARK SERVICES OFFICE 1100 OHIO DRIVE 2500 1ST STREET, N.W. WASHINGTON DC 344 115 354 4

4 4 24.7 26.2 24.8 10.4

10.2 10.2 340

116 336 4

4 4 28.3 23.2 26.2 11.0

11.0 10.5 362

116 349 4

4 4 24.3 22.7 24.0 10.5

10.1 10.2 26 24 25 Y Y Y 10.6 10.5 10.3 Y

Y YUNITED STATES ENVIRONMENTAL PROTECTION AGENCY AIR QUALITY SYSTEM PRELIMINARY DESIGN VALUE REPORT Report Date: Jan. 8, 2014

Notes: 1. Computed design values are a snapshot of the data at the time the report was run (may not be all data for year). 2. Some PM2.5 24-hour DVs for incomplete data that are marked invalid here may be marked valid in the Official report due to additional analysis. 3. Annual Values not meeting completeness criteria are marked with an asterisk ('*'). Page 6 of 20 

### Pollutant: Standard Units: NAAQS Standard: Statistic: Statistic: Site-LevelPM2.5 - Local Conditions(88101) Micrograms/cubic meter (LC)(105) PM25 24-hour 2006 / PM25 Annual 2006 Annual Weighted Mean Annual 98th Percentile Level: Level: Design Value Year: 2012

REPORT EXCLUDES MEASUREMENTS WITH REGIONALLY CONCURRED EVENT FLAGS. 15 35 State Name: District Of Columbia Site_ID / STREET ADDRESS | | | Cred. Days Comp. Qrtrs Wtd.

Mean 98th Perctil Cert&

Eval | | | Cred. Days Comp. Qrtrs 98th Perctil Wtd.

Mean Cert& Eval | | | Cred. Days Comp. Qrtrs 98th Perctil Wtd.

Mean Cert&

Eval | | | Design Value Valid

Ind. | | | Design Value Valid

Ind. 24-Hour Annual 2012 2011 2010

11-001-0041 11-001-0042 11-001-0043 420 34th Street N.E.,Washington, DC 20019 PARK SERVICES OFFICE 1100 OHIO DRIVE 2500 1ST STREET, N.W. WASHINGTON DC 331 111 366 4

4 4 27.8 24.3 23.8 9.8

9.8 9.7 344

115 354 4

4 4 24.7 26.2 24.8 10.4

10.2 10.2 340

116 336 4

4 4 28.3 23.2 26.2 11.0

11.0 10.5 27 25 25 Y Y Y 10.4 10.3 10.1 Y

Y YUNITED STATES ENVIRONMENTAL PROTECTION AGENCY AIR QUALITY SYSTEM PRELIMINARY DESIGN VALUE REPORT Report Date: Jan. 8, 2014

Notes: 1. Computed design values are a snapshot of the data at the time the report was run (may not be all data for year). 2. Some PM2.5 24-hour DVs for incomplete data that are marked invalid here may be marked valid in the Official report due to additional analysis. 3. Annual Values not meeting completeness criteria are marked with an asterisk ('*'). Page 7 of 20 

### Pollutant: Standard Units: NAAQS Standard: Statistic: Statistic: Site-LevelPM2.5 - Local Conditions(88101) Micrograms/cubic meter (LC)(105) PM25 24-hour 2006 / PM25 Annual 2006 Annual Weighted Mean Annual 98th Percentile Level: Level: Design Value Year: 2013

REPORT EXCLUDES MEASUREMENTS WITH REGIONALLY CONCURRED EVENT FLAGS. 15 35 State Name: District Of Columbia Site_ID / STREET ADDRESS | | | Cred. Days Comp. Qrtrs Wtd.

Mean 98th Perctil Cert&

Eval | | | Cred. Days Comp. Qrtrs 98th Perctil Wtd.

Mean Cert& Eval | | | Cred. Days Comp. Qrtrs 98th Perctil Wtd.

Mean Cert&

Eval | | | Design Value Valid

Ind. | | | Design Value Valid

Ind. 24-Hour Annual 2013 2012 2011

11-001-0041 11-001-0042 11-001-0043 420 34th Street N.E.,Washington, DC 20019 PARK SERVICES OFFICE 1100 OHIO DRIVE 2500 1ST STREET, N.W. WASHINGTON DC 287 77 354 3

1 4 21.0 18.7 23.7 *

* 9.1 8.5 9.5 *

* 331

111 366 4

4 4 27.8 24.3 23.8 9.8

9.8 9.7 344

115 354 4

4 4 24.7 26.2 24.8 10.4

10.2 10.2 25 23 24 N N Y 9.8

9.5 9.8 N N YUNITED STATES ENVIRONMENTAL PROTECTION AGENCY AIR QUALITY SYSTEM PRELIMINARY DESIGN VALUE REPORT Report Date: Jan. 8, 2014

Notes: 1. Computed design values are a snapshot of the data at the time the report was run (may not be all data for year). 2. Some PM2.5 24-hour DVs for incomplete data that are marked invalid here may be marked valid in the Official report due to additional analysis. 3. Annual Values not meeting completeness criteria are marked with an asterisk ('*'). Page 8 of 20 

### Pollutant: Standard Units: NAAQS Standard: Statistic: Statistic: Site-LevelPM2.5 - Local Conditions(88101) Micrograms/cubic meter (LC)(105) PM25 24-hour 2006 / PM25 Annual 2006 Annual Weighted Mean Annual 98th Percentile Level: Level: Design Value Year: 2008

REPORT EXCLUDES MEASUREMENTS WITH REGIONALLY CONCURRED EVENT FLAGS. 15 35 State Name: Maryland Site_ID / STREET ADDRESS | | | Cred. Days Comp. Qrtrs Wtd.

Mean 98th Perctil Cert&

Eval | | | Cred. Days Comp. Qrtrs 98th Perctil Wtd.

Mean Cert& Eval | | | Cred. Days Comp. Qrtrs 98th Perctil Wtd.

Mean Cert&

Eval | | | Design Value Valid

Ind. | | | Design Value Valid

Ind. 24-Hour Annual 2008 2007 2006

24-031-3001 24-033-0025 24-033-0030 24-033-8003 Lathrop E. Smith Environmental Education Center, 5110 Meadowside Lane Bladensburg Volunteer Fire Department, 4213 Edmondson Road Howard University's Beltsville Laboratory, 12003 Old Baltimore Pike PG County Equestrian Center, 14900 Pennsylvania Ave. 120 114 226 119 4

4 4 4 26.7 29.9 31.0 27.3 11.1

12.4 11.4 11.2 Y

Y Y 118 118 110 118 4

4 4 4 29.2 31.5 29.0 30.9 11.7

14.1 11.8 12.4 120

95 115 4

3 4 29.3

33.8 35.2 * 11.3

11.5 12.2 *

* 28

31 31 31 Y N N Y 11.4 13.3 11.6 11.9 Y

N N YUNITED STATES ENVIRONMENTAL PROTECTION AGENCY AIR QUALITY SYSTEM PRELIMINARY DESIGN VALUE REPORT Report Date: Jan. 8, 2014

Notes: 1. Computed design values are a snapshot of the data at the time the report was run (may not be all data for year). 2. Some PM2.5 24-hour DVs for incomplete data that are marked invalid here may be marked valid in the Official report due to additional analysis. 3. Annual Values not meeting completeness criteria are marked with an asterisk ('*'). Page 9 of 20 

### Pollutant: Standard Units: NAAQS Standard: Statistic: Statistic: Site-LevelPM2.5 - Local Conditions(88101) Micrograms/cubic meter (LC)(105) PM25 24-hour 2006 / PM25 Annual 2006 Annual Weighted Mean Annual 98th Percentile Level: Level: Design Value Year: 2009

REPORT EXCLUDES MEASUREMENTS WITH REGIONALLY CONCURRED EVENT FLAGS. 15 35 State Name: Maryland Site_ID / STREET ADDRESS | | | Cred. Days Comp. Qrtrs Wtd.

Mean 98th Perctil Cert&

Eval | | | Cred. Days Comp. Qrtrs 98th Perctil Wtd.

Mean Cert& Eval | | | Cred. Days Comp. Qrtrs 98th Perctil Wtd.

Mean Cert&

Eval | | | Design Value Valid

Ind. | | | Design Value Valid

Ind. 24-Hour Annual 2009 2008 2007

24-031-3001 24-033-0025 24-033-0030 24-033-8003 Lathrop E. Smith Environmental Education Center, 5110 Meadowside Lane Bladensburg Volunteer Fire Department, 4213 Edmondson Road Howard University's Beltsville Laboratory, 12003 Old Baltimore Pike PG County Equestrian Center, 14900 Pennsylvania Ave. 117 116 358 119 4

4 4 4 21.5 21.2 23.4 18.6 9.4

10.7 10.1 8.8 120

114 226 119 4

4 4 4 26.7 29.9 31.0 27.3 11.1

12.4 11.4 11.2 Y

Y Y 118 118 110 118 4

4 4 4 29.2 31.5 29.0 30.9 11.7

14.1 11.8 12.4 26 28 28 26 Y Y Y Y 10.7 12.4 11.1 10.8 Y

Y Y YUNITED STATES ENVIRONMENTAL PROTECTION AGENCY AIR QUALITY SYSTEM PRELIMINARY DESIGN VALUE REPORT Report Date: Jan. 8, 2014

Notes: 1. Computed design values are a snapshot of the data at the time the report was run (may not be all data for year). 2. Some PM2.5 24-hour DVs for incomplete data that are marked invalid here may be marked valid in the Official report due to additional analysis. 3. Annual Values not meeting completeness criteria are marked with an asterisk ('*'). Page 10 of 20 

### Pollutant: Standard Units: NAAQS Standard: Statistic: Statistic: Site-LevelPM2.5 - Local Conditions(88101) Micrograms/cubic meter (LC)(105) PM25 24-hour 2006 / PM25 Annual 2006 Annual Weighted Mean Annual 98th Percentile Level: Level: Design Value Year: 2010

REPORT EXCLUDES MEASUREMENTS WITH REGIONALLY CONCURRED EVENT FLAGS. 15 35 State Name: Maryland Site_ID / STREET ADDRESS | | | Cred. Days Comp. Qrtrs Wtd.

Mean 98th Perctil Cert&

Eval | | | Cred. Days Comp. Qrtrs 98th Perctil Wtd.

Mean Cert& Eval | | | Cred. Days Comp. Qrtrs 98th Perctil Wtd.

Mean Cert&

Eval | | | Design Value Valid

Ind. | | | Design Value Valid

Ind. 24-Hour Annual 2010 2009 2008

24-031-3001 24-033-0025 24-033-0030 24-033-8003 Lathrop E. Smith Environmental Education Center, 5110 Meadowside Lane Bladensburg Volunteer Fire Department, 4213 Edmondson Road Howard University's Beltsville Laboratory, 12003 Old Baltimore Pike PG County Equestrian Center, 14900 Pennsylvania Ave. 227 113 352 114 4

4 4 4 28.5 24.9 27.0 20.9 10.3

11.5 11.3 9.7 117

116 358 119 4

4 4 4 21.5 21.2 23.4 18.6 9.4

10.7 10.1 8.8 120

114 226 119 4

4 4 4 26.7 29.9 31.0 27.3 11.1

12.4 11.4 11.2 Y

Y Y 26

25 27 22 Y Y Y Y 10.3 11.5 11.0 9.9 Y Y Y YUNITED STATES ENVIRONMENTAL PROTECTION AGENCY AIR QUALITY SYSTEM PRELIMINARY DESIGN VALUE REPORT Report Date: Jan. 8, 2014

Notes: 1. Computed design values are a snapshot of the data at the time the report was run (may not be all data for year). 2. Some PM2.5 24-hour DVs for incomplete data that are marked invalid here may be marked valid in the Official report due to additional analysis. 3. Annual Values not meeting completeness criteria are marked with an asterisk ('*'). Page 11 of 20 

### Pollutant: Standard Units: NAAQS Standard: Statistic: Statistic: Site-LevelPM2.5 - Local Conditions(88101) Micrograms/cubic meter (LC)(105) PM25 24-hour 2006 / PM25 Annual 2006 Annual Weighted Mean Annual 98th Percentile Level: Level: Design Value Year: 2011

REPORT EXCLUDES MEASUREMENTS WITH REGIONALLY CONCURRED EVENT FLAGS. 15 35 State Name: Maryland Site_ID / STREET ADDRESS | | | Cred. Days Comp. Qrtrs Wtd.

Mean 98th Perctil Cert&

Eval | | | Cred. Days Comp. Qrtrs 98th Perctil Wtd.

Mean Cert& Eval | | | Cred. Days Comp. Qrtrs 98th Perctil Wtd.

Mean Cert&

Eval | | | Design Value Valid

Ind. | | | Design Value Valid

Ind. 24-Hour Annual 2011 2010 2009

24-031-3001 24-033-0025 24-033-0030 24-033-8003 Lathrop E. Smith Environmental Education Center, 5110 Meadowside Lane Bladensburg Volunteer Fire Department, 4213 Edmondson Road Howard University's Beltsville Laboratory, 12003 Old Baltimore Pike PG County Equestrian Center, 14900 Pennsylvania Ave. 331 108 345 114 3

4 4 4 25.2 22.6 25.5 21.1 * 10.9

10.1 10.9 8.9 * 227

113 352 114 4

4 4 4 28.5 24.9 27.0 20.9 10.3

11.5 11.3 9.7 117

116 358 119 4

4 4 4 21.5 21.2 23.4 18.6 9.4

10.7 10.1 8.8 25

23 25 20 N Y Y Y 10.2 10.8 10.8 9.1 N Y Y YUNITED STATES ENVIRONMENTAL PROTECTION AGENCY AIR QUALITY SYSTEM PRELIMINARY DESIGN VALUE REPORT Report Date: Jan. 8, 2014

Notes: 1. Computed design values are a snapshot of the data at the time the report was run (may not be all data for year). 2. Some PM2.5 24-hour DVs for incomplete data that are marked invalid here may be marked valid in the Official report due to additional analysis. 3. Annual Values not meeting completeness criteria are marked with an asterisk ('*'). Page 12 of 20 

### Pollutant: Standard Units: NAAQS Standard: Statistic: Statistic: Site-LevelPM2.5 - Local Conditions(88101) Micrograms/cubic meter (LC)(105) PM25 24-hour 2006 / PM25 Annual 2006 Annual Weighted Mean Annual 98th Percentile Level: Level: Design Value Year: 2012

REPORT EXCLUDES MEASUREMENTS WITH REGIONALLY CONCURRED EVENT FLAGS. 15 35 State Name: Maryland Site_ID / STREET ADDRESS | | | Cred. Days Comp. Qrtrs Wtd.

Mean 98th Perctil Cert&

Eval | | | Cred. Days Comp. Qrtrs 98th Perctil Wtd.

Mean Cert& Eval | | | Cred. Days Comp. Qrtrs 98th Perctil Wtd.

Mean Cert&

Eval | | | Design Value Valid

Ind. | | | Design Value Valid

Ind. 24-Hour Annual 2012 2011 2010

24-031-3001 24-033-0025 24-033-0030 24-033-8003 Lathrop E. Smith Environmental Education Center, 5110 Meadowside Lane Bladensburg Volunteer Fire Department, 4213 Edmondson Road Howard University's Beltsville Laboratory, 12003 Old Baltimore Pike PG County Equestrian Center, 14900 Pennsylvania Ave. 356

358 101 4

4 4 22.7

22.3 15.0 10.3

10.3 7.8 * S

S S 331 108 345 114 3

4 4 4 25.2 22.6 25.5 21.1 * 10.9

10.1 10.9 8.9 * 227

113 352 114 4

4 4 4 28.5 24.9 27.0 20.9 10.3

11.5 11.3 9.7 25

24 25 19 N N Y Y 10.5 10.8 10.8 8.8 N N Y YUNITED STATES ENVIRONMENTAL PROTECTION AGENCY AIR QUALITY SYSTEM PRELIMINARY DESIGN VALUE REPORT Report Date: Jan. 8, 2014

Notes: 1. Computed design values are a snapshot of the data at the time the report was run (may not be all data for year). 2. Some PM2.5 24-hour DVs for incomplete data that are marked invalid here may be marked valid in the Official report due to additional analysis. 3. Annual Values not meeting completeness criteria are marked with an asterisk ('*'). Page 13 of 20 

### Pollutant: Standard Units: NAAQS Standard: Statistic: Statistic: Site-LevelPM2.5 - Local Conditions(88101) Micrograms/cubic meter (LC)(105) PM25 24-hour 2006 / PM25 Annual 2006 Annual Weighted Mean Annual 98th Percentile Level: Level: Design Value Year: 2013

REPORT EXCLUDES MEASUREMENTS WITH REGIONALLY CONCURRED EVENT FLAGS. 15 35 State Name: Maryland Site_ID / STREET ADDRESS | | | Cred. Days Comp. Qrtrs Wtd.

Mean 98th Perctil Cert&

Eval | | | Cred. Days Comp. Qrtrs 98th Perctil Wtd.

Mean Cert& Eval | | | Cred. Days Comp. Qrtrs 98th Perctil Wtd.

Mean Cert&

Eval | | | Design Value Valid

Ind. | | | Design Value Valid

Ind. 24-Hour Annual 2013 2012 2011

24-031-3001 24-033-0025 24-033-0030 24-033-8003 Lathrop E. Smith Environmental Education Center, 5110 Meadowside Lane Bladensburg Volunteer Fire Department, 4213 Edmondson Road Howard University's Beltsville Laboratory, 12003 Old Baltimore Pike PG County Equestrian Center, 14900 Pennsylvania Ave. 290

283 82 3

3 3 18.4

20.5 17.2 *

*

* 7.7

8.8 8.1 *

*

*

* 356

358 101 4

4 4 22.7

22.3 15.0 10.3

10.3 7.8 * S

S S 331 108 345 114 3

4 4 4 25.2 22.6 25.5 21.1 * 10.9

10.1 10.9 8.9 * 22

23 23 18 N N N N 9.6 10.1 10.0 8.3 N N N NUNITED STATES ENVIRONMENTAL PROTECTION AGENCY AIR QUALITY SYSTEM PRELIMINARY DESIGN VALUE REPORT Report Date: Jan. 8, 2014

Notes: 1. Computed design values are a snapshot of the data at the time the report was run (may not be all data for year). 2. Some PM2.5 24-hour DVs for incomplete data that are marked invalid here may be marked valid in the Official report due to additional analysis. 3. Annual Values not meeting completeness criteria are marked with an asterisk ('*'). Page 14 of 20 

### Pollutant: Standard Units: NAAQS Standard: Statistic: Statistic: Site-LevelPM2.5 - Local Conditions(88101) Micrograms/cubic meter (LC)(105) PM25 24-hour 2006 / PM25 Annual 2006 Annual Weighted Mean Annual 98th Percentile Level: Level: Design Value Year: 2008

REPORT EXCLUDES MEASUREMENTS WITH REGIONALLY CONCURRED EVENT FLAGS. 15 35 State Name: Virginia Site_ID / STREET ADDRESS | | | Cred. Days Comp. Qrtrs Wtd.

Mean 98th Perctil Cert&

Eval | | | Cred. Days Comp. Qrtrs 98th Perctil Wtd.

Mean Cert& Eval | | | Cred. Days Comp. Qrtrs 98th Perctil Wtd.

Mean Cert&

Eval | | | Design Value Valid

Ind. | | | Design Value Valid

Ind. 24-Hour Annual 2008 2007 2006

51-013-0020 S 18TH AND HAYES ST 119 4 27.9 12.0 120 4 29.5 13.8 120 4 32.5 12.9 Y 30 Y 12.9 YUNITED STATES ENVIRONMENTAL PROTECTION AGENCY AIR QUALITY SYSTEM PRELIMINARY DESIGN VALUE REPORT Report Date: Jan. 8, 2014

Notes: 1. Computed design values are a snapshot of the data at the time the report was run (may not be all data for year). 2. Some PM2.5 24-hour DVs for incomplete data that are marked invalid here may be marked valid in the Official report due to additional analysis. 3. Annual Values not meeting completeness criteria are marked with an asterisk ('*'). Page 15 of 20 

### Pollutant: Standard Units: NAAQS Standard: Statistic: Statistic: Site-LevelPM2.5 - Local Conditions(88101) Micrograms/cubic meter (LC)(105) PM25 24-hour 2006 / PM25 Annual 2006 Annual Weighted Mean Annual 98th Percentile Level: Level: Design Value Year: 2009

REPORT EXCLUDES MEASUREMENTS WITH REGIONALLY CONCURRED EVENT FLAGS. 15 35 State Name: Virginia Site_ID / STREET ADDRESS | | | Cred. Days Comp. Qrtrs Wtd.

Mean 98th Perctil Cert&

Eval | | | Cred. Days Comp. Qrtrs 98th Perctil Wtd.

Mean Cert& Eval | | | Cred. Days Comp. Qrtrs 98th Perctil Wtd.

Mean Cert&

Eval | | | Design Value Valid

Ind. | | | Design Value Valid

Ind. 24-Hour Annual 2009 2008 2007

51-013-0020 S 18TH AND HAYES ST 118 4 23.2 10.1 119 4 27.9 12.0 120 4 29.5 13.8 27 Y 11.9 YUNITED STATES ENVIRONMENTAL PROTECTION AGENCY AIR QUALITY SYSTEM PRELIMINARY DESIGN VALUE REPORT Report Date: Jan. 8, 2014

Notes: 1. Computed design values are a snapshot of the data at the time the report was run (may not be all data for year). 2. Some PM2.5 24-hour DVs for incomplete data that are marked invalid here may be marked valid in the Official report due to additional analysis. 3. Annual Values not meeting completeness criteria are marked with an asterisk ('*'). Page 16 of 20 

### Pollutant: Standard Units: NAAQS Standard: Statistic: Statistic: Site-LevelPM2.5 - Local Conditions(88101) Micrograms/cubic meter (LC)(105) PM25 24-hour 2006 / PM25 Annual 2006 Annual Weighted Mean Annual 98th Percentile Level: Level: Design Value Year: 2010

REPORT EXCLUDES MEASUREMENTS WITH REGIONALLY CONCURRED EVENT FLAGS. 15 35 State Name: Virginia Site_ID / STREET ADDRESS | | | Cred. Days Comp. Qrtrs Wtd.

Mean 98th Perctil Cert&

Eval | | | Cred. Days Comp. Qrtrs 98th Perctil Wtd.

Mean Cert& Eval | | | Cred. Days Comp. Qrtrs 98th Perctil Wtd.

Mean Cert&

Eval | | | Design Value Valid

Ind. | | | Design Value Valid

Ind. 24-Hour Annual 2010 2009 2008

51-013-0020 S 18TH AND HAYES ST 108 3 21.8* 10.3* 118 4 23.2 10.1 119 4 27.9 12.0 24 N 10.8 NUNITED STATES ENVIRONMENTAL PROTECTION AGENCY AIR QUALITY SYSTEM PRELIMINARY DESIGN VALUE REPORT Report Date: Jan. 8, 2014

Notes: 1. Computed design values are a snapshot of the data at the time the report was run (may not be all data for year). 2. Some PM2.5 24-hour DVs for incomplete data that are marked invalid here may be marked valid in the Official report due to additional analysis. 3. Annual Values not meeting completeness criteria are marked with an asterisk ('*'). Page 17 of 20 

### Pollutant: Standard Units: NAAQS Standard: Statistic: Statistic: Site-LevelPM2.5 - Local Conditions(88101) Micrograms/cubic meter (LC)(105) PM25 24-hour 2006 / PM25 Annual 2006 Annual Weighted Mean Annual 98th Percentile Level: Level: Design Value Year: 2011

REPORT EXCLUDES MEASUREMENTS WITH REGIONALLY CONCURRED EVENT FLAGS. 15 35 State Name: Virginia Site_ID / STREET ADDRESS | | | Cred. Days Comp. Qrtrs Wtd.

Mean 98th Perctil Cert&

Eval | | | Cred. Days Comp. Qrtrs 98th Perctil Wtd.

Mean Cert& Eval | | | Cred. Days Comp. Qrtrs 98th Perctil Wtd.

Mean Cert&

Eval | | | Design Value Valid

Ind. | | | Design Value Valid

Ind. 24-Hour Annual 2011 2010 2009

51-013-0020 S 18TH AND HAYES ST 58 2 21.2* 9.9* 108 3 21.8 * 10.3 * 118 4 23.2 10.1 22 N 10.1 NUNITED STATES ENVIRONMENTAL PROTECTION AGENCY AIR QUALITY SYSTEM PRELIMINARY DESIGN VALUE REPORT Report Date: Jan. 8, 2014

Notes: 1. Computed design values are a snapshot of the data at the time the report was run (may not be all data for year). 2. Some PM2.5 24-hour DVs for incomplete data that are marked invalid here may be marked valid in the Official report due to additional analysis. 3. Annual Values not meeting completeness criteria are marked with an asterisk ('*'). Page 18 of 20 

### Pollutant: Standard Units: NAAQS Standard: Statistic: Statistic: Site-LevelPM2.5 - Local Conditions(88101) Micrograms/cubic meter (LC)(105) PM25 24-hour 2006 / PM25 Annual 2006 Annual Weighted Mean Annual 98th Percentile Level: Level: Design Value Year: 2012

REPORT EXCLUDES MEASUREMENTS WITH REGIONALLY CONCURRED EVENT FLAGS. 15 35 State Name: Virginia Site_ID / STREET ADDRESS | | | Cred. Days Comp. Qrtrs Wtd.

Mean 98th Perctil Cert&

Eval | | | Cred. Days Comp. Qrtrs 98th Perctil Wtd.

Mean Cert& Eval | | | Cred. Days Comp. Qrtrs 98th Perctil Wtd.

Mean Cert&

Eval | | | Design Value Valid

Ind. | | | Design Value Valid

Ind. 24-Hour Annual 2012 2011 2010

51-013-0020 S 18TH AND HAYES ST 121 4 21.8 9.4 58 2 21.2 * 9.9 * 108 3 21.8* 10.3* 22 N 9.9 NUNITED STATES ENVIRONMENTAL PROTECTION AGENCY AIR QUALITY SYSTEM PRELIMINARY DESIGN VALUE REPORT Report Date: Jan. 8, 2014

Notes: 1. Computed design values are a snapshot of the data at the time the report was run (may not be all data for year). 2. Some PM2.5 24-hour DVs for incomplete data that are marked invalid here may be marked valid in the Official report due to additional analysis. 3. Annual Values not meeting completeness criteria are marked with an asterisk ('*'). Page 19 of 20 

### Pollutant: Standard Units: NAAQS Standard: Statistic: Statistic: Site-LevelPM2.5 - Local Conditions(88101) Micrograms/cubic meter (LC)(105) PM25 24-hour 2006 / PM25 Annual 2006 Annual Weighted Mean Annual 98th Percentile Level: Level: Design Value Year: 2013

REPORT EXCLUDES MEASUREMENTS WITH REGIONALLY CONCURRED EVENT FLAGS. 15 35 State Name: Virginia Site_ID / STREET ADDRESS | | | Cred. Days Comp. Qrtrs Wtd.

Mean 98th Perctil Cert&

Eval | | | Cred. Days Comp. Qrtrs 98th Perctil Wtd.

Mean Cert& Eval | | | Cred. Days Comp. Qrtrs 98th Perctil Wtd.

Mean Cert&

Eval | | | Design Value Valid

Ind. | | | Design Value Valid

Ind. 24-Hour Annual 2013 2012 2011

51-013-0020 S 18TH AND HAYES ST 112 3 18.5* 8.7* 121 4 21.8 9.4 58 2 21.2* 9.9* 21 N 9.4 NUNITED STATES ENVIRONMENTAL PROTECTION AGENCY AIR QUALITY SYSTEM PRELIMINARY DESIGN VALUE REPORT Report Date: Jan. 8, 2014

Notes: 1. Computed design values are a snapshot of the data at the time the report was run (may not be all data for year). 2. Some PM2.5 24-hour DVs for incomplete data that are marked invalid here may be marked valid in the Official report due to additional analysis. 3. Annual Values not meeting completeness criteria are marked with an asterisk ('*'). Page 20 of 20 M

N

S

U

X

Y The monitoring organization has revised data from this monitor since the

most recent certification letter received from the state. The certifying agency has submitted the certification letter and required summary reports, but the certifying agency and/or EPA has determined that issues regarding the quality of the ambient concentration data cannot be resolved due to data completeness, the lack of performed quality assurance checks or the results of uncertainty statistics shown in the AMP255 report or the certification and quality assurance report. The certifying agency has submitted the certification letter and required summary reports. A value of "S" conveys no Regional assessment regarding data quality per se. This flag will remain until the Region provides an "N" or "Y" concurrence flag. Uncertified. The certifying agency did not submit a required certification letter and summary reports for this monitor even though the due date has passed, or the state's certification letter specifically did not apply the certification to this monitor. Certification is not required by 40 CFR 58.15 and no conditions apply to be the basis for assigning another flag value The certifying agency has submitted a certification letter, and EPA has no unresolved reservations about data quality (after reviewing the letter, the attached summary reports, the amount of quality assurance data submitted to AQS, the quality statistics, and the highest reported concentrations). MEANING CERTIFICATION EVALUATION AND CONCURRENCE FLAG MEANINGS

FLAG