Skip to content U.S. Department of Transportation/Federal Highway AdministrationU.S. Department of Transportation/Federal Highway Administration

Office of Planning, Environment, & Realty (HEP)
PlanningEnvironmentReal Estate

HEP Events Guidance Publications Awards Contacts

FHWA and EPA National Near-Road Study Las Vegas

25 Appendix - Integrated Sample Data - Cartridges

SAS Dataset

December 15, 2008 thru December 16, 2009

Acetaldehyde

 

SampleType

# of Samples

% by Sample Type

# of Samples w/ No Sample Collection Errors/ Warnings (Flag_ Acetaldehyde = 0)

% of Samples w/ No Sample Collection Errors/ Warnings (Flag_ Acetaldehyde = 0)

# of Samples w/ Sample Collection Errors/ Warnings (Flag_ Acetaldehyde = 1)

% of Samples w/ Sample Collection Errors/ Warnings (Flag_ Acetaldehyde = 1)

Field Blank

67

5

53

4

14

1

Field Control

72

5

51

4

21

1

Field Dup

67

5

33

2

34

2

Lab Dup

2

0

0

0

2

0

Sample

1211

85

832

59

379

27

Total

1419

 

969

 

450

 
       
       

Formaldehyde

      

SampleType

# of Samples

% by Sample Type

# of Samples w/ No Sample Collection Errors/ Warnings (Flag_ Formaldehyde = 0)

% of Samples w/ No Sample Collection Errors/ Warnings (Flag_ Formaldehyde = 0)

# of Samples w/ Sample Collection Errors/ Warnings (Flag_ Formaldehyde = 1)

% of Samples w/ Sample Collection Errors/ Warnings (Flag_ Formaldehyde = 1)

Field Blank

67

5

53

4

14

1

Field Control

72

5

51

4

21

1

Field Dup

67

5

33

2

34

2

Lab Dup

2

0

0

0

2

0

Sample

1211

85

832

59

379

27

Total

1419

 

969

 

450

 

Acrolein

      

SampleType

# of Samples

% by Sample Type

# of Samples w/ No Sample Collection Errors/

Warnings (Flag_ Acrolein = 0)

% of Samples w/ No Sample Collection Errors/ Warnings (Flag_ Acrolein = 0)

# of Samples w/ Sample Collection Errors/ Warnings (Flag_ Acrolein = 1)

% of Samples w/ Sample Collection Errors/ Warnings (Flag_ Acrolein = 1)

Field Blank

67

5

53

4

14

1

Field Control

72

5

51

4

21

1

Field Dup

67

5

33

2

34

2

Lab Dup

2

0

0

0

2

0

Sample

1211

85

832

59

379

27

Total

1419

 

969

 

450

 

Variables for Carbonyl Data (samples collected using cartridges: Method TO-11A). id = station1, station2, station3, station4 location = 10 meter, 100 meter, 300 meter, Upwind SampleType = Field Blank, Field Control, Field Duplicate, Lab Duplicate, Sample SampleDateTime = Date and Time of Sample

Acetaldehyde = µg/m3

Acrolein = µg/m3

Formaldehyde = µg/m3

BATCH = batch number of DNSH cartridge

Flag_Carbonyl = 0 or 1; 0 = valid data; 1 = invalid data (relates to the entire sample, across all pollutants) Flag_Acetaldehyde = 0 or 1; 0 = valid data; 1 = invalid data Flag_Acrolein = 0 or 1; 0 = valid data; 1 = invalid data Flag_Formaldehyde = 0 or 1; 0 = valid data; 1 = invalid data Data_Review_Comment = text field

Acetaldehyde_mdl = method detection limit for acetaldehyde (µg/m3)

Acrolein_mdl = method detection limit for acrolein µg/m3

Formaldehyde_mdl = method detection limit for formaldehyde (µg/m3)

Acetaldehyde_ppb = Acetaldehyde (ppb) (uncorrected for background) Acrolein_ppb = Acrolein (ppb) (uncorrected for background) Formaldehyde_ppb = Formaldehyde (ppb) (uncorrected for background) Acetaldehyde_ppb_mdl = Acetaldehyde (ppb) method detection limit Acrolein_ppb_mdl = Acrolein (ppb) method detection limit Formaldehyde_ppb_mdl = Formaldehyde (ppb) method detection limit

Acetaldehyde_detect = 0 or 1; 0 = method detection limit value substitution (only occurs when measured value – background = negative value); 1 = actual value Acrolein_detect = 0 or 1; 0 = method detection limit value substitution (only occurs when measured value – background = negative value); 1 = actual value Formaldehyde_detect = 0 or 1; 0 = method detection limit substitution; 1 = below method detection limit

Acetaldehyde_BL = Acetaldehyde (µg/m3) background value

Acetaldehyde_ppb_BL = Acetaldehyde (ppb) background value

Acrolein_BL = Acrolein (µg/m3) background value

Acrolein_ppb_BL = Acrolein (ppb) background value

Acetaldehyde_BLCorrected = Acetaldehyde background corrected (µg/m3)

Acrolein_BLCorrected = Acrolein background corrected (µg/m3)

Acetaldehyde_ppb_BLCorrected = Acetaldehyde (ppb) background corrected

Acrolein_ppb_BLCorrected = Acrolein (ppb) background corrected

fcom = text field (field comment)


[1] The boundary of the box closest to zero indicates the 25th percentile, the line within the box marks the median, and the boundary of the box farthest from zero indicates the 75th percentile. Whiskers (error bars) above and below the box indicate the 90th and 10th percentiles. Points above the whiskers are outliers. The red line within the box marks the mean.

[2] Arrows in bottom image of Figure 28and Figure 29 point to the direction to where the wind is traveling. Arrow pointing up means “winds from the south”, arrow pointing to the right means “wind from the west”, or downwind of the highway.

[3] Image four in Figure 29 shows traffic volume. Note that during this time period (July 5-11, 2009) traffic volume is showing greater variability than might be otherwise expected. This is evident during late July 7 – early July 8, 2009 possible due to traffic sensor problems.

[4] Outliers exceeding the maximum y-axis are not shown in Figure 45.

Updated: 05/21/2013
HEP Home Planning Environment Real Estate
Federal Highway Administration | 1200 New Jersey Avenue, SE | Washington, DC 20590 | 202-366-4000