1. Supplemental Information Page number / range
Table S1: Summary of meteorological data and period information 2
Figure Set S1: Passive sampler (PS) site information and deployment photos
Figure S2: Passive sampler (PS) hardware photos
Figure S3: SPod and Sentinel sensor photos
Figure S4: UV DOAS optical remote sensing equipment photos 23
Figure S6: UV DOAS detection limit figure
Figure S7: UV DOAS benzene field and reference spectra
Figure Set S5: SPod and Sentinel sensor data for Period

3. Supplemental Figure Set S1
Passive sampler (PS) site information and deployment photos

4. PS Site 1

5. PS Site 2

6. PS Site 3

7. PS Site 4

8. PS Site 5

9. PS Site 6

10. PS Site 7

11. PS Site 8

12. PS Site 9

13. PS Site 10
After heavy rain, standing water not typical.

14. PS Site 11

15. PS Site 12

16. PS Site 13

17. PS Site 14

18. PS Site 15

19. PS Site 16
discontinued due to vandalism

20. PS Site 17

26. Supplemental Figure Set S5 Pages: 26 - 41
Raw SPod PID Signal (V)
Raw Sentinel PID Signal (v)
Date (Mo. Day) Time (Hr:Min)
Emission Signal
Baseline Drift
Supplemental Figure Set S5 Pages:
Page 26 shows the raw PID signal from the SPod and Sentinel for 11/5/14, the first day of the two week PS period #34. The slowly varying baseline drift is mathematically fit by the blue line.
The baseline-corrected PID signal for 11/5/14 is shown in on page 27 with the remaining days of period 34 shown on subsequent pages.
Note: The baseline-correction removes both instrument drift and signals from slowly varying background concentrations. The baseline-corrected PID signal may not reflect impacts from distant or weak facility sources, or from air pollutants that build up over time under stagnant meteorological conditions.
Time periods where the sensors were not operating are indicated.

27. 11/05/2014
Supplemental Figure Set 5: Baseline-corrected sensor data for Period 34

28. 11/06/2014 Sensors off-line Sensors off-scale low
Supplemental Figure Set 5: Baseline-corrected sensor data for Period 34

29. 11/07/2014 Sensors off-scale low
Supplemental Figure Set 5: Baseline-corrected sensor data for Period 34

30. 11/08/2014
Supplemental Figure Set 5: Baseline-corrected sensor data for Period 34

31. 11/09/2014
Supplemental Figure Set 5: Baseline-corrected sensor data for Period 34

32. 11/10/2014
Sensors
off-line
Supplemental Figure Set 5: Baseline-corrected sensor data for Period 34

33. 11/11/2014 Sensors off-scale low
Supplemental Figure Set 5: Baseline-corrected sensor data for Period 34

34. 11/12/2014 Sensors off-scale low
Supplemental Figure Set 5: Baseline-corrected sensor data for Period 34

35. 11/13/2014
Sensors
off-line
Supplemental Figure Set 5: Baseline-corrected sensor data for Period 34

36. 11/14/2014
Sensors
off-line
Supplemental Figure Set 5: Baseline-corrected sensor data for Period 34

37. 11/15/2014
Supplemental Figure Set 5: Baseline-corrected sensor data for Period 34

38. 11/16/2014
Supplemental Figure Set 5: Baseline-corrected sensor data for Period 34

39. 11/17/2014 Sensors off-scale low
Supplemental Figure Set 5: Baseline-corrected sensor data for Period 34

40. 11/18/2014
Supplemental Figure Set 5: Baseline-corrected sensor data for Period 34

41. 11/19/2014
Supplemental Figure Set 5: Baseline-corrected sensor data for Period 34