1. Air Quality Monitoring in Manhattan, NY
Dan Vallero

2. Example of Measurement Results in Lower Manhattan following WTC Collapse
Particle/fibers
SVOCs
VOCs

3. Sampling Approach at WTC
Screening level approach to identify chemical species in air and bulk dust which may be of human health concern
Three air monitoring sites ~ 100 m around Ground Zero
24-hour PM2.5 samples and grab samples for volatile organic compounds (VOCs)
Air monitoring site established at 290 Broadway on 16th floor with same measurements as Ground Zero
Also, semi-volatile organic compounds (SVOCs); continuous measurements of elemental carbon, particle sizing and particle counts
Settled dust collected at Ground Zero to determine dioxin concentrations and elemental composition of dust
Additional monitoring sites away from Ground Zero (AC Power) to measure dioxins and furans in the air.

4. View from sampling sites

5. AQ Team’s Monitoring SitesK

6. Nephelometers at WTC
Time trace of 1848 ten-minute averages shows moderate levels of light scattering punctuated by periods of high to very high scattering, as would be expected near a source of dust and with variable wind speeds and directions

7. Scanning Electron Microscopy at WTC
Evidence of the fibrous nature of the particles is presented, which show three randomly selected fields of view taken at low magnification.

8. SEM at WTC (cont’d)

9. SEM at WTC (cont’d)

10. Individual WTC fiber analysis by SEM
Bulk material quite fibrous and tended to aggregate into large clumps

11. Morphology and Chemical Composition of WTC Fibers
SEM is not the definitive or sole method for identifying asbestos
Unlikely that the fibers found in this particular sample are asbestos fibers, based on their variable size and chemical composition.

12. WTC Fiber Characterization
Most particles or fibers of Ca-S or Ca-Si-Al-Mg-S composition, similar to that of plaster or wallboard
Ranged in diameter between approximately 1 and 10 μm

13. Particles < 10 μm diameter
Most particles less than 10 μm in diameter had compositions similar to the fibers
Likely to have originated from the same building materials.

14. Particles < 10 μm diameter
Some metals including Fe and Zn, were also found.

15. Aethalometer Black Carbon Composition of WTC Particles

16. Aethalometer Black Carbon Composition of WTC Particles

17. Black Carbon Diurnal Variability

18. SVOCs at WTC (PAHs_

19. Airborne Total Dioxins

20. Benzene Grab Samples

21. The Urban Dispersion Program (UDP) NYC MSG05 Experiment: The Participation and Collaboration of US EPA, NERL and EOHSI
Investigators: EOHSI – P. J. Lioy, PhD
and P.G. Georgopoulos, PhD
EPA - Gary Foley, PhD, Jerry Blancato, PhD
James Daloia, Ph.D., Dan Vallero, PhD
March, 2005
Participating organizations: NOAA, DHS, DARPA, NYCOEM, EPA Region II,
Brookhaven National Laboratory, Battelle Northwest, Private Consultants O

22. Goals of MSG05 Understand flow and dispersion in a deep urban canyon.
Understand rapid vertical transport and dispersion in re-circulating eddies adjacent to very tall buildings.
Complete tracer experiments with concurrent detailed meteorology to improve he above, and develop and evaluate dispersion models.
Obtain a high quality field data that will be distributed to others.
Improve design of future field experiments in NYC.
Understand the concentration distribution of and personal exposure to the tracers at the surface and indoors away from release points.

23. Study design There were:
two one-hour continuous releases, separated by a one and one-half hour interval with no release,
pattern selected because
1) there were ten sequential “bags” in the PFT samplers,
2) a 30-minute averaging time was optimum for continuous releases,
3) the concentrations are expected to decrease significantly (by at least one or two orders of magnitude) during the “no-release” interval so that the two clouds can be distinguished by the samplers.
The six-hour sampling period was from 9 am to 2 pm ( the part of day when stabilities are fairly constant at nearly-neutral).
Two days of experiments were completed in MSG05 –
March 10 and 14,

26. Approach to Exposure Characterization Study in MSG05
The EPA and EOHSI jointly designed a personal exposure characterization experiment that ran concurrently with the other measurements completed within MSG05 on 3/10/2005

27. Goals of the Exposure Characterization
Quantify the levels of exposure to PFT’s, using the personal BNL-PFT monitors within:
the near field, <20m, of an MSG release point
areas >20m from an MSG release point
Define specific outdoor and indoor activity patterns used by volunteers (12) during a two hour time period after a release of the PFT’s
Each pattern was intended to represent a different pre- or post-release activity scenarios

28. Goals of the Exposure Characterization (continued)
3. Examine the field results for the patterns of PFT emissions and the activities of the personal monitoring volunteer
one or ten minute integrated personal PFT samples will be collected during each 1 hour release period
collection will also occur during the hour immediately after a release period
4. Construct personal exposure profiles for each person and for each release event
examine for coherence in location/time with the stationary dispersion monitoring/MSG05 dispersion modeling results

29. Goals of the Exposure Characterization (continued)
5. Employ the exposure measurements within the Modeling Environment for Total Risk (MENTOR) system using its Individual Based Exposure Modeling (IBEM) framework to
Evaluate and refine exposure/dose characterization for individuals affected by emergency events involving atmospheric release of hazardous agents
Use the personal monitoring results and activities of volunteer to improve simulations of exposures for emergency events
Use the personal monitoring results to improve modules in MENTOR individual exposures associated with emergency events

30. Goals of the Exposure Characterization (continued)
Provide results that can be used to develop response and interdiction activities to mitigate casualties and protect emergency responders
Yield a better sense of what may be encountered after an attack
Identify what must be done to protect emergency responders while being in harms way
7. Apply near field exposure/concentrate data to help evaluate the predictions of air movement in street canyons around MSG by meteorological models