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Thomas, K., J. Xue, R. Williams, P. Jones, AND D. Whitaker. Polychlorinated biphenyl sources, environmental levels, and exposures in school buildings. ISES 2015 Annual Meeting, Henderson, NV, October 18 - 22, 2015.

Conner, T., L. Cernikovsky, J. Novak, AND R. Williams. Source apportionment with uncertainty estimates of PM2.5 in Ostrava, Czech Republic using Positive Matrix Factorization. 2015 European Aerosol Conference, Milan, ITALY, September 10, 2015.

Williams, R., A. Kaufman, AND S. Garvey. TOXIRAE PRO PID. U.S. Environmental Protection Agency, Washington, DC, EPA/600/R-15/124 (NTIS PB2015-105135), 2015.

Kaufman, A., R. Williams, T. Barzyk, M. OShea, A. Hoang, P. Sheridan, AND M. Greenberg. The Air Sensor Citizen Science Toolbox: A Collaboration in Community Air Quality Monitoring and Mapping. Citizen Science 2015 Conference, San Jose, CA, February 11 - 12, 2015.

Williams, R., A. Kaufman, AND S. Garvey. UNITEC SENS-IT. U.S. Environmental Protection Agency, Washington, DC, EPA/600/R-15/119 (NTIS PB2015-105132), 2015.

Williams, R., D. Costa, A. Brown, A. Kaufman, D. Buchbinder, G. Hagler, E. Thoma, Bill Mitchell, B. Gullett, W. Jiao, Vasu Kilaru, R. Long, M. Beaver, R. Duvall, P. Solomon, K. Leovic, E. Smith, L. Stanek, Tim Watkins, P. Preuss, S. Katz, G. Robarge, E. Snyder, B. Sharpe, AND S. Garvey. #2) Sensor Technology-State of the Science. Webinar Presentation - Sensor Technology-State of the Science, Research Triangle Park, NC, July 08, 2014.

Williams, R., Vasu Kilaru, E. Snyder, A. Kaufman, T. Dye, A. Rutter, A. Russell, AND H. Hafner. Air Sensor Guidebook. U.S. Environmental Protection Agency, Washington, DC, EPA/600/R-14/159 (NTIS PB2015-100610), 2014.

Hammond, D., C. Croghan, H. Shin, R. Burnette, R. Bard, R. Brook, AND R. Williams. Cardiovascular impacts and micro-environmental exposure factors associated with continuous personal PM2.5 monitoring. Journal of Exposure Science and Environmental Epidemiology . Nature Publishing Group, London, Uk, 24(4):337-345, (2014).

Kaufman, A., R. Williams, T. Barzyk, AND Tim Watkins. Citizen Science and Emerging Technologies. Presented at US Public Health Service Scientific and Training Symposium, Raleigh, NC, June 10 - 12, 2014.

Holliday, K., C. Avery, C. Poole, K. McGraw, R. Williams, D. Liao, R. Smith, AND E. Whitsel. Estimating Personal Exposures from Ambient Air Pollution Measures - Using Meta-Analysis to Assess Measurement Error. EPIDEMIOLOGY. Lippincott Williams & Wilkins, Philadelphia, PA, 25(1):35-36, (2014).

Williams, R., A. Kaufman, T. Hanley, J. Rice, AND S. Garvey. Evaluation of Field-deployed Low Cost PM Sensors. U.S. Environmental Protection Agency, Washington, DC, EPA/600/R-14/464 (NTIS PB 2015-102104), 2014.

Kioumourtzoglou, M., D. Spiegelman, A. Szpiro, L. Sheppard, J. Kaufman, J. Yanosky, R. Williams, F. Laden, B. Hong, AND H. Suh. Exposure Measurement Error in PM2.5 Health Effects Studies: A Pooled Analysis of Eight Personal Exposure Validation Studies. ENVIRONMENTAL HEALTH PERSPECTIVES. National Institute of Environmental Health Sciences (NIEHS), Research Triangle Park, NC, 13(2):1-11, (2014).

Thomas, K., J. Xue, R. Williams, Paul-A Jones, AND D. Whitaker. Exposure Modeling for Polychlorinated Biphenyls in School Buildings. 8th International PCB Workshop, Woods Hole, MA, October 05 - 09, 2014.

Breen, M., T. Long, Brad Schultz, J. Crooks, M. Breen, J. Langstaff, K. Isaacs, C. Tan, R. Williams, Y. Cao, A. Geller, R. Devlin, S. Batterman, AND T. Buckley. GPS-based Microenvironment Tracker (MicroTrac) Model to Estimate Time-Location of Individuals for Air Pollution Exposure Assessments: Model Evaluation in Central North Carolina. ATMOSPHERIC ENVIRONMENT. Elsevier Science Ltd, New York, NY, 24(4):412-420, (2014).

Tulve, N., K. Isaacs, R. Williams, T. McCurdy, L. Phillips, C. Croghan, AND H. Ozkaynak. How Questionnaires and Multimedia Measurements collected in the U.S. EPA’s Observational Human Exposure Measurement Studies Inform Exposures. ISES 2014 Annual Meeting, Cincinnati, OH, October 12 - 16, 2014.

Williams, R. ISES Training Class - Continuous Measurements. 2014 International Society of Exposure Science, Cincinnati, OH, October 12 - 16, 2014.

Willis, R., L. Cernikovsky, T. Conner, J. Novak, H. Placa, B. Krejei, I. Nikolova, E. Chalupniekova, AND R. Williams. Identifying the Sources Contributing to PM Exceedances in Ostrava, Czech Republic, Using Passive Aerosol Sampling Coupled with Computer-Controlled Microscopy. Presented at Dust 2014 International Conference on Atmospheric Dust, Castellaneta Marina, ITALY, June 01 - 06, 2014.

Williams, R., Tim Watkins, AND R. Long. Low Cost Sensor Calibration Options. EM: AIR AND WASTE MANAGEMENT ASSOCIATION'S MAGAZINE FOR ENVIRONMENTAL MANAGERS. Air & Waste Management Association, Pittsburgh, PA, , 10-15, (2014).

MacDonnell, M., M. Raymond, D. Wyker, M. Finster, Y. Chang, T. Raymond, B. Temple, M. Scofield, D. Vallano, E. Snyder, AND R. Williams. Mobile Sensors and Applications for Air Pollutants. U.S. Environmental Protection Agency, Washington, DC, EPA/600/R-14/051 (NTIS PB2014 105955), 2014.

Williams, R., R. Long, M. Beaver, R. Duvall, Sue Kimbrough, E. Thoma, Bill Mitchell, J. Rice, T. Hanley, AND S. Garvey. Observations from Laboratory and Field-based Evaluations of Select Low Cost Sensor Performance. 2014 International Society of Exposure Science, Cincinnati, OH, October 12 - 16, 2014.

Long, R., M. Beaver, R. Williams, K. Kronmiller, AND S. Garvey. Procedures and Concepts of EPA's Ongoing Sensor Evaluation Efforts. EM: AIR AND WASTE MANAGEMENT ASSOCIATION'S MAGAZINE FOR ENVIRONMENTAL MANAGERS. Air & Waste Management Association, Pittsburgh, PA, , 8-9, (2014).

Stevens, C., R. Williams, AND Paul-A Jones. Progress and Understanding Spatial and Temporal Variability of PM2.5 and its Components in the Detroit Exposure and Aerosol Research Study (DEARS). JOURNAL OF ENVIRONMENTAL MONITORING. Royal Society of Chemistry, Cambridge, Uk, 16(1):94-105, (2014).

Breen, M., Brad Schultz, M. Sohn, T. Long, J. Langstaff, R. Williams, K. Isaacs, Q. Meng, C. Stallings, AND L. Smith. Review of Air Exchange Rate Models for Air Pollution Exposure Assessments. Journal of Exposure Science and Environmental Epidemiology . Nature Publishing Group, London, Uk, 24(6):555-563, (2014).

Williams, R., R. Long, M. Beaver, A. Kaufman, F. Zeiger, M. Heimbinder, I. Hang, R. Yap, B. Acharya, B. Ginwald, K. Kupcho, S. Robinson, O. Zaouak, B. Aubert, M. Hannigan, R. Piedrahita, N. Masson, B. Moran, M. Rook, P. Heppner, C. Cogar, N. Nikzad, AND W. Griswold. Sensor Evaluation Report. U.S. Environmental Protection Agency, Washington, DC, EPA/600/R-14/143 (NTIS PB2015-100611), 2014.

Williams, R., R. Long, M. Beaver, G. Hagler, Sue Kimbrough, E. Thoma, Bill Mitchell, T. Hanley, J. Rice, S. Garvey, B. Sharpe, W. Jiao, AND K. Kronmiller. Sensor Technology Performance Characteristics- Field and Laboratory Observations. 2014 Air Sensors Workshop, Research Triangle Park, NC, June 09 - 10, 2014.