Gradient

Senior Scientists

Nicole L. Briggs, Ph.D.
Email VCard Bio

Education

Ph.D., Atmospheric Sciences, University of Washington

B.A., Geography, University of Washington

Expertise

  • Exposure Assessment
  • Air Dispersion Modeling
  • Air Quality Monitoring
  • Sources, Sinks, and Transport of Air Pollutants
  • Climate Science

Nicole L. Briggs, Ph.D.

Senior Air Quality Scientist

Email VCard Bio

Dr. Briggs is an atmospheric chemist with expertise in air quality measurements and modeling, climate science, and pollutant fate and transport.  She has a background in US and international air quality regulations, and has worked extensively on projects related to the US National Ambient Air Quality Standards.  At Gradient, she focuses on evaluating air quality, climate, and meteorological data; modeling pollutant dispersion in ambient and indoor air; and characterizing exposure and risk from modeled and monitored pollutant concentrations.  Prior to joining Gradient, Dr. Briggs was a doctoral student at the University of Washington, where she conducted research on the impacts of wildfires and long-range transport to surface pollutant concentrations.  Previously, Dr. Briggs worked as an environmental consultant, focusing on air permitting regulations and the exchange of environmental data through the Environmental Information Exchange Network.

* Nicole L. Briggs formerly Nicole L. Wigder

Education

Ph.D., Atmospheric Sciences, University of Washington

B.A., Geography, University of Washington

Expertise

  • Exposure Assessment
  • Air Dispersion Modeling
  • Air Quality Monitoring
  • Sources, Sinks, and Transport of Air Pollutants
  • Climate Science

Services

Representative Projects

Ozone Exposure Assessment: Provided written comments on human exposure assessments related to review of the US EPA National Ambient Air Quality Standards (NAAQS).

Ozone Exposure and Health Impact Modeling: Conducted sensitivity analyses of ozone exposures and associated lung function decrements using the Air Pollutants Exposure Model (APEX), and modeled health impacts from ozone using the Environmental Benefits Mapping and Analysis Program (BenMAP).

Surface Impoundment Closure Assessment: Developed and applied a framework for assessing air quality impacts from coal ash surface impoundment closure options, including modeling PM2.5 and PM10 concentrations resulting from fugitive dust and mobile source emissions using the AMS/ EPA Regulatory Model (AERMOD) and Motor Vehicle Emission Simulator (MOVES2014a).

Black Carbon and Elemental Carbon Assessment: Reviewed scientific literature on black carbon and elemental carbon source apportionment in Europe and the US.

Exposure Assessment: Modeled n-propyl-bromide (1-bromopropane) exposures and associated health risks using the Human Exposure Model (HEM-3).

Manganese Exposure Assessment: Modeled manganese concentrations using the AMS/ EPA Regulatory Model (AERMOD) as part of an assessment of human health risks from residual manganese in ambient air.

Meteorological Assessment: Evaluated patterns in wind direction and speed as part of an assessment of health impacts from a proposed composting facility abutting a neighborhood.

Coal Ash Risk Assessment: Developed a screening level risk assessment for a facility that is beneficially using coal fly ash as a soil stabilizer.

Propane Exposure Assessment: Evaluated the human health impacts from propane vented during routine operations at a storage facility, including impacts of ethyl mercaptan, which is used as an odorant.

Selected Publications

Briggs, NL; Long, CM.  2016. "Critical review of black carbon and elemental carbon source apportionment in Europe and the United States." Atmos. Environ. 144 : 409-427.

Briggs, NL; Jaffe, NL; Gao, H; Hee, JR; Baylon, PM; Zhang, Q; Zhou, S; Collier, SC; Sampson, PD; Cary, RA.  2016. "Particulate matter, ozone, and nitrogen species in aged wildfire plumes observed at the Mount Bachelor Observatory, a high elevation site in the Pacific Northwest." Aerosol Air Qual. Res.

Briggs, N.  2015. "Framework for Evaluating the Relative Impacts of Surface Impoundment Closure Options." Presented to the Pacific Northwest International Section of the Air & Waste Management Association, 19p.

Jaffe, DA; Wigder, NL; Downey, N; Pfister, G; Boynard, A; Reid, SB.  2013. "Impact of wildfires on ozone exceptional events in the Western U.S." Environ. Sci. Technol. 47 : 11065-11072.

Jaffe, DA; Wigder, NL.  2012. "Ozone production from wildfires: A critical review." Atmos. Environ. 51 : 1-10.