Air and Climate Change Research
John Walker
John Walker is a research scientist in the US EPA Office of Research and Development, National Risk Management Laboratory, Air Pollution Prevention and Control Division, (APPCD), Atmospheric Protection Branch (APB). He holds a M.S. in Atmospheric Science from North Carolina State University. John completed his Ph.D. in Soil Science at North Carolina State University. John's Ph.D. research investigates the atmospheric chemistry and deposition of ammonia and ammonium in agricultural regions.
Research Area
Dr. Walker’s current projects investigate ammonia air-surface
exchange in agricultural and forest landscapes, air-surface exchange of particles in forest
canopies, improved measurement techniques for ambient ammonia and inorganic aerosol,
and emissions of oxidized nitrogen from forest soils.
Contact Information
John Walker (walker.john@epa.gov)