Reply to Liu et al.: On the importance of US deposition of nitrogen dioxide, coarse particle nitrate, and organic nitrogen.
Department of Atmospheric Science, Colorado State University, Fort Collins, CO 80523;
Yi
Y
Li
National Park Service, Cooperative Institute for Research in the Atmosphere, Colorado State University, Fort Collins, CO 80523;
Bret A
BA
Schichtel
Office of Research and Development, National Risk Management Research Laboratory, US Environmental Protection Agency, Research Triangle Park, NC 27711;
John T
JT
Walker
Office of Research and Development, National Exposure Research Laboratory, US Environmental Protection Agency, Research Triangle Park, NC 27711;
Donna B
DB
Schwede
Office of Research and Development, National Risk Management Research Laboratory, US Environmental Protection Agency, Research Triangle Park, NC 27711;
Xi
X
Chen
National Atmospheric Deposition Program, University of Illinois Urbana-Champaign, Champaign, IL 61820;
Christopher M B
CM
Lehmann
Clean Air Markets Division, US Environmental Protection Agency, Washington, DC 20460.
Melissa A
MA
Puchalski
National Atmospheric Deposition Program, University of Illinois Urbana-Champaign, Champaign, IL 61820;
David A
DA
Gay
Department of Atmospheric Science, Colorado State University, Fort Collins, CO 80523; collett@atmos.colostate.edu.
Jeffrey L
JL
Collett
D009566:Nitrates; D009584:Nitrogen; D009585:Nitrogen Dioxide; D009589:Nitrogen Oxides
D009566:Nitrates; D009589:Nitrogen Oxides; D009584:Nitrogen; D009585:Nitrogen Dioxide