Jump to main content
US EPA
United States Environmental Protection Agency
Search
Search
Main menu
Environmental Topics
Laws & Regulations
About EPA
Health & Environmental Research Online (HERO)
Contact Us
Print
Feedback
Export to File
Search:
This record has one attached file:
Add More Files
Attach File(s):
Display Name for File*:
Save
Citation
Tags
HERO ID
4738146
Reference Type
Journal Article
Title
On-road emissions of ammonia: An underappreciated source of atmospheric nitrogen deposition
Author(s)
Fenn, ME; Bytnerowicz, A; Schilling, SL; Vallano, DM; Zavaleta, ES; Weiss, SB; Morozumi, C; Geiser, LH; Hanks, K
Year
2018
Is Peer Reviewed?
1
Journal
Science of the Total Environment
ISSN:
0048-9697
EISSN:
1879-1026
Publisher
ELSEVIER SCIENCE BV
Location
AMSTERDAM
Volume
625
Page Numbers
909-919
Language
English
PMID
29996462
DOI
10.1016/j.scitotenv.2017.12.313
Web of Science Id
WOS:000426356600093
URL
https://linkinghub.elsevier.com/retrieve/pii/S0048969717337464
Exit
Abstract
We provide updated spatial distribution and inventory data for on-road NH3 emissions for the continental United States (U.S.) On-road NH3 emissions were determined from on-road CO2 emissions data and empirical NH3:CO2 vehicle emissions ratios. Emissions of NH3 from on-road sources in urbanized regions are typically 0.1-1.3tkm-2yr-1 while NH3 emissions in agricultural regions generally range from 0.4-5.5tkm-2yr-1, with a few hotspots as high as 5.5-11.2tkm-2yr-1. Counties with higher vehicle NH3 emissions than from agriculture include 40% of the U.S.
POPULATION:
The amount of wet inorganic N deposition as NH4+ from the National Atmospheric Deposition Program (NADP) network ranged from 37 to 83% with a mean of 58.7%. Only 4% of the NADP sites across the U.S. had <45% of the N deposition as NH4+ based on data from 2014 to 2016, illustrating the near-universal elevated proportions of NH4+ in deposition across the U.S. Case studies of on-road NH3 emissions in relation to N deposition include four urban sites in Oregon and Washington where the average NH4-N:NO3-N ratio in bulk deposition was 2.3. At urban sites in the greater Los Angeles Basin, bulk deposition of NH4-N and NO3-N were equivalent, while NH4-N:NO3-N in throughfall under shrubs ranged from 0.6 to 1.7. The NH4-N:NO3-N ratio at 7-10 sites in the Lake Tahoe Basin averaged 1.4 and 1.6 in bulk deposition and throughfall, and deposition of NH4-N was strongly correlated with summertime NH3 concentrations. On-road emissions of NH3 should not be ignored as an important source of atmospheric NH3, as a major contributor to particulate air pollution, and as a driver of N deposition in urban and urban-affected regions.
Tags
•
ISA NOxSOxPM Ecology (2018)
•
ISA NOxSOxPM Ecology (2020- Final Project Page)
Cited
Appendix 4
•
LitSearch-NOx (2024)
Keyword Search
Exposure
Confounding
WoS
PubMed
PIA
WoS
PubMed
TIAB Screening
Atmospheric
Round 1
Exclude
Home
Learn about HERO
Using HERO
Search HERO
Projects in HERO
Risk Assessment
Transparency & Integrity