title: Ammonia assessment from agriculture: U.S. status and needs.
abstract: Recent studies suggest that human activities accelerate the production of reactive nitrogen on a global scale. Increased nitrogen emissions may lead to environmental impacts including photochemical air pollution, reduced visibility, changes in biodiversity, and stratospheric ozone depletion. In the last 50 yr, emissions of ammonia (NH3), which is the most abundant form of reduced reactive nitrogen in the atmosphere, have significantly increased as a result of intensive agricultural management and greater livestock production in many developed countries. These agricultural production practices are increasingly subject to governmental regulations intended to protect air resources. It is therefore important that an accurate and robust agricultural emission factors database exist to provide valid scientific support of these regulations. This paper highlights some of the recent work that was presented at the 2006 Workshop on Agricultural Air Quality in Washington, D.C. regarding NH3 emissions estimates and emission factors from agricultural sources in the U.S. and Europe. In addition, several best management practices are explored as the scientific community attempts to maximize the beneficial use of reactive nitrogen while simultaneously minimizing negative environmental impacts.
authors.affiliation: Dep. of Marine, Earth, and Atmospheric Sciences, North Carolina State Univ., Raleigh, NC, USA. viney_aneja@ncsu.edu
authors.forename: Viney P
authors.initials: VP
authors.lastname: Aneja
authors.forename: Jessica
authors.initials: J
authors.lastname: Blunden
authors.forename: Kristen
authors.initials: K
authors.lastname: James
authors.forename: William H
authors.initials: WH
authors.lastname: Schlesinger
authors.forename: Raymond
authors.initials: R
authors.lastname: Knighton
authors.forename: Wendell
authors.initials: W
authors.lastname: Gilliam
authors.forename: Greg
authors.initials: G
authors.lastname: Jennings
authors.forename: Dev
authors.initials: D
authors.lastname: Niyogi
authors.forename: Shawn
authors.initials: S
authors.lastname: Cole
mesh_terms: D000393:Air Pollutants / Q000032:analysis* / Q000737:chemistry; D000397:Air Pollution / Q000517:prevention & control; D000641:Ammonia / Q000032:analysis* / Q000737:chemistry; D000822:Animal Husbandry; D014481:United States
chemical_list: D000393:Air Pollutants; D000641:Ammonia