title: Baseline ambient gaseous ammonia concentrations in the Four Corners area and eastern Oklahoma, USA.
abstract: Ambient ammonia monitoring using Ogawa passive samplers was conducted in the Four Corners area and eastern Oklahoma, USA during 2007. The resulting data will be useful in the multipollutant management of ozone, nitrogen oxides, and visibility (atmospheric regional haze) in the Four Corners area, an area with growing oil/gas production and increasing coal-based power plant construction. The passive monitoring data also add new ambient ammonia concentration information for the U.S. and will be useful to scientists involved in present and future visibility modeling exercises. Three week integrated passive ammonia samples were taken at five sites in the Four Corners area and two sites in eastern Oklahoma from December, 2006 through December, 2007 (January, 2008 for two sites). Results show significantly higher regional background ammonia concentrations in eastern Oklahoma (1.8 parts per billion (ppb) arithmetic mean) compared to the Four Corners area (0.2 ppb arithmetic mean). Annual mean ammonia concentrations for all Four Corners area sites for the 2007 study ranged from 0.2 ppb to 1.5 ppb. Peak ambient ammonia concentrations occurred in the spring and summer in both areas. The passive samplers deployed at the Stilwell, Oklahoma site compared favorably with other passive samplers and a continuous ammonia monitoring instrument.
authors.affiliation: Air Quality Analysis Section, US Environmental Protection Agency Region 6, 1445 Ross Avenue, Dallas, TX 75202, USA.
authors.forename: Mark E
authors.initials: ME
authors.lastname: Sather
authors.forename: Johnson
authors.initials: J
authors.lastname: Mathew
authors.forename: Nghia
authors.initials: N
authors.lastname: Nguyen
authors.forename: John
authors.initials: J
authors.lastname: Lay
authors.forename: George
authors.initials: G
authors.lastname: Golod
authors.forename: Robert
authors.initials: R
authors.lastname: Vet
authors.forename: Joseph
authors.initials: J
authors.lastname: Cotie
authors.forename: Terry
authors.initials: T
authors.lastname: Hertel
authors.forename: Erik
authors.initials: E
authors.lastname: Aaboe
authors.forename: Ryan
authors.initials: R
authors.lastname: Callison
authors.forename: Jacque
authors.initials: J
authors.lastname: Adam
authors.forename: Danielle
authors.initials: D
authors.lastname: Keese
authors.forename: Jeremy
authors.initials: J
authors.lastname: Freise
authors.forename: April
authors.initials: A
authors.lastname: Hathcoat
authors.forename: Brenda
authors.initials: B
authors.lastname: Sakizzie
authors.forename: Michael
authors.initials: M
authors.lastname: King
authors.forename: Chris
authors.initials: C
authors.lastname: Lee
authors.forename: Sylvia
authors.initials: S
authors.lastname: Oliva
authors.forename: George
authors.initials: G
authors.lastname: San Miguel
authors.forename: Leon
authors.initials: L
authors.lastname: Crow
authors.forename: Frank
authors.initials: F
authors.lastname: Geasland
mesh_terms: D000641:Ammonia / Q000032:analysis*; D005740:Gases / Q000032:analysis*; D009825:Oklahoma; D015206:Southwestern United States
chemical_list: D005740:Gases; D000641:Ammonia