• Address:
  705 Spear Street
  South Burlington, Vermont 05403
  United States of America
  
  Phone: (802) 391-4135
  Email: femc@uvm.edu
  Website: www.uvm.edu/femc

Acidification of waterbodies is linked to deposition of sulfur and nitrogen oxides. This project will assess the relationship between a proposed index of aquatic acidification due to airborne pollutants and the concentrations in air of ammonia, ammonium, nitrogen oxides and sulfur oxides. Data comes from participation in both the Ammonia Monitoring Network (AMoN) and EPA's CASTNet. AMoN is a NADP network measuring NH3 concentrations across the United States with the goal of providing long term trends in ambient NH3 concentrations and depositions. The VMC air quality site began participating in this network in November 2012 as a component of the AAI. CASTNET is a national air quality monitoring network designed to provide data to assess trends in air quality, atmospheric deposition, and ecological effects due to changes in air pollutant emissions.CASTNET measurements are used to assess long-term, regional trends in sulfur and nitrogen pollutants.

• Label: AIRVOL

• Description: Total volume of air sampled, m3; value is calculated from exposure time and derived flow rate following the SOP; missing values are indicated by -9.0

• Storage Type: decimal

• Measurment Type: ratio

• Label: CHNGDATE

• Description: Most recent date and time any data values were edited within the NADPID set

• Storage Type: datetime

• Measurment Type: datetime
• String Format: M-DD-YYYY hh:mm:ss

• Label: CONC

• Description: Arithmetic average gaseous ammonia concentration, μg/m³; value is indicated as -9.00 if there were no valid individual replicate values during the sampling period

• Storage Type: decimal

• Measurment Type: ratio

• Label: ENDDATE

• Description: End date and time of sample exposure, GMT

• Storage Type: datetime

• Measurment Type: datetime
• String Format: M-DD-YYYY hh:mm:ss

• Label: NADPID

• Description: Unique NADP identifier of individual sample sets consisting of one or more sample replicates and a travel blank deployed together

• Storage Type: text

• Measurment Type: nominal

• Label: QR

• Description: Quality Rating Code: A fully qualified with no problems, B valid data with minor problems, C invalid data

• Storage Type: text

• Measurment Type: nominal

• Label: SITEID

• Description: Two-letter location designator followed by a two digit number

• Storage Type: text

• Measurment Type: nominal

• Label: STARTDATE

• Description: Start date and time of sample exposure, GMT

• Storage Type: datetime

• Measurment Type: datetime
• String Format: M-DD-YYYY hh:mm:ss

• Ammonia and ammonium collection
  • Started: 2012-11-20
    
  • Method Description: Passive diffusion-type samplers are deployed for two week periods year-round. Each sampler accumulates ammonia and ammonium for the period then is collected and shipped to a central laboratory for analysis using sonification and flow injection analysis.

• Atmospheric pollutants and meteorological dat
  • Method Description: Each CASTNET site measures atmospheric sulfur and nitrogen pollutants and cations. Concentrations of ambient sulfur and nitrogen species are collected and measured weekly (Tuesday to Tuesday, 168 hours) via a three-stage filter pack, and the data are averaged over the 1-week period.

• Ammonia sampler
• Started: 2012-11-20
  
• Sampling Description: One or more Radiello-brand diffusion-type passive samplers are attached to a plastic shelter mounted on a pole two meters above any surfaces.