| acidity | acidity (H⁺ as pH) |
| ACM | Aerochem Collector - MDN and NTN |
| ADS | Atmospheric Deposition Sampler |
| AG | Agriculture Drive (lab) |
| AIRMoN | Atmospheric Integrated Research Monitoring Network |
| AMNet | Atmospheric Mercury Network |
| AMoN | Ammonia Monitoring Network |
| AMSC | Aeroallergen Monitoring Science Committee |
| ANSI | American National Standards Institute |
| APIOS | Acid Precipitation in Ontario Study |
| AWAW | Air Quality Awareness Week |
| AQC&T | Air Quality Conditions and Trends |
| ASQC | American Society for Quality Control |
| ASTM | American Society for Testing and Materials |
| BAC | Budget Advisory Committee |
| BLM | Bureau of Land Management (U.S.) |
| Ca²⁺ | Calcium |
| CAA | Clean Air Act |
| CAAA | Clean Air Act Amendments |
| CAL | Central Analytical Laboratory – lab name prior to NAL |
| CAPD | Clean Air and Power Division |
| CAMR | Clean Air Mercury Rule |
| CANSAP | Canadian Network for Sampling Acid Precipitation |
| CAPMoN | Canadian Air and Precipitation Monitoring Network |
| CARB | California Air Resources Board |
| CASTNET | Clean Air Status and Trends Network |
| CFR | Code of Federal regulations |
| Cl⁻ | Chloride |
| CLAD | Critical Loads of Atmospheric Deposition |
| cm | Centimeter |
| CMAQ | Community Multiscale Air Quality Model |
| COA | Certificate of analysis |
| COC | Chain of custody |
| CSI | Campbell Scientific, Inc. |
| CSREES | Cooperative State Research, Education, and Extension Service |
| CVAFS | Cold Vapor Atomic Fluorescence Spectroscopy |
| D | NAL designation for Dry Sample |
| DEM | Digital Elevation Model |
| DF/DK | NAL designation for System Blank And Field Audit samples (Designated - Field, Designation - Known Values) |
| DMAG | Data Management Advisory Group |
| DOC | Demonstration of Capability |
| DQI | Data Quality Indicator |
| DQO | Data quality objective |
| EC | Executive Committee |
| ECCC | Environment and Climate Change Canada |
| EEMS | Environmental, Engineering and Measurement Services, Inc. |
| EFGS | Eurofins Frontier Global Sciences |
| EHD | Environmental Health Division within the Wisconsin State Lab of Hygiene |
| ELN | Electronic laboratory notebook |
| EMEFS | Eulerian Model Evaluation Field Study |
| EOS | Education and Outreach Subcommittee |
| EPA | Environmental Protection Agency (U.S.) |
| ESRI | Environmental Systems Research Institute ArcGrid™ coverage file format |
| ETI NOAHIV | ETI Instruments Total Precipitation Gauge |
| FAQ | Frequently Asked Questions |
| FB | Calibration blank (NTN and AMoN) (F for LIMS function) |
| FCB | Initial Calibration blank (MDN) (F for LIMS function) |
| FCCB | Continuing calibration blank (MDN) (F for LIMS function) |
| FCRM | Certified Reference Material (F for LIMS function) |
| FIA | Flow Injection Analysis |
| FL | Low level calibration verification standard (NTN and AMoN) (F for LIMS function) |
| FLP | Low level calibration verification for high curve on ICP (NTN) (F for LIMS function) |
| FM | Mid-level calibration verification standard (NTN and AMoN) (F for LIMS function) |
| FMDL | MDL level QC sample Method Detection Limit |
| FOF | Field Observer Form |
| FOPR | Ongoing Precision and Recovery (MDN) (F for LIMS function) |
| FORF | Field Observer Report Form |
| FQCS | Quality control standard (MDN) (F for LIMS function) |
| FR50 | Faux rain at ~ 50% of historical NTN analytes |
| FS | Forest Service (U.S.) |
| FSSD | Field Site Survey Database |
| FWS | Fish and Wildlife Service (U.S.) |
| GEM | Gaseous Elemental Mercury |
| GOM | Gaseous Oxidized Mercury |
| GPRA | Government Performance and Results Act |
| GPS | Global Positioning System |
| GRS | General Records Retention Schedule |
| HAL | Mercury (Hg) Analytical Lab – former laboratory prior to NAL |
| HDPE | High Density Polyethylene |
| Hg | Mercury |
| HM | Henry Mall (lab) |
| HNO₃ | Nitric acid |
| HONO | Nitrous acid |
| HP PDA | HP PDA’s were introduced with the implementation of the electronic gauges. The PDA’s are outdated and hardware support is limited. |
| HR | Human resources |
| IC | Ion chromatography |
| ICP-OES | Inductively Coupled Plasma - Optical Emission Spectroscopy |
| IDOC | Initial Demonstration of Capability |
| IDW | Inverse Distance Weighting |
| IMPROVE | Interagency Monitoring of Protected Visual Environment |
| ISWS | Illinois State Water Survey |
| K⁺ | Potassium |
| kg/ha/yr | kilograms per hectare per year |
| L | Liter |
| Lat | Latitude |
| LB | Laboratory Blank |
| LIMS | Laboratory Information Management System |
| LDR | Linear dynamic range |
| Litterfall | Total plant mass transfered to the forest floor |
| LoggerLink | Campbell Scientific app that works on Android and iOS devices for data download |
| Long | Longitude |
| LRTAP | Long-Range Transboundary Air Pollution |
| MAP3S | Multi-state Atmospheric Power Production Pollution Study |
| MDL | Method Detection Limit |
| MDN | Mercury Deposition Network |
| MDS | Material Distribution Service |
| MeHg | Methylmercury |
| MELD | Mercury in the Environment and Links to Deposition |
| MerPas | Mercury Passive Sampler |
| mg | milligram |
| Mg²⁺ | Magnesium |
| mL | milliliter |
| MLN | Mercury Litterfall Network |
| MMF | Measurement-Model Fusion |
| MOF | MDN Observer Form |
| MQ | Milli Q - (Type I water) |
| MS | Matrix spike |
| MSD | Matrix spike duplicate |
| N-CON | N-CON Systems Company, Inc. - Manufacturers of NTN, and MDN Single and Dual Samplers |
| N2 | Molecular nitrogen |
| N2O | Nitrous oxide |
| Na⁺ | Sodium |
| NADP | National Atmospheric Deposition Program |
| NADPRain | Program used for e-gauge data download on the HP PDA |
| NAL | NADP Analytical Laboratory |
| ng/L | Nanogram/liter |
| NAPAP | National Acid Precipitation Assessment Program |
| NED | Network Equipment Depot |
| NEI | National Emissions Inventory |
| NELAP | National Environmental Laboratory Accreditation Program |
| ng | Nanogram |
| NH₃ | Ammonia |
| NH₄⁺ | Ammonium |
| NHₓ | Reduced nitrogen (NH₃ + NH₄⁺) |
| NIFA | National Institute of Food and Agriculture (USDA) |
| NIST | National Institute of Standards and Technology |
| Nn-r | Non-reactive nitrogen |
| NO | Nitric oxide |
| NO₂ | Nitrogen dioxide |
| NO₃⁻ | Nitrate |
| NOAA | National Oceanic and Atmospheric Administration (U.S.) |
| NOS | Network Operations Subcommittee |
| NOx | Nitrogen oxides |
| NPS | National Park Service (U.S.) |
| Nr | Reactive nitrogen |
| NTN | National Trends Network |
| NWS | National Weather Service (U.S.) |
| O₃ | Ozone |
| OAP | Office of Atmospheric Protection in the U.S. Environmental Protection Agency |
| OIS | Office of Information Systems in the Wisconsin State Lab of Hygiene |
| OM | Occurrence management |
| OTC | Ozone Transport Commission |
| Ott Pluvio | OTT Hydromet precipitation gauge |
| PART | Program Assessment Rating Tool |
| PBM | Particulate Bound Mercury |
| PBT | Persistent, bioaccumulative, toxic substances |
| PDA | Personal Digital Assistant |
| PET | Polyethylene terephthalate |
| PETG | Polyethylene terephthalate copolyester glycol |
| PFAS | Per- and polyfluoroalkyl substances |
| pH | measure of acidity and alkalinity of a solution |
| PI | Primary Investigator |
| PM | Particulate matter |
| PM₁₀ | Particulate matter 10 micrometers or less in diameter |
| PM₂.₅ | Particulate matter 2.5 micrometers or less in diameter |
| PO | NADP Program Office |
| ppm | part per million |
| ppt | part per trillion |
| PRISM | Parameter-elevation Regression on Independent Slopes Model |
| PT | Proficiency test |
| QA | Quality Assurance |
| QAAG | Quality Assurance Advisory Group |
| QAC | Quality Assurance Committee (WSLH) |
| QAP | Quality Assurance Plan |
| QAPP | Quality Assurance Project Plan |
| QAR | Quality Assurance Report |
| QC | Quality Control |
| QC FLRB | Quality control FLRB lab reagent blank (MDN) (F for LIMS function) |
| QMP | Quality Management Plan |
| QMS | Quality Management System |
| QR | Quality Rating |
| QR | QR Quality rating FLRB laboratory regent blank (MDN) (F for LIMS function) |
| RDA | Records disposition authorization |
| RM | Reactive Mercury (GOM + PBM) |
| RO | Reverse Osmosis (Type II water) |
| SAES | State Agricultural Experiment Stations |
| SC115 | Flash Memory Drive that was used as a replacement for the PDA, it connects to the datalogger via a serial cable |
| SIP | State Implementation Plan |
| SITE ID | Two letter State Abbreviation and 2-digit Number (e.g. OH71) |
| SIW | Site Information Worksheet |
| SO2 | Sulfur dioxide |
| SO₄²⁻ | Sulfate |
| SOP | Standard Operating Procedure |
| SOW | Statement of Work |
| T | NAL designation for Trace sample |
| TDep | Total Deposition Science Committee |
| TOC | Table of Contents |
| US | United States |
| USDA | United States Department of Agriculture |
| USGS | United States Geological Survey |
| UW | University of Wisconsin Madision |
| VPN | Virtual private network |
| W | NAL designation for Wet sample |
| WAAS | Wide Area Augmentation System |
| WD | NAL designation for Wet Dilute Sample |
| WDHS | Wisconsin Department of Health Services |
| WDNR | Wisconsin Department of Natural Resources |
| WG | Working group |
| WI | NAL designation for Wet Incomplete Sample |
| WMO | World Meteorological Organization |
| WSLH | Wisconsin State Laboratory of Hygiene |
| µS/cm | microsiemens/ centimeter |
