Code |
Description |
°C |
degrees Celsius |
µg |
microgram (10-6 g) |
µm |
micron or micrometer (10-6 m) |
ABL |
Atmospheric Boundary Layer |
AGL |
Above Ground Level |
CFR |
Code of Federal Regulations |
CO |
carbon monoxide |
CO2 |
carbon dioxide |
DRI |
Desert Research Institute |
EDAS |
Eta Data Assimilation System |
EPA |
Environmental Protection Agency |
ESRI |
Environmental Systems Research Institute |
GIS |
Geographic Information System |
GOES |
Geostationary Operational Environmental Satellite |
GPS |
Global Positioning System |
HYSPLIT |
HYbrid Single-Particle Lagrangian Integrated Trajectory model |
IMPROVE |
Interagency Monitoring of PROtected Visual Environments |
km |
kilometer (103 m) |
m |
meter |
m3 |
cubic meter |
mb |
millibar |
mm |
millimeter |
Mm-1 |
inverse megameter (1/1,000,000 meter); a measure of light extinction |
m/s |
meter per second |
MODIS |
MODerate Imaging Spectroradiometer |
MSL |
Mean Sea Level |
NAAQS |
National Ambient Air Quality Standards |
NASA |
National Aeronautics and Space Administration |
NEI |
National Emission Inventory |
NH3 |
ammonia |
NH4+ |
ammonium ion |
NH4HSO4 |
ammonium bisulfate |
NH4NO3 |
ammonium nitrate |
(NH4)2SO4 |
ammonium sulfate |
nm |
nanometer (10-9 m) |
NO2 |
nitrogen dioxide |
NO3– |
nitrate ion |
NOX |
nitrogen oxides |
NPS |
National Park Service |
NSR |
New Source Review |
NWS |
National Weather Service |
O3 |
Ozone |
PM |
suspended Particulate Matter with no regard to size of particles |
PM10 |
suspended Particulate Matter with aerodynamic diameters less than 10
microns (µm) |
PM2.5 |
suspended Particulate Matter with aerodynamic diameters less than 2.5
microns (µm) |
ppb or ppbv |
parts per billion volume |
pH |
potential of Hydrogen |
ppm or ppmv |
parts per million volume |
PSD |
Prevention of Significant Deterioration |
RH |
Relative Humidity |
SIP |
State Implementation Plan |
SLAMS |
State/Local Air Monitoring Stations |
SO2 |
sulfur dioxide |
SO4= |
sulfate ion |
TEOM® |
Tapered Element Oscillating Microbalance |
TPY |
Tons Per Year |
TSP |
Total Suspended Particulate matter |
U.S. EPA |
United States Environmental Protection Agency |
USDA |
United States Department of Agriculture |
USGS |
United States Geological Service |
UTC |
Coordinated Universal Time or sometimes called Zulu time or Greenwich
Mean Time |
UTM |
Universal Transverse Mercator |
VOC |
Volatile Organic Compounds |