A previous version of the IMPROVE variable table.  Note some of the variable abbreviations have changed and new variables have been added which are not reflected in this variable table.

Note:  The Attribute (the fourth column) is one of three possibilities:
CON - Concentration
UNC - Uncertainty
MDL - Minimum Detection Limit


Variable        Variable Name                         Data Type     Null Value      Units
Abbreviation                                                                      
                                                                                  
Year            Year                                  Text          ""              
Day             Day                                   Text          ""              
month           Month                                 Text          ""              
Attribute       Attribute                             Text          ""              
Al              Aluminim                              Number        .               ng/m3
As              Arsenic                               Number        .               ng/m3
BABS            Carbon Absorption                     Number        .               1e-8 1/m
BR              Bromium                               Number        .               ng/m3
CA              Calcium                               Number        .               ng/m3
CL              Chlorine                              Number        .               ng/m3
CL_             Chloride Ion (CL-)                    Number        .               ng/m3
CR              Chromium                              Number        .               ng/m3
CU              Copper                                Number        .               ng/m3
ECHT            Elemental Carbon (High Temperature)   Number        .               ng/m3
ECLT            Elemental Carbon (Low Temperature)    Number        .               ng/m3
FE              Iron                                  Number        .               ng/m3
H               Hydrogen                              Number        .               ng/m3
K               Potassium                             Number        .               ng/m3
MF              Fine Mass                             Number        .               ng/m3
MG              Magnesium                             Number        .               ng/m3
MN              Manganese                             Number        .               ng/m3
MO              Molybdenum                            Number        .               ng/m3
MT              PM10                                  Number        .               ng/m3
NA              Sodium                                Number        .               ng/m3
NI              Nickel                                Number        .               ng/m3
NO2_            Nitrite Ion                           Number        .               ng/m3
NO3_            Nitrate Ion                           Number        .               ng/m3
OCHT            Organic Carbon (High Temperature)     Number        .               ng/m3
OCLT            Organic Carbon (Low Temperature)      Number        .               ng/m3
P               Phosphorous                           Number        .               ng/m3
PB              Lead                                  Number        .               ng/m3
RB              Rubidium                              Number        .               ng/m3
S               Sulfur                                Number        .               ng/m3
SE              Selenium                              Number        .               ng/m3
SI              Silicon                               Number        .               ng/m3
SO2             Sulfure Dioxide                       Number        .               ng/m3
SO4             Sulfate Ion                           Number        .               ng/m3
SR              Strontium                             Number        .               ng/m3
TI              Titanium                              Number        .               ng/m3
V               Vanadium                              Number        .               ng/m3
ZN              Zinc                                  Number        .               ng/m3
ZR              Zirconium                             Number        .               ng/m3
OC1             Org. C. up_120_He                     Number        .               ng/m3
OC2             Org. C. up_250_He                     Number        .               ng/m3
OC3             Org. C. up_450_He                     Number        .               ng/m3
OC4             Org. C. up_550_He                     Number        .               ng/m3
OP              Pyrolized C._550_O2                   Number        .               ng/m3
EC1             Elem. C._550_O2                       Number        .               ng/m3
EC2             Elem. C. up_700                       Number        .               ng/m3
EC3             Elem. C. up_800                       Number        .               ng/m3