HCl (hydrochloric acid)
n-C4H10 (n-butane)
Watervapor profile
Vanadium (V), total aerosol
C6Hn (n={14, 12}; sum of 3-methylpentane & cyclohexane)
Air temperature (at specified distance from reference surface)
Sunshine duration
Lead (Pb), total aerosol
C3H8 (propane)
CH3CHO (acetaldehyde, ethanal)
C2O4= (oxalate, ethanedioate), total aerosol
Hygroscopic growth factor, 110 μm equivalent
Calcium (Ca++), total aerosol
Barium (Ba), total aerosol
Copper (Cu)
Cloud hydrometeor concentration
UV Erythemally weighted
Propionate (C2H5COO-)
Multiwavelength optical depth, total aerosol
Number size distribution, total aerosol
Magnesium (Mg++)
Total lightning density
CCl2F2 (dichlorodifluoromethane, CFC-12)
C4H5F5 (1,1,1,3,3-pentafluorobutane, HFC-365mfc)
Mercury (Hg), total aerosol
CHCl3 (chloroform)
C5H10 (sum of 1-pentene & 2-methyl-2-butene)
Humidity (at specified distance from reference surface)
Barium (Ba), PM2.5
C6H14 (2-methylpentane)
Ammonium (NH4+), total aerosol
Copper (Cu), total aerosol
C3H4O (prop-2-enal, acrolein)
Chloride (Cl-), PM10
CO2 [C-13]
Other chemical components (fine)
C14H10 (anthracene), in air
C6H6Cl6 (1,2,3,4,5,6-hexachlorocyclohexane, gamma-lindane, gamma-HCH), in air
C3HF7 (1,1,1,2,3,3,3-Heptafluoropropane, HFC-227ea)
Global solar radiation (downwelling)
Light backscattering coefficient, PM10
Iodide (I-)
Thorium (Th), total aerosol
Hydrogen ion (H+) or pH
Pressure tendency
Vertical ozone profile
C3H4 (propyne)
C8H10 (o-xylene)
C5H10 (1-pentene)
Aluminium (Al), total aerosol
CF4 (tetrafluoromethane, carbon tetrafluoride, perfluoromethane, PFC-14)
Sodium (Na+), PM2.5
NOx
Light backscattering coefficient, PM1
Mass concentration (fine) or Mass PM1
CBrF3 (bromotrifluoromethane, Halon 1301)
Optical depth within each layer
C2H2F4 (1,1,1,2-tetrafluoroethane, HFC-134a)
Aerosol volcanic ash (Total column)
Hydrometeor radius
CH2Br2 (dibromomethane)
i-C4H8 (2-methylpropene, iso-butene)
Strontium (Sr), PM2.5
ROOH
C5Hn (n={10, 8}; sum of 3-methyl-1-butene & cyclopentene)
Occurrence of precipitation during last period (yes/no)
Cadmium (Cd), total aerosol
C2H2 (ethyne, acetylene)
Zinc (Zn)
C7H16 (sum of methylhexanes)
Sum of nitric acid (HNO3) and nitrate (NO3-), in air and aerosol
Elemental carbon (coarse), PM10
C12H8Cl6 (aldrin), in total precipitation
Cadmium (Cd)
C18H12 (Benz(a)anthracene), PM10
ClONO2 (chlorine nitrate)
Long-wave radiation (upwelling)
Aerosol Absorption Optical Depth
C2H3ClF2 (1-chloro-1,1-difluoroethane, HCFC-142b)
n-C7H16 (n-heptane)
Lightning discharge polarity
Zinc (Zn), total aerosol
Integrated air samples
C6Hn (n={14, 12}; sum of 2,3-dimethylbutane & methylcyclopentane
Extreme temperature (min, max) (at specified distance from reference surface)
C4H6O (2-methylprop-2-enal, methacrolein)
CH3OH (methanol)
CH3O3S- (methanesulphonate), total aerosol
Hygroscopic growth factor, 35 μm equivalent
C5H12 & C4H8 (sum of 2,2-dimethylpropane & c-2-butene)
Magnesium (Mg++), PM2.5
Bismuth (Bi), total aerosol
Lead (Pb)
UV Spectral
Nitrate (NO3-), PM10
Cloud ice
Cloud liquid water (CLW)
Sodium (Na+)
CCl4 (carbon tetrachloride)
C14H10 (phenanthrene), in air
CHF3 (trifluoromethane, HFC-23)
State of ground
Nickel (Ni), total aerosol
COF2 (difluoromethanal, carbonyl fluoride)
HDO (as a chemical species)
Mass mixing ratio
COS (OCS, carbon oxide sulfide, carbonyl sulfide)
C6H14 (n-hexane)
Krypton [Kr-85]
Ammonium nitrate (NH4NO3), PM1
Lanthanum (La), PM2.5
C3H6 (propene)
Chloride (Cl-), total aerosol
C2H3O2- (CH3COO-, acetate), in aerosol
Strong acids
Light scattering coefficient, PM1
Sulphate (SO4=), corrected
Tin (Sn), total aerosol
Present weather
C9H12 (1,2,4-trimethylbenzene)
Lithium (Li), total aerosol
CH3Cl (methylchloride)
C5H10 (2-methyl-2-butene)
Antimony (Sb), total aerosol
Ammonia (NH3), PM2.5
Chromium (Cr), total aerosol
CH4
Mass concentration (size fractionated)
C14H10 (anthracene), PM10
C6H6Cl6 (1,2,3,4,5,6-hexachlorocyclohexane, alpha-lindane, alpha-HCH), in aerosol
C2HF5 (pentafluoroethane, HFC-125)
Lithometeor type
CH3Br (methylbromide)
Nitrite (NO2-)
Thallium (Tl), PM2.5
C6H12 (cyclohexane)
Type of precipitation
Cerium (Ce), total aerosol
C2H4 (ethene)
C7H8 (toluene)
Major inorganic components (TSP)
C4H8 (sum of butenes)
Elemental carbon, PM2.5
Carbonaceous-organic material (fine)
C18H12 (Benz(a)anthracene), in air
HNO3 (nitric acid)
Nitrate (NO3-)
Light absorption coefficient, PM1
Aerosol effective radius
CHClF2 (chlorodifluoromethane, HCFC-22)
Freezing level height in clouds
t-C5H10 (trans-2-pentene)
Type of high clouds
BrO (bromine monoxide)
C4H8 (1-butene)
c-C4H8 (cis-2-butene)
Hygroscopic growth factor, 75 μm equivalent
C5H14 (2,3-dimethylbutane)
Amount of precipitation
Potassium (K+), PM10
Cadmium (Cd), PM10
Lightning detection (time and location)
Mercury (Hg)
Melting layer depth in clouds
Nitrate (NO3-), total aerosol
Cloud ice effective radius
Sulphate (SO4=), total
C12H8Cl6 (aldrin), in aerosol
Horizontal wind direction at specified distance from reference surface
C14H10 (phenanthrene), in wet deposition
Height of cloud top
Phosphorous (P), total aerosol
H2O2 (hydrogen peroxide)
i-C7H16 (2-methylhexane, isoheptane)
Water vapour pressure
Vanadium (V), PM2.5
C6H6 (benzene)
Radon [Rn-222]
Lead (Pb), PM10
C3H6O (propanal)
CH3CH2OH (ethanol)
C2O4= (oxalate, ethanedioate), PM10
CCN concentration spectra
Calcium (Ca++), PM2.5
Cobalt (Co)
Cloud drop effective radius
UV Broadband
Formate (HCOO-)
Light scattering coefficient, total aerosol
Number size distribution, PM10
Calcium (Ca++)
Atmospheric pressure profile
C2ClF5 (1-chloro-1,1,2,2,2-pentafluoroethane, CFC-115)
CH2O (formaldehyde)
Manganese (Mn), total aerosol
CHBr3 (bromoform)
C5H10 (cyclopentane)
SO2F2 (sulphuryl fluoride)
Turbulence type (low levels and wake vortex)
Arsenic (As), total aerosol
C6H14 (2,2-dimethylbutane)
Ammonium (NH4+), PM2.5
Copper (Cu), PM10
Chloride (Cl-), PM1
CO2
Number concentration
Other chemical components (coarse)
C14H10 (anthracene), in air and aerosol
C6H6Cl6 (1,2,3,4,5,6-hexachlorocyclohexane, alpha-lindane, alpha-HCH), in wet precipitation
C3H3F5 (1,1,1,3,3-Pentafluoropropane, HFC-245fa)
Gust Speed
C18H12 (Benz(a)anthracene), in total precipitation
Obscuration type
Direct solar radiation
Turbulence
Fluoride (F-)
Thorium (Th), PM2.5
Electric conductivity
Characteristic of pressure tendency
Total column ozone
C2H6S (dimethylsulfide, DMS)
C8H10 (m-xylene)
Major inorganic components (fine)
C4H8O (butanal isomers)
Aluminium (Al), PM2.5
C3F8 (octafluoropropane, PFC-218)
Observed variable - measurand (atmosphere)
Sodium (Na+), PM10
NO2
Light absorption coefficient, total aerosol
Mass concentration (coarse) or Mass PM10
Chloride (Cl-)
CBrClF2 (Halon 1211)
Optical depth of fog
Type of middle clouds
Aerosol volcanic ash (mass concentration)
Extinction coefficient
C2HCl3 (trichloroethene)
i-C4H10 (2-methylpropane, iso-butane)
C2F6 (hexafluoroethane, PFC-116)
Selenium (Se), total aerosol
C5H8 (cyclopentene)
Intensity of precipitation
Cadmium (Cd), PM2.5 thru PM10
Lightning distance from station
Vanadium (V)
PSC occurrence
Sum of ammonia (NH3) and ammonium (NH4+), in air and aerosol
Sulphate (SO4=), total, PM2.5
C12H8Cl6 (aldrin), in air and aerosol
Arsenic (As)
C16H10 (pyrene), in air and aerosol
C2H3O5N (peroxyacetylnitrate, PAN)
Long-wave radiation (downwelling)
C2H3Cl2F (1,1-dichloro-1-fluoroethane, HCFC-141b)
Rubidium (Rb), total aerosol
HF (hydrofluoric acid)
n-C5H12 (n-pentane)
Lightning discharge energy
Zinc (Zn), PM2.5
C6Hn (n={14, 12}; sum of 2,2-dimethylbutane & methylcyclopentane
Dew-point temperature (at specified distance from reference surface)
Surface albedo
Lithium (Li), PM2.5
C4H6 (1,3-butadiene, butadiene)
CH3CN (acetonitrile)
CH3O3S- (methanesulphonate), PM1
Hygroscopic growth factor, 165 μm equivalent
C5H10O (pentanal, valeraldehyde)
Magnesium (Mg++), PM10
Bismuth (Bi), PM2.5
Iron (Fe)
Effective radius of cloud hydrometeors
UV Multiband
Acidity-Alkalinity, total aerosol
Vertical distribution of properties
Potassium (K+)
Lightning density cloud-to-ground
CCl3F (trichlorofluoromethane, CFC-11)
C14H10 (phenanthrene), in aerosol
CH2F2 (difluoromethane, HFC-32)
Special phenomena
Nickel (Ni), PM10
C5H10 (sum of pentenes)
H2O (as a chemical species)
Integrated water vapour
C6H14 (3-methylpentane)
CO2 [C-14]
Ammonium nitrate (NH4NO3), total aerosol
Iron (Fe), total aerosol
C3H4O2 (2-oxopropanal, methylglyoxal)
Chloride (Cl-), PM2.5
CO2 [O-18]
C2H3O2- (CH3COO-, acetate), PM1
C14H10 (phenanthrene), PM10
C6H6Cl6 (1,2,3,4,5,6-hexachlorocyclohexane, gamma-lindane, gamma-HCH), in wet precipitation
Wind (Z component, vertical)
Global solar radiation (upwelling)
Light backscattering coefficient, total aerosol
Phosphate (PO4---)
Tin (Sn), PM2.5
Aerological soundings
Beryllium [Be-7]
Past weather
C8H10 (p,m-xylene)
C5H10 (2-methyl-1-butene)
N2O
Antimony (Sb), PM2.5
Sodium (Na+), total aerosol
NOy
Mass concentration (medium), PM2.5
C13H10 (9H-fluorene, fluorene), in air
Short-wave cloud reflectance
C6Cl6 (hexachlorobenzene, HCB), in air
C2H4F2 (1,1-difluoroethane, HFC-152a)
Sulphur (S)
Hydrometeor type
CH2Cl2 (dichloromethane)
i-C5H12 (2-methylbutane, iso-pentane)
Strontium (Sr), total aerosol
C5Hn (n={12, 10}; sum of n-pentane & cyclopentane)
Rate of ice accretion
Lightning discharge type (cloud to cloud, cloud to surface)
Cerium (Ce), PM2.5
C2H2O2 (oxaldehyde, ethanedial)
C7H6O (benzene carbaldehyde)
Major chemical components (size fractionated)
Elemental carbon, PM1
C12H8Cl6 (aldrin), in wet precipitation
Carbonaceous-organic material (coarse), PM10
C18H12 (Benz(a)anthracene), in aerosol
HCN (formonitrile, hydrogen cyanide)
Ammonium (NH4+)
Aerosol Extinction Coefficient
Aerosol column burden (mass density)
C2H3F3 (1,1,1-trifluoroethane, HCFC-143a)
t-C4H8 (trans-2-butene)
Lightning discharge rates
Type of cloud
Temperature profile
UV-B radiation
C4H6O (but-3-en-2-one, methylvinylketone)
NMHC
CHO2- (HCOO-, formate), in aerosol
Hygroscopic growth factor, 50 μm equivalent
C5H12 (2,2-dimethylpropane)
Magnesium (Mg++), total aerosol
Cadmium (Cd), PM1
SO2
Manganese (Mn)
Nitrate (NO3-), PM2.5
Cloud ice (total column)
Cloud liquid water (CLW, total column)
CH3CCl3 (1,1,1-trichloroethane)
C14H10 (phenanthrene), in air and aerosol
Upper wind (X, Y components, horizontal)
Height of cloud base
Phosphorous (P), PM2.5
ClO (chlorine monoxide)
Object wetness duration
CS2 (Carbon disulfide)
Uranium (U), total aerosol
C6H14 (sum of methylpentanes)
Lead [Pb-210]
inapplicable
Lanthanum (La), total aerosol
C3H6O (acetone, propanone)
Fluoride (F-), total aerosol
C2O4= (oxalate, ethanedioate), PM1
CCN concentration at single supersaturation
Calcium (Ca++), PM10
Wind (surface wind direction and speed, horizontal) - deprecated
Chromium (Cr)
Cloud cover
Acetate (CH3COO-)
Light scattering coefficient, PM10
Uranium (U), PM2.5
Atmospheric density
C2Cl3F3 (1,1,2-trichloro-1,2,2-trifluoroethane, CFC-113)
Background luminance
C9H12 (1,3,5-trimethylbenzene)
Manganese (Mn), PM10
CH3I (methyliodide)
C5H10 (3-methyl-1-butene)
SF6
Arsenic (As), PM10
Cloud amount
C6H12O (hexanal isomers)
Ammonium (NH4+), PM10
Cobalt (Co), total aerosol
CH4 [C-13]
Mass concentration (total aerosol) or Mass TSP
C2Cl2F4 (1,2-dichlorotetrafluoroethane, CFC-114)
C14H10 (anthracene), in aerosol
C6H6Cl6 (1,2,3,4,5,6-hexachlorocyclohexane, alpha-lindane, alpha-HCH), in air
unknown
C3H2F6 (1,1,1,2,3,3-hexafluoropropane, HFC-236fa)
Direction of cloud movement
C18H12 (Benz(a)anthracene), in precipitation
Meteorological Optical Range
Diffuse solar radiation
Transport calculations (e.g., trajectories)
Thallium (Tl), total aerosol
Acidity-Alkalinity
C6H12 (methylcyclopentane)
Atmospheric pressure
Surface ozone
C2H6 (ethane)
C8H10 (ethylbenzene)
Visibility
Major inorganic components (coarse)
C4H8O (butan-2-one, methylethylketone)
Total carbon (coarse), PM10
Titanium (Ti), total aerosol
C18H12 (Benz(a)anthracene), in air and aerosol
Potassium (K+), total aerosol
Light absorption coefficient, PM10
Bromide (Br-)
Icing potential
Cloud optical depth
Type of low clouds
Aerosol dust concentration (mass)
Runway visual range
C2Cl4 (tetrachloroethene)
c-C5H10 (cis-2-pentene)
Hygroscopic growth factor, total aerosol
C5H8 (2-methyl-1,3-butadiene, isoprene)
Duration of precipitation
Potassium (K+), PM2.5
Cadmium (Cd), PM2.5
Lightning direction from station
Nickel (Ni)
Nitrite (NO2-), total aerosol
Sulphate (SO4=), total, PM10
C12H8Cl6 (aldrin), in air
Horizontal wind speed at specified distance from reference surface
Aluminium (Al)
C14H10 (phenanthrene), in total precipitation
Ammonia (NH3)
Long-wave radiation (direction unspecified)
Height of inversion
Rubidium (Rb), PM2.5