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)
Cadmium (Cd), PM1
Integrated water vapour
Lithium (Li), PM2.5
H2O (as a chemical species)
Global solar radiation (upwelling)
UV-B radiation
C2H3O5N (peroxyacetylnitrate, PAN)
HF (hydrofluoric acid)
Magnesium (Mg++), PM10
CCN concentration at single supersaturation
Special phenomena
C16H10 (pyrene), in air and aerosol
Wind (surface wind direction and speed, horizontal) - deprecated
CH3CCl3 (1,1,1-trichloroethane)
Antimony (Sb), PM2.5
C12H8Cl6 (aldrin), in air
Uranium (U), total aerosol
NMHC
Major chemical components (size fractionated)
C18H12 (Benz(a)anthracene), in precipitation
Type of cloud
Selenium (Se), total aerosol
C4H6O (but-3-en-2-one, methylvinylketone)
Long-wave radiation (downwelling)
Lanthanum (La), total aerosol
Past weather
Height of cloud base
Light backscattering coefficient, total aerosol
Diffuse solar radiation
Beryllium [Be-7]
C2F6 (hexafluoroethane, PFC-116)
ClO (chlorine monoxide)
Calcium (Ca++), PM10
Mass concentration (total aerosol) or Mass TSP
Ammonium nitrate (NH4NO3), total aerosol
Aerosol volcanic ash (mass concentration)
C5H10O (pentanal, valeraldehyde)
C14H10 (phenanthrene), in air and aerosol
Phosphate (PO4---)
Titanium (Ti), total aerosol
UV Multiband
Cerium (Ce), PM2.5
Extinction coefficient
Lightning discharge energy
Nitrite (NO2-), total aerosol
Iron (Fe)
CHO2- (HCOO-, formate), in aerosol
C7H6O (benzene carbaldehyde)
Acidity-Alkalinity, total aerosol
Surface ozone
C6Cl6 (hexachlorobenzene, HCB), in air
CH2Cl2 (dichloromethane)
Elemental carbon, PM1
PSC occurrence
C13H10 (9H-fluorene, fluorene), in air
Hygroscopic growth factor, 50 μm equivalent
Rubidium (Rb), PM2.5
Ammonium (NH4+), PM10
i-C5H12 (2-methylbutane, iso-pentane)
C6H14 (3-methylpentane)
C2H6 (ethane)
C2H4F2 (1,1-difluoroethane, HFC-152a)
Cadmium (Cd), PM2.5
Object wetness duration
Chromium (Cr)
C2H3Cl2F (1,1-dichloro-1-fluoroethane, HCFC-141b)
Chloride (Cl-), PM2.5
Upper wind (X, Y components, horizontal)
Aerological soundings
Acetate (CH3COO-)
C2Cl4 (tetrachloroethene)
Sulphate (SO4=), total, PM10
Magnesium (Mg++), total aerosol
Icing potential
Runway visual range
C5H8 (cyclopentene)
C18H12 (Benz(a)anthracene), in aerosol
CS2 (Carbon disulfide)
Aluminium (Al)
Visibility
c-C5H10 (cis-2-pentene)
Major inorganic components (coarse)
CO2 [C-14]
Vanadium (V)
C6H12O (hexanal isomers)
inapplicable
Type of low clouds
C8H10 (p,m-xylene)
Strontium (Sr), total aerosol
Background luminance
C3H4O2 (2-oxopropanal, methylglyoxal)
Light scattering coefficient, PM10
C2Cl2F4 (1,2-dichlorotetrafluoroethane, CFC-114)
Ammonia (NH3)
n-C5H12 (n-pentane)
Intensity of precipitation
C5H12 (2,2-dimethylpropane)
C14H10 (phenanthrene), in total precipitation
C6Hn (n={14, 12}; sum of 2,2-dimethylbutane & methylcyclopentane
Nickel (Ni), PM10
Cloud amount
Hydrometeor type
Lightning discharge rates
Manganese (Mn)
Chloride (Cl-)
C8H10 (ethylbenzene)
Lightning distance from station
Long-wave radiation (direction unspecified)
Horizontal wind speed at specified distance from reference surface
NO2
C2H3O2- (CH3COO-, acetate), PM1
Total carbon (coarse), PM10
C5H10 (2-methyl-1-butene)
C14H10 (anthracene), in aerosol
Hygroscopic growth factor, total aerosol
Surface albedo
Aerosol dust concentration (mass)
Dew-point temperature (at specified distance from reference surface)
C6H14 (sum of methylpentanes)
Manganese (Mn), PM10
Tin (Sn), PM2.5
C2H3F3 (1,1,1-trifluoroethane, HCFC-143a)
Fluoride (F-), total aerosol
SO2
Vertical distribution of properties
Atmospheric density
C4H6 (1,3-butadiene, butadiene)
Effective radius of cloud hydrometeors
HCN (formonitrile, hydrogen cyanide)
Optical depth of fog
Potassium (K+), PM2.5
N2O
C4H8O (butan-2-one, methylethylketone)
Potassium (K+)
C5Hn (n={12, 10}; sum of n-pentane & cyclopentane)
C18H12 (Benz(a)anthracene), in air and aerosol
Arsenic (As), PM10
Mass concentration (coarse) or Mass PM10
Transport calculations (e.g., trajectories)
Sulphur (S)
Lead [Pb-210]
Light absorption coefficient, total aerosol
Ammonium (NH4+)
C9H12 (1,3,5-trimethylbenzene)
Thallium (Tl), total aerosol
C6H6Cl6 (1,2,3,4,5,6-hexachlorocyclohexane, gamma-lindane, gamma-HCH), in wet precipitation
Height of inversion
Nitrate (NO3-), PM2.5
C3H6O (acetone, propanone)
C14H10 (phenanthrene), PM10
Cloud cover
t-C4H8 (trans-2-butene)
Rate of ice accretion
C5H8 (2-methyl-1,3-butadiene, isoprene)
Aerosol column burden (mass density)
CH3I (methyliodide)
Sodium (Na+), PM10
C12H8Cl6 (aldrin), in air and aerosol
Meteorological Optical Range
Nickel (Ni)
Aerosol Extinction Coefficient
Bismuth (Bi), PM2.5
C6H6Cl6 (1,2,3,4,5,6-hexachlorocyclohexane, alpha-lindane, alpha-HCH), in air
NOy
C2O4= (oxalate, ethanedioate), PM1
C5H10 (3-methyl-1-butene)
Duration of precipitation
Wind (Z component, vertical)
Temperature profile
CCl3F (trichlorofluoromethane, CFC-11)
C3H2F6 (1,1,1,2,3,3-hexafluoropropane, HFC-236fa)
Cloud liquid water (CLW, total column)
CH3CN (acetonitrile)
Acidity-Alkalinity
Potassium (K+), total aerosol
Sum of ammonia (NH3) and ammonium (NH4+), in air and aerosol
Bromide (Br-)
Lightning direction from station
Cloud ice (total column)
Iron (Fe), total aerosol
Short-wave cloud reflectance
Uranium (U), PM2.5
SF6
C6H12 (methylcyclopentane)
Rubidium (Rb), total aerosol
Mass concentration (medium), PM2.5
C14H10 (phenanthrene), in aerosol
Direction of cloud movement
C2Cl3F3 (1,1,2-trichloro-1,2,2-trifluoroethane, CFC-113)
CO2 [O-18]
Carbonaceous-organic material (coarse), PM10
Cadmium (Cd), PM2.5 thru PM10
CH3O3S- (methanesulphonate), PM1
CH2F2 (difluoromethane, HFC-32)
Lightning density cloud-to-ground
Cobalt (Co), total aerosol
C5H10 (sum of pentenes)
Lightning discharge type (cloud to cloud, cloud to surface)
C2HCl3 (trichloroethene)
Sulphate (SO4=), total, PM2.5
Cloud optical depth
CBrClF2 (Halon 1211)
Hygroscopic growth factor, 165 μm equivalent
Atmospheric pressure
unknown
Phosphorous (P), PM2.5
Arsenic (As)
Sodium (Na+), total aerosol
i-C4H10 (2-methylpropane, iso-butane)
C12H8Cl6 (aldrin), in wet precipitation
Zinc (Zn), PM2.5
CH4 [C-13]
C2H2O2 (oxaldehyde, ethanedial)
Light absorption coefficient, PM10
Type of middle clouds
Observed variable - measurand (atmosphere)