Name	Notation	Description	Types	Status
Human observation	24		Concept	stable
(Optical) filter Instrument	58		Concept	stable
(Ruler for) rain gauge	59		Concept	stable
(Ultra)sonic anemometer	60		Concept	stable
Adsorption - scintillation counting	62		Concept	stable
Aerovane (wind vane with propeller)	63		Concept	stable
Alpha counting	64		Concept	stable
Anemometer [general]	65		Concept	stable
Aneroid barometer (evacuated capsule)	66		Concept	stable
Anion exchange membrane (AEM)	67		Concept	stable
Atmometer	68		Concept	stable
Atmospherics ('sferics') detection	69		Concept	stable
Atomic absorption spectrophotometry (AAS)	70		Concept	stable
Atomic emission spectrophotometry (AES)	71		Concept	stable
BSRN compliant instrument	72		Concept	stable
Barometer, mercury column	73		Concept	stable
Barometer, mercury-free column	74		Concept	stable
Beta counting	75		Concept	stable
Bimetal thermometer	76		Concept	stable
Bowen-ratio method	77		Concept	stable
Brewer	78		Concept	stable
Brewer-GDR	79		Concept	stable
Brewer-Mast Sonde	80		Concept	stable
Capacitive rain sensor	82		Concept	stable
Capillary electrophoresis (CE)	83		Concept	stable
Carbon-Iodine Sonde (KC Sonde)	84		Concept	stable
Colorimetric titration (Gran method)	87		Concept	stable
Colorimetric titration [general]	88		Concept	stable
Colorimetry (Saltzman)	90		Concept	stable
Colorimetry (thorin)	91		Concept	stable
Conductometry	94		Concept	stable
Cup anemometer	95		Concept	stable
Cup anemometer (3 or 4 cups)	96		Concept	stable
Cuvette	97		Concept	stable
Denuder	98		Concept	stable
Denuder	99		Concept	stable
Disdrometer (drop spectrographs)	102		Concept	stable
Disjunct eddy covariance method	103		Concept	stable
Dissipation method	105		Concept	stable
Dobson	106		Concept	stable
ECC Sonde	107		Concept	stable
Eddy accumulation method	108		Concept	stable
Eddy covariance method	109		Concept	stable
Electric conductivity (EC meter)	110		Concept	stable
Electronic pressure transducer (silicon diaphragm)	111		Concept	stable
Estimation from visual observation	112		Concept	stable
Evaporation pan and-or tank	113		Concept	stable
Faraday cup photochemistry	114		Concept	stable
Filter sampling + alpha counting	115		Concept	stable
Filter sampling + gamma spectrometry	116		Concept	stable
Flame-ionization detector (FID)	119		Concept	stable
Flask sampling (analytical method unspecified)	120		Concept	stable
Flow injection analyzer (FIA)	121		Concept	stable
Flux variance method	123		Concept	stable
Gradient method	125		Concept	stable
Gravimetry [general]	127		Concept	stable
High Performance Liquid Chromatography (HPLC)	129		Concept	stable
Hot wire anemometer	130		Concept	stable
Hypsometer (water boiling point)	132		Concept	stable
ICP-AES	133		Concept	stable
ICP-MS	134		Concept	stable
Indian Sonde	135		Concept	stable
Interferential method	136		Concept	stable
Ion Chromatography (IC) [general]	137		Concept	stable
Doppler wind lidar	142	Light detection and ranging (lidar) with Doppler capability (...	Concept	stable
Raman lidar	143	Light detection and ranging (lidar) with Raman capability, ty...	Concept	stable
Liquid-in-glass thermometer (mercury-free)	144		Concept	stable
Lysimeter	146		Concept	stable
Mass balance method	147		Concept	stable
Mercury-in-glass thermometer	149		Concept	stable
Microbarometer (dewar)	150		Concept	stable
Microtops	151		Concept	stable
Microtops	152		Concept	stable
Microtops	153		Concept	stable
Microwave profiler	154		Concept	stable
Microwave radiometry	155		Concept	stable
Microwave radiometry	156		Concept	stable
NILU_O_2	157		Concept	stable
NILU_O_3	158		Concept	stable
Ozone sonde (unspecified)	166		Concept	stable
Passive Samplers [general]	167		Concept	stable
Photoacoustic detection	168		Concept	stable
Pluviograph	170		Concept	stable
Potassium iodide (KI) method	171		Concept	stable
Potentiometry (ion-selective electrode)	172		Concept	stable
Potentiometry (pH meter)	173		Concept	stable
Pressure balance (piston)	174		Concept	stable
Pressure plate (solid blade)	175		Concept	stable
Pressure tube	176		Concept	stable
Propeller anemometer	177		Concept	stable
Pyranometer (measurement of IR radiation)	179		Concept	stable
Pyrradiometer (total global, UV+IR)	180		Concept	stable
Radio acoustic sounding system (RASS)	181		Concept	stable
Radio acoustic sounding system (RASS)	182		Concept	stable
Radio detection and ranging (Radar)	183		Concept	stable
Radio detection and ranging (Radar) profiler	184		Concept	stable
Radiochemical Methods [general]	185		Concept	stable
Regener Sonde (chemiluminescence)	186		Concept	stable
Resistance thermometer, thermistor	188		Concept	stable
SAOZ (UV-vis diode array spectrometer)	189		Concept	stable
Scatterometer	190		Concept	stable
Separation + manometric determination	191		Concept	stable
Sonic thermometer	195		Concept	stable
Sound detection and ranging (Sodar) profiler	196		Concept	stable
Sunphotometry-Filter Radiometry	197		Concept	stable
Sunshine duration	198		Concept	stable
Surface chamber	199		Concept	stable
Thermocouple, thermopile	201		Concept	stable
Tipping bucket rain gauge (totalizer)	204		Concept	stable
Titration	205		Concept	stable
Transmissometer	207		Concept	stable
Transport modeling (model unspecified)	208		Concept	stable
Turbidity measurement	209		Concept	stable
Umkehr method	210		Concept	stable
Volumetric measurement	211		Concept	stable
Weighing type rain gauge (totalizer)	212		Concept	stable
Wet Chemical Methods [general]	213		Concept	stable
Wind sock (textile tube)	214		Concept	stable
Wind vane (solid blade)	215		Concept	stable
Aerodyne mass spectrometer (AMS)	217		Concept	stable
EUSAAR protocol	218		Concept	stable
Filter + beta attenuation (betameter, beta gauge)	219		Concept	stable
Filter + light attenuation (aethalometer)	220		Concept	stable
Mass Spectrometry (MS) [general]	221		Concept	stable
Monitor for AeRosols and GAses (MARGA)	222		Concept	stable
Particle induced x-ray emission (PIXE)	223		Concept	stable
Particle soot absorption photometry (PSAP)	224		Concept	stable
Thermo-optical analyzer (Sunset Labs)	225		Concept	stable
X-ray fluorescence (XRF)	226		Concept	stable
Aerodynamic particle sizing spectrometer (APS)	227		Concept	stable
Aerosol backscatter sonde	228		Concept	stable
Light scattering	229		Concept	stable
Nephelometry, integrating	230		Concept	stable
Cloud condensation nuclei (CCN) counter	231		Concept	stable
Condensation particle counter (CPC)	232		Concept	stable
Continuous gravimetry	233		Concept	stable
Differential mobility particle sizer (DMA, DMPS)	234		Concept	stable
Diffusion battery	235		Concept	stable
Electric mobility [general]	236		Concept	stable
Electrostatic classifier	237		Concept	stable
Multiangle absorption photometry (MAAP)	238		Concept	stable
Multistage impactor	239		Concept	stable
Optical particle counter (OPC)	240		Concept	stable
Scanning mobility particle sizer (SMPS)	241		Concept	stable
Twomey static thermal diffusion chamber	242		Concept	stable
Sun-tracking photometry	244		Concept	stable
Ceilometer	245		Concept	stable
Flexpart (dispersion modeling)	246		Concept	stable
Flextra (trajectory modeling)	247		Concept	stable
Hysplit (trajectory modeling)	248		Concept	stable
Lagranto (trajectory modeling)	249		Concept	stable
Thin film capacitance	250		Concept	stable
Chilled mirror	251		Concept	stable
Lithium chloride (LiCl)	252		Concept	stable
Hair hygrometer-hygrograph	253		Concept	stable
Hygrometer [general]	254		Concept	stable
IR absorption hygrometer	255		Concept	stable
Optical hygrometer	256		Concept	stable
UV fluorescence-based hygrometer (Lyman-α)	257	Detection of UV fluorescence signal emitted by the excited OH...	Concept	stable
Electrical aspiration (Frankenberger type)	258		Concept	stable
Mechanical aspiration	259		Concept	stable
Bimetallic actinograph	263		Concept	stable
Pyrheliometer (direct solar, broadband)	264		Concept	stable
Pyrgeometer (global, infrared)	265		Concept	stable
Pyranometer (global solar, broadband)	266		Concept	stable
Spectral pyranometer	267		Concept	stable
UV-vis spectrometry-radiometry	268		Concept	stable
Tetrachloromercurate (TCM) absorption - CL	270		Concept	stable
Colorimetry (ANSA)	271		Concept	stable
Colorimetry (Griess)	272		Concept	stable
Colorimetry (indophenol, Bertholet)	273		Concept	stable
Colorimetry (mercury thiocyanate+iron alum)	274		Concept	stable
Colorimetry (NEDA)	275		Concept	stable
Colorimetry (Nessler, K2HgI4)	276		Concept	stable
Colorimetry (sodium salicylate method for nitrate)	277		Concept	stable
Colorimetry [general]	278		Concept	stable
Filter sampling (analytical method unspecified)	279		Concept	stable
Adsorption tube (charcoal) + elution + GC	280		Concept	stable
Filter sampling + combustion + IC	281		Concept	stable
Filter sampling + combustion + other	282		Concept	stable
Filter sampling + extraction + IC	283		Concept	stable
Filter sampling + extraction + other	284		Concept	stable
Filter sampling + gravimetry	285		Concept	stable
Impregnated filter	286		Concept	stable
Catalytic conversion 'Au' - CL	287		Concept	stable
Catalytic conversion 'Fe' - CL	288		Concept	stable
Catalytic conversion 'Mb' - CL	289		Concept	stable
Chemiluminescence (CL) [general]	290		Concept	stable
Photolytic conversion - CL	291		Concept	stable
Monitor for AeRosols and GAses (MARGA) Metrohm	292		Concept	stable
Filter sampling + photo multiplier tube (PMT)	293		Concept	stable
Fluorescence [general]	294		Concept	stable
UV fluorescence	295		Concept	stable
Vacuum UV fluorescence	296		Concept	stable
Gas Chromatography (GC) [general]	297		Concept	stable
GC-ECD	298		Concept	stable
GC-ECD-FID	299		Concept	stable
GC-ECD-MS	300		Concept	stable
GC-FID	301		Concept	stable
GC-HgO reduction-UV absorption	302		Concept	stable
GC-MS	303		Concept	stable
H2O2 conversion - IC	304		Concept	stable
Cavity ring-down spectroscopy (CRDS)	305		Concept	stable
Cavity-enhanced absorption spectroscopy (CEAS)	306		Concept	stable
Integrated cavity output spectroscopy (ICOS)	307		Concept	stable
Laser induced fluorescence (LIF)	308		Concept	stable
Laser photoacoustic spectroscopy (LPAS)	309		Concept	stable
Laser spectroscopy [general]	310		Concept	stable
Quantum cascade laser (QCL) spectroscopy	311		Concept	stable
Chemical ionization MS (CIMS) with matrix isolation	312		Concept	stable
Proton transfer reaction mass spectrometry (PTR-MS)	313		Concept	stable
IR spectrometry-radiometry [general]	314		Concept	stable
Light absorption photometry	315		Concept	stable
Long path absorption photometry (LOPAP)	316		Concept	stable
Non-dispersive IR (NDIR) absorption	317		Concept	stable
Non-dispersive UV (NDUV)	318		Concept	stable
UV absorption spectrometry-radiometry	319		Concept	stable
Integrated path differential absorption (IPDA) lidar	320	Light detection and ranging (lidar) with integrated path diff...	Concept	stable
Differential optical absorption (DOAS)	321		Concept	stable
Fourier-transform IR spectroscopy (FTIR)	322		Concept	stable
TCCON Fourier-transform IR spectroscopy (TCCON-FTIR)	323		Concept	stable
Radiosonde with NAVAID	327		Concept	stable
Radiosonde with radar tracking	328		Concept	stable
Radiosonde with radiotheodolite tracking	329		Concept	stable
Radiosonde with composite method tracking	330		Concept	stable
Radiosonde (tracking unspecified)	331		Concept	stable
Pilot balloon with optical tracking)	332		Concept	stable
Differential absorption lidar (DIAL)	335	Light detection and ranging (lidar) with differential absorpt...	Concept	stable
Microwave radiometry	336		Concept	stable
Tunable diode lase spectroscopy (TDLS)	338	Tunable diode lase spectroscopy (TDLS)	Concept	stable
UV spectroradiometry	339		Concept	stable
Wet-bulb thermometer	340	A thermometer having a bulb that is kept moistened when humid...	Concept	stable
Backscatter lidar	341	Elastic backscatter light detection and ranging (lidar) typic...	Concept	stable
High spectral resolution (HSR) lidar	342	Light detection and ranging (lidar) with high spectral resolu...	Concept	stable
Fog collection	343	Collection of fog using a mesh or similar capturing device an...	Concept	stable
GC-CVAFS	344	Gas chromatography and detection by cold vapour atomic fluore...	Concept	stable
GC-TCD	345	Gas chromatography and detection by a thermal conductivity de...	Concept	stable
Electrostatic collection + alpha counting	346	Alpha counting after electrostatic collection of measurand.	Concept	stable
Tunable Infrared Laser Differential Absorption Spectroscopy (TILDAS)	347	Tunable Infrared Laser Differential Absorption Spectroscopy (...	Concept	stable
Radionuclide decay counting [general]	348	Determination of the counts measured per unit time as a resul...	Concept	stable
IR-GFC	349	Infrared absorption measurement based on the gas-filter corre...	Concept	stable
inapplicable	inapplicable	None of the codes in the table are applicable in the context ...	Concept	stable
unknown	unknown	The measurement/observing method is unknown.	Concept	stable