GAW Central Facilities

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Variable	Quality Assurance/ Science Activity Centre (QA/SAC)	Central Calibration Laboratory (CCL)	World Calibration Centre (WCC)	Regional Calibration Centre (RCC)	World Data Centre (WDC)
CO2	JMA (Asia, South-West Pacific) Empa (Americas, Europe, Africa)	NOAA-GML	NOAA-GML (round robin) Empa (audits)		JMA
CO2 Isotopes		MPI-BGC			JMA
CH4	Empa (Americas, Europe, Africa) JMA (Asia, South-West Pacific)	NOAA-GML	Empa (Americas, Europe, Africa) JMA (Asia, South-West Pacific)		JMA
N2O		NOAA-GML			JMA
SF6		NOAA-GML	KMA		JMA
CFCs, HCFCs, HFCs		METAS (HFO-1234yf, HFC-125, CFC-13, HCFC-132b, 1,2-dichloroethane, HFO-1336mzz(Z), HFC-32, HFC-365mfc, CH₂Cl₂, CCl₄)			JMA
Surface Ozone	Empa	NIST	Empa	OCBA(South America)	NILU
CO	Empa	NOAA-GML	Empa		JMA
VOCs	UBA	NPL (Ethane, Propane, n-butane, isobutane, n-pentane, isopentane, Acetylene, Toluene, Benzene, Isoprene) NIST (monoterpenes) KRISS (DMS)	FZJ/IEK-8		NILU
NOx	UBA	NPL	FZJ(IEK-8)		NILU
SO2					NILU
H2		MPI-BGC			JMA
Precipitation Chemistry / Wet Deposition	NOAA-ARL (Americas)	ISWS	ISWS		NOAA-ARL
Total Ozone	Dobson instruments: JMA (Asia, South-West Pacific)	NOAA-GML (Dobson instruments) ECCC (Brewer instruments)	NOAA-GML (Dobson instruments) ECCC (Brewer instruments)	Dobson instruments: (general forum) BoM (Australia & Oceania) NOAA-ESRL JMA (Asia) DWD-MOHp (Europe) CHMI-SOO-HK (Europe) OCBA (South America) SAWS (Africa) Brewer instruments: IARC-AEMET (Europe) Filter instruments: MGO	ECCC (Ground based observations) DLR (Satellite based observations)
Ozone Profile	RMI	FZJ(IEK-8)	FZJ(IEK-8)		ECCC
UV Radiation			PMOD/WRC	NOAA-GML (Americas)	ECCC
Aerosol Physical Properties	UBA		IfT		NILU (Ground based observations) DLR (Satellite based observations)
Aerosol Optical Depth	UBA	PMOD/WRC (Precision Filter Radiometers)	PMOD/WRC		NILU (Ground based observations) DLR (Satellite based observations)
Aerosol Chemical Properties					NILU
Solar Radiation		PMOD/WRC	PMOD/WRC		MGO

BoM	Bureau of Meteorology, Melbourne, Australia (Regional Dobson Calibration Centre, RDCC for Australia)
BSRN	Baseline Surface Radiation Network, Federal Institute of Technology (ETH), Zürich, Switzerland
CHMI	Czech Hydrometeorological Institute
DLR	German Aerospace Centre, Oberpfaffenhofen, Wessling, Germany
DWD	German Meteorological Service (Deutscher Wetterdienst)
ECCC	Environment and Climate Change Canada, Toronto, Ontario, Canada
EML	Environmental Measurements Laboratory, Department of Energy (DoE), New York City, New York, USA
Empa	Swiss Federal Laboratories for Materials Testing and Research, Dübendorf, Switzerland
FZJ (IEK-8)	Forschungszentrum Jülich, Institute for Energy and Climate Research: Troposphere (IEK-8), Jülich, Germany
IARC-AEMET	Izaña Atmospheric Research Centre- State Meteorological Agency of Spain
IfT	Institute for Tropospheric Research, Leipzig, Germany
ISWS	Illinois State Water Survey, Champaign, Illinois, USA
JMA	Japan Meteorological Agency, Tokyo, Japan
KMA	Korea Meteorological Administration (KMA), Seoul, Republic of Korea
KRISS	The Korea Research Institute of Standards and Science, Republic of Korea
MGO	A.I. Voeikov Main Geophysical Observatory, Russian Federal Service for Hydrometeorology and Environmental, St. Petersburg, Russia
MOHp	Meteorologisches Observatorium Hohenpeißenberg, Germany
MPI-BGC	Max Planck Institute for Biogeochemistry, Jena, Germany
NILU	Norwegian Institute for Air Research, Kjeller, Norway
NIST	National Institute for Standards and Technology, Gaithersburg, MD, USA
NOAA-ARL	National Oceanic and Atmospheric Administration (NOAA), Air Resources Laboratory (ARL), College Park, Maryland, USA
NOAA-GML	National Oceanic and Atmospheric Administration (NOAA) , Global Monitoring Laboratory (GML) , Boulder, Colorado, USA
NPL	National Physical Laboratory, UK
OCBA	Observatorio Central Buenos Aires, Argentina
PMOD/WRC	Physikalisch-Meteorologisches Observatorium Davos/World Radiation Centre, Davos, Switzerland
SAWS	South African Weather Service, Pretoria, South Africa
SOO-HK	Solar and Ozone Observatory, Hradec Kralove, Czech Republic
UBA	German Environmental Protection Agency, Berlin, Germany