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Welcome to the
Center for Aerosol In-Situ - European Center for Aerosol Calibration and Characterization

In the frame of the European Research Infrastructure ACTRIS-ERIC, the European Center for Aerosol Calibration and Characterization (CAIS-ECAC) is one of the Central Facilities for the ACTRIS National Facilities and external users worldwide. CAIS-ECAC’s mission is to offer operational support for quality assured and controlled physical and chemical aerosol in situ measurements & sampling, to conduct traceable instrument calibration, and to perform laboratory analysis of aerosol samples. Furthermore, CAIS-ECAC develops and offers Near-Real-Time tools for fast data submission and central quality control.

CAIS-ECAC is a consortium, consisting of seven facilities. The WCCAP (World Calibration Center for Aerosol Physics), PACC (Prague Aerosol Calibration Center), and CCC (Cluster Calibration Center) are responsible for aerosol microphysical and optical aerosol variables. The OCTAC-CC (Organic Tracer and Aerosol Constituents - Calibration Center), ERLAP (European Reference Laboratory for Air Pollution), the ACMCC (Aerosol Chemical Monitor Calibration Center) and EMC2 (Element Mass Calibration Center) are in charge of the chemical & elemental aerosol variables.
To visit the CF and the workshops, please click on the icon.



which consists of
Seven Central Facilities




and is responsible for 65 National Facilities in 18 countries in Europe.
Events
Hyytiälä Autumn School 2025 ACTRIS Week 2025

Hyytiälä Autumn School 2025




Event: Autumn School 2025
Location: Hyytiälä forest station, Finland
Date: 06 October – 17 October, 2025

Workshop announcement
OGTAC-CC WCCAP




The Central Facility OGTAC-CC in Leipzig, Germany is hosting the next
hands-on training workshop in:

  • November 24 - November  28, 2025




Activity &
Newsletter


Measurement
     Guidelines

last update September 25, 2025

Aerosol inlets and conditioning
last update June 2021

Particle number concentration > 10 nm
last update January 2025
Labeling Process Step 1A - initial acceptance
The labeling process for a ACTRIS National Facility consists of several steps:

  • step 1a (initial acceptance)
  • step 1b (performance evaluation after 2 consecutive years of operation)
  • step 1c (review approval and obtaining the ACTRIS label)
  • step 2 (regular re-evaluation)

Here we explain the procedure of the step 1a, the initial acceptance, at CAIS-ECAC.
Procedure Of The Labeling
Operational Support
Operational support which is organized by CAIS-ECAC on regular basis:
Operational Support
Instrument
Frequency
Modality of provision
Calibration Workshops at CAIS-ECACMicrophysical & optical instrumentsbiannuallyCall launched by CAIS-ECAC
Round-Robin-Tests at CAIS-ECAC
OC/EC
Organic tracers
Element analysis
annuallyCall launched by CAIS-ECAC
NF auditsNot regularCall launched by CAIS-ECAC



Labeling   
Process


Blog
OGTAC-CC ACTRIS Traning
OGTAC-CC call for ACTRIS related training activities on organic tracers and aerosol constituents within the framework of the CAIS-ECAC

The OrGanic Tracers and Aerosol Constituents - Calibration Centre (OGTAC-CC), hosted and operated by TROPOS ACD as one TC unit of the CAIS-ECAC consortium, is announcing the following activity for all operators of ACTRIS NFs (observational and exploratory platforms) as well as to all other interested scientists, engineers, technicians and students:

Topic:
Theory and practice – Offline chromatographic (LC-MS and GC-MS) determination of organic tracer compounds and organic and elemental carbon (OC/EC) measurements in particulate matter collected on filters

Issued by: OGTAC-CC/ Falk Mothes
Workshop week: Monday 24/11/2025 to 28/11/2025
Registration should take place before November 5th 2025.
Published by OGTAC-CC - 26 Aug 2025
Report guidance to produce eBC concentrations from NRT ACTRIS absorption measurements
Report guidance to produce eBC concentrations from NRT ACTRIS absorption measurements

Issued by: Ineris / Olivier FAVEZ
Date: 24/10/2024
Ref: CAMS2_21a_2022SC1_D21a.1.1.1_202310_eBC method_v1.1
Published by CAIS-ECAC - 24 Apr 2025
ACTRIS - CAIS-ECAC - Aerosol In-Situ Course: Fundamentals & Methods for Aerosol Sampling and Physical & Chemical In-Situ Measurements
From March 15th on, CAIS-ECAC will host the "Aerosol In-Situ Course: Fundamentals & Methods for Aerosol Sampling and Physical & Chemical In-Situ Measurements" in Kosetice with 17 participents.

We wish all participants a successful aerosol course.

Your CAIS-ECAC team
Published by CAIS-ECAC - 14 Mar 2025
OGTAC-CC call for ACTRIS related training activities on organic tracers and aerosol constituents within the framework of the CAIS-ECAC
OGTAC-CC call for ACTRIS related training activities on organic tracers and aerosol constituents within the framework of the CAIS-ECAC

The OrGanic Tracers and Aerosol Constituents - Calibration Centre (OGTAC-CC), hosted and operated by TROPOS ACD as one TC unit of the CAIS-ECAC consortium, is announcing the following activity for all operators of ACTRIS NFs (observational and exploratory platforms as well as to all other interested scientists, engineers and technicians:

read more....

Published by OGTAC-CC - 21 Jan 2025
Call for 4th Proficiency Testing Scheme (PTS) for PM10 and PM2.5 mass concentration measurements
INVITATION LETTER

PROFICIENCY TESTING SCHEME
FOR PARTICULATE MATTER MASS CONCENTRATION
JRC ISPRA – ITALY, JANUARY-FEBRUARY 2025
Published by ERLAP - 07 Oct 2024

WCCAP - GRIMM-CPCs

WCCAP - GRIMM-CPCs

WCCAP - GRIMM-CPCs

WCCAP - GRIMM-CPCs

CCC - NAIS

CCC - PSM

CCC - PSM

CCC - NAIS

WCCAP - CCN

WCCAP - CCN

OGTAC-CC

OGTAC-CC

OGTAC-CC

OGTAC-CC

OGTAC-CC

OGTAC-CC

OGTAC-CC

Round-Robin

Round-Robin

Round-Robin

Round-Robin

Round-Robin

Round-Robin

Round-Robin

WCCAP - MPSS

WCCAP - MPSS

WCCAP - MPSS

WCCAP - MPSS

WCCAP - MPSS

Round-Robin

UBA-Schneefernerhaus

WCCAP

WCCAP

WCCAP

WCCAP

WCCAP

WCCAP

WCCAP

WCCAP



Gallery


Contact












CONTACT
ABOUT US
Monday, Tuesday, Wednesday, Thursday
9.00am – 12.00pm, 1.00pm – 4.00pm

Friday
9.00am – 12.00pm, 1.00pm – 2.00pm

Saturday , Sunday
closed
Center for Aerosol In-Situ - European Center for Aerosol Caliibration and Characterization
CAIS-ECAC

director: Alfred Wiedensohler
office: Stephanie Schüttauf

Leibniz Institute for Tropospheric Research
Permoserstraße 15
04318 Leipzig
e-mail: wccap[@]tropos.de
In the frame of the European Research Infrastructure ACTRIS-ERIC, the CAIS-ECAC is one of the Central Facilities for the ACTRIS National Facilities and external users worldwide. CAIS-ECAC’s mission is to offer operational support for quality assured and controlled physical and chemical aerosol in situ measurements & sampling, to conduct traceable instrument calibration, and to perform laboratory analysis of aerosol samples.
OFFICE HOURS

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