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Timeline of the latest releases
last update March, 2025
07th of May, 2025

Performance & evaluation criteria for calibration workshops & ACTRIS compatibility


On May 2025, the "Performance & evaluation criteria for calibration workshops & ACTRIS compatibility" for the following instruments are updated:

- Neutral cluster and Air Ion Spectrometer
- Particle Size Magnifier

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24th of April, 2025

Report guidance to produce eBC concentrations from NRT ACTRIS absorption measurements


This report pictures the methodology established to produce equivalent black carbon mass concentration (eBC) in near real-time (NRT) from absorption coefficients measured by online monitors, such as the Multi-Angle Absorption Photometer (MAAP) or the various Aethalometer models (e.g., AE33) installed at fixed observatory platforms. These instruments are referred here as Filter Absorption Photometers (FAPs).

access to the document
22th of January, 2025

Performance & evaluation criteria for calibration workshops & ACTRIS compatibility


On January 2025, the "Performance & evaluation criteria for calibration workshops & ACTRIS compatibility" for the following instruments are updated:

- CEN Condensation Particle Counter (CPC)
- Integrating Nephelometer (IN)
- Absorption Photometer (AP)
- Nano Condensation Particle Counter (Nano CPC)
- Cloud Condensation Nuclei Counter
- CEN Mobility Particle SizeSpectrometer (MPSS)
- Aerodynamic Particle Size Spectrometer (APSS)

20th of December, 2024

ACTRIS ERIC compliant aerosol in‐situ instruments v1.5 December 2024


The ACTRIS aerosol in‐situ instruments
compliance is updated on 20th of December, 2024.

update: v1.1 is released on April 18, 2024
update: v1.2 is released on April 19, 2024
update: v1.4 is released on April 30, 2024
update: v1.5 is released on December 20, 2024

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12th of January, 2024

The final version of "General ACTRIS & GAW recommendation document" is now published


Recommendation:

On January 2024, the "ACTRIS standard procedures for aerosol in-situ measurements" has been finalised. The document is now public.

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Recommendations, guidelines, standard operating procedures and scientific articles for aerosol in-situ measurements
last update March, 2025

last update December 20, 2024
Aerosol inlets and conditioning
last update June 2021
Particle number concentration > 10 nm
last update January 2025
Mass concentration of particulate organic tracers
last update
World Calibration Centre for Aerosol Physics (WCCAP)
The WCCAP was founded in 2002 to serve as a competence center for in-situ physical and optical aerosol measurements as part of the world-wide GAW-program of the WMO. This WCCAP is world-wide unique for the quality assurance of physical and optical in-situ aerosol measurements and station audits to improve infrastructures.
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
CAIS-ECAC
Center for Aerosol In-Situ - European Center for Aerosol Caliibration and Characterization
CAIS-ECAC
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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