The Thissio Air Monitoring Station (Thissio AMS) is located at the central premises of the National Observatory of Athens in the historical center of Athens (Thissio area, 37.97°N, 23.72° E, 105m a.s.l.) overlooking the Attica basin and at approximately 50m above the mean city level. The location (on top of the hill of the Nymphs) is ideal for the characterization of urban background air quality conditions, as the station overlooks the city center and serves as a receptor point of aerosols from various urban and regional sources. It is surrounded by a pedestrian zone, a moderately populated residential area and the Filopappou (108m a.s.l) and Acropolis hills (150m a.s.l) at distances of 500m and 800m, respectively. There are no major roads within a radius of 500m.

The station, as part of the PANACEA and ACTRIS infrastructures (in national and international level respectively), is organized and operates according to an integrated strategic plan aiming at high quality and resolution measurements, in order to provide near real time information on urban air quality to citizens, state and private bodies. It operates systematically for the study of atmospheric pollution throughout the year, but also for the monitoring of smog events during the winter months. The main goals of the station include the study of aerosols chemical composition, physical characteristics and optical properties, in order to investigate their sources within the urban environment of Athens, their production and transport processes over the Eastern Mediterranean, their climatic role and their impacts on health and ecosystems.

The station is equipped with specialized on line high resolution analyzers for: major gaseous (CO, NO, NO2, SO2, O3) and particulate pollutants (PM1, PM2.5, PM10, BC and its BCff-BCwb fractions), aerosol scattering and size distribution, fine aerosol non-refractory chemical speciation and ionic composition. High and low volume samplers for different size fractions (PM2.5 and/or PM10) are utilized and the filter samples are analyzed at the Atmospheric Chemistry Laboratory (ACL). In collaboration with the University of Crete (and other research and academic institutions), the Thissio AMS operates in general as a hub for highly specialized atmospheric measurements by hosting cutting edge equipment for continuous on-line monitoring and organizing in-situ campaigns.


 The following instruments are in continuous operation in the Thissio AMS:



Carbon Monoxide (CO)

Analyzer APMA-360, Horiba Ltd.

Nitrogen Oxides (ΝΟx)*

Analyzer APNA-360, Horiba Ltd.

Sulphur Dioxide (SO2)*

Analyzer APSA-360, Horiba Ltd.

Ozone (Ο3)

Analyzer 49-i, Thermo Scientific

Particulate Matter PM10

Beta gauge particulate  monitor FH 62 I-R, Eberline

Particulate Matter PM1, PM2.5,PM10

Μodel 11-D, Grimm Aerosol Technik

Black Carbon (ΒC)  – Aerosol Absorption

Aethalometer 7-λ, Model ΑΕ33, Magee Scientific

Black Carbon, ΒC*

5012 Multi Angle Absorption Photometer MAAP, Thermo Scientific

Aerosol Scattering

Integrating Nephelometer model 3563, TSI

Aerosol number size distribution

Model 3034 Scanning Mobility Particle Sizer-SMPS, TSI

Particle Number Concentration

Model 3010 Condensation Particle Counter, TSI Inc.

Chemical composition of non-refractory submicron aerosol  (Organics, Cl-, NO3-, SO42- και NH4+)

Aerosol Chemical Speciation Monitor-ACSM, Aerodyne Inc.

ΡΜ1 ionic composition (cations)

Particle-Into-Liquid-Sampler - Ion Chromatograph, PILS - IC, Metrohm – Dionex

Sequential low volume aerosol sampler (ΡΜ2.5, ΡΜ2.5-10)

Dichotomous Partisol – Plus, Model 2025 Sequential Air Sampler, ThermoScientific

Sequential low volume aerosol sampler (ΡΜ2.5 or ΡΜ10)

Sampler LVS 3.1 – PNS 15, Derenda

High volume aerosol sampler (ΡΜ2.5)

DIgitel DH-77


Congrego v.4.0.1, Ecotech


* Equipment also used in the Mobile Air Quality Monitoring Station per instance