The use of small stationary passive samplers for aerosol particles to determine particulate matter (PM10-2.5) concentration in outdoor air is investigated. The passive sampler collects particles by gravity, diffusion and convective diffusion onto a glass substrate that is then examined with an optical microscope. The sensor employed was developed by University of North Carolina and RJLee Group, and it was calibrated vs a laser particle counter (ISO 21501) for periods up to a 15 days.
To investigate particulate matter concentrations in the greater Thessaloniki area a Work Group was initiated by the Technical Chamber of Greece (Northern Greece) in cooperation with the Municipality of Thessaloniki, with the following participants:
- Marc Assael and Kostas Kakosimos (Thermophysical Properties Laboratory, Chemical Engineering Dept. AUTh)
- Dimitri Mela (Laboratory of Atmospheric Physics, Physics Dept. AUTh)
- Kosta Karatza (Informatics Systems & Applications Group, Mechanical Engineering Dept. AUTh)
- Harisios Achillas (Laboratory of Heat Transfer & Environmental Engineering, Mechanical Engineering Dept. AUTh)
Accordind to this project, 20 such sensors wer placed in predetermined places in the city to investigate levels of concentrations of particulate matter. The results of these measurements can be found in www.airquality.gr.