This is an innovative way to measure aerosols and water colour based on a mobile app and a small optical add-on containing a spectrometer and a polarizer. This instrument measures properties of small particles in the sky: aerosols. It measures PM 2.5 values and water colour. The idea is based on the Spectropolarimeter for Planetary Exploration (SPEX), sized down to allow as many people as possible to use the instrument.

The app and add on are currently in development and it will be fully operational in 2021. Additionally, the DDQ team is upgrading the add-on and sensor capabilities to monitor air and water quality properties.


Dutch, English

Geographical coverage

Local, National, European, International.

Coordination and funding

iSPEX started on 2015, is owned by Leiden University and DDQ develops the software.