At the Ajdovščina platform a Cyanometer has been set up, a monolith measuring the blueness of the sky and showing the quality of air. The installation, an instrument for awareness raising with regard to the quality of air, has been erected as one of the actions within the framework of the title Ljubljana, European Green Capital 2016.

Cyanometer is a tool that was created in 1789 by the Swiss physicist and alpinist Horace-Bénédict de Saussure who wanted to measure the blueness of the sky to predict the weather. The over three metres high installation designed by Martin Bricelj Baraga set up in the centre of Ljubljana until the end of the year plays homage to the original cyanometer.
The cyanometer is connected to the measuring station ARSO (Slovenian Environmental Agency) Ljubljana Bežigrad and so it displays in real time the level of air pollution.

It is a monument and a program periodically photographing the sky. The photos are then loaded to a website where the appropriate shade of blue is identified on the Saussure’s colour scale. The cyanometer is completely energy self-sufficient as it using solar energy for its operation.