@idefix37 Hey, Thanks a lot! That information helped. I was actually looking for another source to get severe data on the volcano emission. The amount of SO2 measured by the air quality stations actually stayed the same within the last few days - despite the fact that the volcano changed its behaviour, we had changes in weather as well and the air quality also felt different within these days. So ... could you help me out with another source to check on the amount of SO2?