Commentaries: Art. 24

It is prohibited to release free-flying balloons:
1. filled with combustible gas;
2. carrying a load exceeding 2kg;
3. with a volume exceeding 30m³.
The following restrictions apply within a distance of 5km from the runways of any civil or military aerodrome:
1. the volume of the balloon may not exceed 1m³;
2. No balloons with an open flame (sky lantern) or with an attached payload may be released, with the exception of competition response cards not exceeding A5 size that are attached to the balloons;
3. No more than 300 balloons may be released at the same time.
4. the balloons may not be tied together.