The volcano affected the environment by sending air pollution in the atmosphere
This is an impossible question to answer. There is a great number of volcanoes in Iceland. The most famous one is Mount Hekla. It has irrupted more then once though.
Ian is the volcano
If you mean the Eldfell, it is definitely a cinder cone volcano.
Yes, volcanic eruptions affect the volcano. The lava being pushed out and reforming affects the volcano's internal and external structure.