Vog can be nasty stuff. Also accelerates the rusting of metal. This for example:
"The plow was mirror-shiny after the summer and nothing has happened to it since. When I went to check it it had become as brown as it is. I noticed the same thing on my tow hitch...". The environmental ministry confirmed that the vog was the reason for his rapid rusting. Note how even the rust is and the lack of pitting; this isn't old metal.
We also had really high rates of sheep deaths after the last eruption. They never really found out why, but it seems that not only did the eruption hinder grass growth, but may also have left it less nutritious or covered in dust that was harmful to the sheep.