Toxicological

• Damby, D. E., Horwell, C. J., Larsen, G., Thordarson, T., Tomatis, M., Fubini, B., Donaldson, K., (2017), Assessment of the potential respiratory hazard of volcanic ash from future Icelandic eruptions: a study of archived basaltic to rhyolitic ash samples, Environmental Health, 16: 98, 10.1186/s12940-017-0302-9, Also Physicochemical sub-category - can we have two?

Physicochemical or geochemical

• Gislason, S. R., Hassenkam, T., Nedel, S., Bovet, N., Eiriksdottir, E. S., Alfredsson, H. A., Hem, C. P., Balogh, Z. I., Dideriksen, K., Oskarsson, N., Sigfusson, B., Larsen, G., Stipp, S. L. S., (2011), Characterization of Eyjafjallajokull volcanic ash particles and a protocol for rapid risk assessment, Proceedings of the National Academy of Sciences of the United States of America, 108(18), 7307-7312, 10.1073/pnas.1015053108