Dr Andrew Allen

Research Scientist

Departamento de Química Analítica
Instituto de Química, Universidade Estadual Paulista,

UNESP, CP 355, 14801-970 - Araraquara, SP, Brazil
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Research Expertise


Atmospheric processes including: volcanic plume chemistry; marine aerosols; biomass burning; agricultural emissions; air pollution in indoor and outdoor environments.
Development of active and passive measurement techniques for tropospheric gases and particulates including HF, HCl, SO2, HNO3, NH3, H2S, acid aerosols.
Current applications include studies of the roles of natural and anthropogenic aerosols in modifying weather and climate at different scales, and the influence of atmospheric deposition on nutrient cycling and availability.


Relevant Publications


Martin, R. S., Mather, T. A., Pyle, D. M., Power, M., Tsanev, V. I., Oppenheimer, C., Allen, A. G., Horwell, C. J. & Ward, E.P.W. (2009) 'Size distributions of fine silicate and other particles in Masaya's volcanic plume', Journal of Geophysical Research – Atmospheres, 114, D9.

Martin, R.S., Mather, T.A., Pyle, D.M, Power, M., Allen, A.G., Aiuppa, A., Horwell, C.J. and Ward E.P.W. (2008) ‘Composition-resolved size distributions of volcanic aerosols in the Mt. Etna plumes’, Journal of Geophysical Research – Atmospheres, 113, D17, Art. No. D17211.

Aiuppa, A., Franco, A., Glasow, R., Allen, A., D'Alessandro, W., Mather, T., Pyle, D. and Valenza, M. (2007) ‘The tropospheric processing of acidic gases and hydrogen sulphide in volcanic gas plumes as inferred from field and model investigations’, Atmos. Chem. Phys., 7, 1441-1450.

Allen, A.G., Mather, T.A., McGonigle, A.J.S., Aiuppa, A., Delmelle, P., Davison, B., Bobrowski, N.,Oppenheimer, C., Pyle, D.M. and Inguaggiato, S. (2006) ‘Sources, size distribution and downwind grounding of aerosols from Mt. Etna’, J. Geophys. Res., 111, D10302.

Horwell, C. J., Patterson, J. E., Gamble, J. A. & Allen, A. G. (2005) 'Monitoring and mapping of hydrogen sulphide emissions across an active geothermal field: Rotorua, New Zealand'Journal of Volcanology and Geothermal Research, 139(3-4), 259-269.

Horwell, C. J., Allen, A. G., Mather, T. A. & Patterson, J. E. (2004) 'Evaluation of a simple passive sampling technique for monitoring volcanogenic hydrogen sulphide', Journal of Environmental Monitoring, 6, 630-635.

Mather, T.A., Pyle, D.M. and Allen, A.G. (2004) ‘Volcanic source for fixed nitrogen in the early Earth's atmosphere’, Geology, 32, 905-908.

Mather, T.A., Allen, A.G., Davison, B.M., Pyle, D.M., Oppenheimer, C. and McGonigle, A.J.S. (2004) ‘Nitric Acid Production at Volcanoes’, Earth Planet. Sci. Lett., 218 (1-2), 17-30.

Mather, T. A., Allen, A. G., Oppenheimer, C., Pyle, D.M., & McGonigle, A.J.S. (2003) 'Size resolved particle compositions of the tropospheric plume of Masaya volcano, Nicaragua', Journal of Atmospheric Chemistry, 46(3), 207-237. 

Mather, T.A., Oppenheimer, C., Allen A.G. and McGonigle A.J.S. (2004) ‘Aerosol chemistry of emissions from three contrasting volcanoes in Italy’, Atmos. Environ., 38, 5637-5649.

Allen, A. G., Oppenheimer, C., Ferm, M., Baxter, P. J., Horrocks, L. A., Galle, B., McGonigle, A. J. S. & Duffell, H. J. (2002) 'Primary sulfate aerosol and associated emissions from Masaya Volcano, Nicaragua', Journal of Geophysical Research-Atmospheres, 107(D23), 8.

Allen, A. G., Baxter, P. J. & Ottley, C. J. (2000) 'Gas and particle emissions from Soufriere Hills Volcano, Montserrat, West Indies: characterization and health hazard assessment', Bulletin of Volcanology, 62(1), 8-19.

Milford, C., Sutton, M.A., Allen, A.G., James, J.D., Karlsson, A., Davison, B.M., Rosman, K., Harrison R.M. and Cape J.N. (2000) ‘Marine and land-based influences on atmospheric ammonia and ammonium over Tenerife’, Tellus, 52B (2), 273-289.

Wang, Y., Allen, A., Mark D. and Harrison R. (1999) ‘Development of a personal monitoring method for nitrogen dioxide and sulfur dioxide using Sep-Pak C-18 cartridge sampling and ion chromatographic determination’, J. Environ. Monit., 1, 423-426.

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Latest News


Download our pamphlets on preparing for ashfall and on the health hazards of ash. They are designed for mass distribution at the onset of new eruptions. They are now avaiable in English, Japanese, French Spanish, Portuguese, Swahili, Indonesian and Icelandic with Italian versions being available shortly. Please see our Pamphlets page for further infomation.





IVHHN has an article under the Guidelines tab which used to be called 'Recommended Face Masks'. This has now been updated to 'Information on face masks' and is an interim page whilst the Health Interventions in Volcanic Eruptions project investigates which types of respiratory protection are effective in protecting the general population from volcanic ash inhalation. Please note that the translations in Spanish, Japanese and Portuguese have not yet been updated.



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