• Luts, A. and Salm, J. (1992) Modeling of the evolution of small tropospheric ions. Acta et comm. Univ. Tartuensis 947, 5-23.
• Parts, T. and Salm, J. (1992) The effect of pyridine and its homologues on mobility spectra of positive small air ions. Acta et Comm. Univ. Tartuensis 947, 24-30.
• Salm, J. and Reinart, M. (1992) Measurement of air ion mobility spectra in a wide range. Acta et Comm. Univ. Tartuensis 947, 31-34.
• Tammet, H., Iher, H. and Salm, J. (1992) Spectrum of atmospheric ions in the mobility range of 0.32-3.2 cm2/(V·s). Acta et Comm. Univ. Tartuensis 947, 35-49.
• Salm, J., Tammet, H., Iher, H. and Hõrrak, U. (1992) The dependence of small air ion mobility spectra in the ground layer of the atmosphere on temperature and pressure. Acta Comm. Univ. Tartuensis 947, 50-56.
• Arold, M.U. and Matisen, R. (1992) Atmospheric electricity at the prospective Borovoye background monitoring station. Acta et comm. Univ. Tartuensis 947, 57-59.
• Matisen, R., Miller, F., Tammet, H. and Salm, J. (1992) Air ion counters and spectrometers designed in Tartu University. Acta et Comm. Univ. Tartuensis 947, 60-67.
• Salm, J. (1992) On unipolar charging of initially charged aerosols. Acta et Comm. Univ. Tartuensis 947, 68-71.
• Peil, I., Tamm, E. and Zubchenko, P. (1992) Generation of a narrow bipolar charge distribution on aerosol particles. Acta et Comm. Univ. Tartuensis 947, 72-79.
• Tamm, E., Mirme, A. and Kikas, Ü. (1992) Corona discharge as a generator of nanometer-range monodisperse aerosol. Acta et Comm. Univ. Tartuensis 947, 80-88.
• Tamme, V. (1992) Dispersion of droplet stream in vibrating orifice aerosol generator. Acta et Comm. Univ. Tartuensis 947, 89-93.
• Tammet, H. (1992) On the techniques of aerosol electrical granulometry. Acta et Comm. Univ. Tartuensis 947, 94-115.
• Tammet, H. and Noppel, M. (1992) Principles of the graduation of an electric aerosol granulometer. Acta et Comm. Univ. Tartuensis 947, 116-124.
• Kikas, Ü., Kimmel, V. and Mirme, A. (1992) Spectra of near-ground atmospheric aerosols. Acta et Comm. Univ. Tartuensis 947, 125-135.
• Tammet, H. (1992) Comparison of model distributions of aerosol particle sizes. Acta et Comm. Univ. Tartuensis 947, 136-149.
• Tammet, H. (1992) Electrical parameters of air pollution. Acta et Comm. Univ. Tartuensis 947, 150-153.
• Tammet, H. (1992) Notes on the interpretation of aerosol electrical density. Acta et Comm. Univ. Tartuensis 947, 154-159.
• Langus, L. and Tammet, H. (1992) List of publications of Tartu University on air electricity in 1986-1991. Acta et comm. Univ. Tartuensis 947, 160-172.

Systematic research in air electricity at Tartu University has been going on over forty years. An English-language survey of the history of the Air Electricity Laboratory (AEL) and a bibliography of publications up to 1985 (761 titles) can be found in the book [Ionizaciya, aerozoli, elektrometriya. Bibliograficheskii ukazatel nauchnyh publikacii Tartuskogo gosudarstvennogo universiteta za 1946-1985 gg. Tartu, 1986]. A greater part of the scientific results of AEL has been published in Russian and in publications relatively little known to the scientific community at large. Since 1990 the results of AEL are published mainly in English. Most of the recent results of AEL are to a significant extent based on earlier publications and without this information several questions might arise in reading the recent papers.

To remedy the situation AEL has decided to publish a collection of English-language translations and summaries of its early papers which have originally been published in Russian. However, the present collection dealing with air ion and aerosol science does not reflect the whole range of research carried out in AEL.

The collection contains two types of papers: unchanged translations, and surveys written specially for this volume. A respective note can be found at the end of all translated articles. It is recommended to refer to the original publication in the cases of unchanged translations, and to this volume in other cases.

The collection also contains a bibliography of AEL's recent titles, which is a sequel of the above book. As in the above book the Estonian and Russian titles are provided with English translations. Differently from the above book only papers on air ions and aerosols are listed.

The editor wishes to thank Mati Limberg for his help in translating the articles and Karmen Veldre for her typing.

Tartu, February, 1992
Jaan Salm and Hannes Tammet