Do ważniejszych zaliczyć można: XIX World Congress IUFRO – Kanada 1990; Nutrient Uptake and Cycling in Forest Ecosystems – Szwecja 1993; International Symposium on Vegetation Stress – Niemcy 1995; Acid rain 2000 – Japonia 2000; Forest under changing climate, enhance UV and air pollution – Finlandia 2004; Transformation to continuous cover forestry in a changing environment – Walia 2004; Acid Rain 2005 – Czechy 2005; 10th SCANDINAVIAN SYMPOSIUM ON CHEMOMETRICS – Finlandia 2007; 23rd IUFRO Conference for Specialists in Air Pollution and Climate Change Effects on Forest Ecosystems – Air Pollution and Climate Change at Contrasting Altitude and Latitude – Szwajcaria 2008; IUFRO Conference Adaptation of Forest Ecosystems to Air Pollution and Climate – Turcja; IUFRO Conference – Biological reactions of forest to climate change and air pollution – Litwa 2012.
Staże naukowe Odbył 2 staże naukowe: w Lund University (4 miesiące) w ramach Swedish Institute oraz w NISK (9 miesięcy) w ramach NAVF – Norwegian Research Council for Science and the Humanities.