Tallinn Technical University, Swedish Environmental Protection Agency; [Arvo Iital, Enn Loigu, Irina Blinova, Ülle Leisk, Harald-Adam Velner, Valdu Suurkask, Ain Lääne, Maret Merisaar, Svetlana Krutova et al.; preface by Rune Frisen, Harald-Adam Velner]