• Change of traffic amount and air pollution as potential negative health factors after re-independence and in rapid economic growth period in TartuOrru, Hans; Kaasik, Marko; Antov, Dago; Forsberg, BertilSecond European Road Transport Arena TRA 2008 : Ljubljana, Slovenia, 21-24 April 20082009 / p. 315
• Change of traffic flows and air pollution exposure in transitional country EstoniaOrru, Hans; Kaasik, Marko; Antov, Dago; Forsberg, BertilEpidemology2007 / 5, Suppl. : 19th Annual Conference of the International-Society-for-Environmental-Epidemiology, Mexico City, Sept. 05-09, 2007, p. S.35 https://bjrbe-journals.rtu.lv/article/view/1822-427X.2008.3.206-212
• Chemical properties of peat in three peatlands with balneological potential in EstoniaOrru, Mall; Übner, Monika; Orru, HansEstonian journal of earth sciences2011 / 1, p. 43-49 : ill https://artiklid.elnet.ee/record=b2284370*est
• Dependence of Estonian peat deposit properties on landscape types and feeding conditions = Eesti turba omaduste sõltuvus maastikutüüpidest ja turbalasundi toitumistingimustestOrru, Mall2010 https://www.ester.ee/record=b2636199*est
• Evolution of traffic flows and traffic-induced air pollution due to structural changes and development during 1993-2006 in Tartu (Estonia)Orru, Hans; Kaasik, Marko; Antov, Dago; Forsberg, BertilThe Baltic journal of road and bridge engineering2008 / 4, p. 206-216 https://www.researchgate.net/publication/245443681_Evolution_of_Traffic_Flows_and_Traffic-Induced_Air_Pollution_Due_to_Structural_Changes_and_Development_During_1993-2006_in_Tartu_Estonia
• Human biomonitoring in the oil shale industry area in Estonia—overview of earlier programmes and future perspectivesOrru, Hans; Viitak, Anu; Herodes, Koit; Veber, Triin; Lukk, MärtenFrontiers in public health2020 / art. 582114, 8 p. : ill https://doi.org/10.3389/fpubh.2020.582114 https://www.scopus.com/sourceid/21100798718 https://www.scopus.com/record/display.uri?eid=2-s2.0-85096682831&origin=inward&txGid=2c99c3ff9edfe3d1d08d22dc7592aa69 https://jcr.clarivate.com/jcr-jp/journal-profile?journal=FRONT%20PUBLIC%20HEALTH&year=2022 https://www.webofscience.com/wos/woscc/full-record/WOS:000592199400001
• Liiklussageduse ja õhusaaste kui negatiivsete tervisefaktorite muutus taasiseseisvumise ja kiire majanduskasvu perioodil 1993-2006 TartusOrru, Hans; Kaasik, Marko; Antov, Dago; Merisalu, EdaEesti Arst2007 / 7, lk. 687 https://artiklid.elnet.ee/record=b1060058*est
• Revegetation processes and environmental conditions in Estonian abandoned peat production peat fieldsOrru, Mall; Orru, HansEuru GEO 2009 Assamble, Austria, Vienna, April, 20092009 / ? p
• Re-vegetation processes in cutaway peat production fields in Estonia in relation to peat quality and water regimeOrru, Mall; Ots, Katri; Orru, HansEnvironmental monitoring and assessment2016 / art. 655, p. 1-12 : ill https://doi.org/10.1007/s10661-016-5669-5 https://www.scopus.com/sourceid/21482 https://www.scopus.com/record/display.uri?eid=2-s2.0-84994517604&origin=inward&txGid=051c5a9b66ea0c93376a5ec00ecb6a3a https://jcr.clarivate.com/jcr-jp/journal-profile?journal=ENVIRON%20MONIT%20ASSESS&year=2016 https://www.webofscience.com/wos/woscc/full-record/WOS:000388805000002
• Sustainable use of Estonian peat reserves and environmental challengesOrru, Mall; Orru, HansEstonian journal of earth sciences2008 / 2, p. 87-93 : ill https://artiklid.elnet.ee/record=b2384499*est
• Teadlased: praegune 5G on sama ohtlik kui wifi. Tulevikus võib olla teisiti : Riigikogu sotsiaalkomisjon hakkab homme arutama juba teist rahvaalgatust, mis üritab tõrjuda 5G-dParksepp, AnetteEesti Päevaleht2020 / Lk. 4-5 : ill https://www.ester.ee/record=b1072079*est
• The resources and properties of Estonian balneological peatOrru, Hans; Orru, Mall; Tuulik-Leisi, Varje-Riin; Übner, MonikaAchievements and Prospects of Humic Substances Applications : Dnepropetrovsk, Ukraine, 19-23 February 20082008 / ? p
• Variation of indoor/outdoor particulates in Tallinn, Estonia – the role of ventilation, heating systems and life-styleOrru, Hans; Mikola, Alo; Upan, Madis; Kõiv, Teet-AndrusJournal of environment pollution and human health2014 / p. 52-57 : ill
• Wood and municipal solid waste emissions from the household stovesKupri, Hanna-Lii; Maasikmets, Marek; Teinemaa, Erik; Vainumäe, Keio; Arumäe, Tarvo; Orru, Hans; Kimmel, VeljoHandbook : EAC 2015, European Aerosol Conference 2015 : 6-11 September 20152015 / p. 79