Olivier Jolliet's research and teaching programs aim to provide the scientific knowledge for assessing environmental risks and impacts of chemicals, in order to develop a flexible risk assessment framework, enabling specialist to contribute to an interdisciplinary comparative approach, from chemical emissions to risks and impacts; to model population-based exposure and intake fractions for outdoor and indoor chemical emissions in a consistent way; to assess the life cycle risks, impacts and benefits related to new technologies and materials in order to prevent emissions and guide the development of these technologies.