My reasearch is about the effect of environmental hazards on health. The research involves conducting systematic literature studies and meta- analyses of exposure-response relationships between environmental stressors and health outcomes. I am also looking at the effect of long term exposure of air pollution on dementia. I have investigated about the joint effects of physical activity and long-term exposure of air pollution on both cardiovascular disease and survival after illness due to cardiovascular disease. I want to find out, whether long term exposure of air pollution modifies the beneficial impact of physical activity and, on the contrary, whether physical activity such as leisure time and active commuting, negates the harmful effects of air pollution. Knowing this will support the adoption of strategies to improve health through physical activity promotion and air pollution mitigation.