"Air pollution doesn't just make it hard to breathe – it may also increase the risk that people will take their own lives. A new study in seven cities across South Korea has uncovered a clear association between suicide and spikes of particulate pollution. Meanwhile, researchers who in the 1990s linked air pollution to asthma in a large group of Taiwanese children have now found that those with the condition were subsequently more likely to have killed themselves." (Quoted from article)