http://goo.gl/g0kUri
This is not the first study to find a link between air pollution and increased risk of suicide. A 2010 studypublished in The American Journal of Psychiatry found people from over seven cities in South Korea were 9% more likely to commit suicide within 2 days of a rise in air pollution.
And last year, Bakian and colleagues conducted a study that found residents of Salt Lake County were more likely to commit suicide within 3 days of being exposed to increased levels of nitrogen oxide or high concentrations of fine particulate matter (PM 2.5) - particles in smoke and haze that are 2.5 micrometers in diameter or less.
They build on these findings with their latest study, which found middle-aged individuals and men are most at risk of suicide through exposure to air pollution.