I can't find the link to the actual study. What I'd like to know is whether there was any research into the actual causal relationships (such as the other study that was linked with pollution particles found in brains), or if it was just statistical correlation between places with high pollution and places with high levels of depression and suicide. If the latter, it could well be a spurious correlation (e.g. pollution happens in big cities, people in big cities tend to have more stressful jobs, stressful jobs cause burnout and depression...)
