In NYC the overall pm 2.5 is really low, usually in the teens, so unless you live under a highway with your windows open its likely too little to affect suicide

In NYC the overall pm 2.5 is really low, usually in the teens, so unless you live under a highway with your windows open its likely too little to affect suicide rates. There are probably other air pollutants in NYC but that could be true of rural areas working in agriculture/heavy industry as well. I imagine many US big cities follow this pattern except for a few unlucky places.