There's a calendar date selector which shows history. NYC, Chicago, and LA are strong CO emitters. SO2 is emitted by coal-fired pwerplants, ships (you can literally trace out shipping routes), and volcanos.
I hope so. Some people talk about singularity, others speculates about a great collapse. Maybe thes two just are different names of the one thing? Two sides of the same coin?
I think not, and
I hope that we will find a cure and come back to the point of balance.
Something also happens at the east coast of US. Is it a usual level of air pollution at that period?