This show is about an event where people living the north-east of US were suddenly affected by some kind of mysterious nerve poisoning gas causing them to commit suicide. It spread quickly towards the west and south.
Many people tried desperately to run away from the affected regions, including a family. While escaping, they guessed that the poisoning gas originated from plants, trees and vegetations, when the wind blows, that is when it is lethal. Strangly, the family is not affected by this, not like the rest. It ended a week later.
This is more like a love story, being a teacher, the man of the family, trying to patching up to his wife, who before that didn't want to have a child and was involved in a mistaken relationship with another man.
The story didn't tell us much about what really happened, scientists only suspect the green plants and floras are giving a warning, maybe if humanity still continues to destroy them, this may be what is going to happen.
End of story, the camera moves to another country, it happens again....