My wife woke me up Wed. nite and said there was an ambulance in front of our barn. When i talked to the driver he said the neighbors CO detector went off. CO levels were over 50ppm. They were ok. Seems the wood stove backed up from a dirty chimney. Now for some history. They moved in 2 years ago. When i heard him sawing wood (spring 2017) i went over to chat. He was cutting green hickory,oak and maple. I asked him if he had dry wood to burn for winter 2017. He said what he was cutting would be dry enough to burn. I told him it should sit for at least 2 years. The property they bought has plenty of dead wood on it. The neighbor called me the next day to tell me what all the commotion was about. I offered to help him clean the chimney and stove but he declined. (i don't wear a black hat) He has the same brand of stove that i do and i told him how to clean it out and to make sure the door gasket was good. I told him i would show him proper burning of the stove but no response.