Thanks for joining the forum, nice to see that partners (spouses) are interested in learning more to help the other! Great questions. I must say before I respond that I am not a doctor or medical professional of any kind, this is just my thoughts and being a COPD patient also. First of all, to get COPD you do not have to be a smoker, former smoker or even exposed to 2nd hand smoke, that is what the experts say is the #1 cause of most cases. There is many causes, by what you wrote, your husband has asthma, thus could be the start of it all. May I suggest you do a google search or search webmd or mayoclinic they can explain it better then I can. Then with your husbands employment that could have been a source of contributing factors of the COPD. The dirt / dust flying around in the sawmill, breathing in the dirty air his lungs just got tried of fighting it or to weak to continue to fight it off, snuck up on him slowly and made it hard for him to realize, not to mention if outside working around those big machines and their exhaust along with the dirt/dust. These items would have irritated the asthma, causing inflammation in the lungs, thus causing damage eventually. As for the percentage or capacity, your figuring is correct, this is done by several test that they would have done on your husband more then likely at the Doctors office, the testing is called Pulmonary Function Test. I had one many moons ago with hardly any loss. This last one a year ago showed me at 29%. I am on oxygen at 2 liters at night only, but available if needed during the day. Depression, that is common in people that have chronic diseases, hopefully your hubby is getting help for that, usually meds and sometimes talk therapy. Keep in mind he is going through a grieving process for he has lost part of himself and so many chances to what he could do compared to what he can do now. Please also keep in mind that you to can suffer from the same as you see him change, if you notice you are getting a little overwhelmed and feeling depressed, please chat with your doctor about it too! Something I strongly suggest is go with him to his next appointment and go in the room with him if he will let you, ask his medical care team questions and care tips, even make a list to keep you on track, take notes etc.. It would be helpful for both of you. There even could be dietary changes that you can discuss or search on the internet for to help with what might trigger another attack. I so hope you will keep us posted and seek us out if you are even just needing to talk or vent. Best to you, Doris