Just a few notes. First of all, I have been diagnosed with Pigeon Lung Disease by several doctors (also known as Bird Breeders Disease and Bird Lung Disease), and was told that the only sure fire way to beat it, is to get rid of pigeons.
I did. Twenty five years ago, but I always kept parrots and suffered from them as well. Although not as bad. The pigeons were always in a loft but the parrots were always in the house, so it should have been worse, but it wasn't.
Many parrots are extremely worse for this condition. Cockatiels and Cockatoo's are the worse.
I now keep my parrots (African Greys) in another building and I wear a mask when I go in there to take care of them It seems to work but is a hassle. I have fans in the windoes to remove air out but can not use them in the winter months due to the parrots not being able to take the cold and draft. As a matter of fact, I have to heat that building during the winter, so fans are not an option then.
This also affects pigeon keeping in the winter. With birds, drafts can be a killer. Pigeons can take the cold pretty well, but if one uses fans in the lofts during the winter months, wouldn't this be bad for the birds? Especially with open floors or walls?
I have tried many things to deal with this problem and the only thing that works well, is wearing a mask whenever I am around them. But I have not figured out what to do at the "club" when birds are being around. Wearing a mask would be the thing to do of course, but I would feel silly doing it.
When I take the birds for training flights, I have them in the bed of a pickup truck, because if I put them in the back seat of a car, I get sick. More so if the car windoes are open, which causes the bloom (dander) to fly around a lot.
Back twenty five years or so ago, when I first came down with this problem, the University of Wisconsin was doing research into the problem, but I have not found any info as to their conclusions. They were looking for volunteers with the disease back then. Since they were so far away, I did not volunteer.
I do not put much faith in eating more fat nor taking vitamins and supplements, etc, to combat this disease.
Researching this disease, info is that this disease is not something you are born with, but rather you acquire it over time of being exposed. It is an acquired allergy. Research also indicates that some people are lucky and never get it at all, but that many get it in various degrees. Some get it real bad and it can become chronic. Those types will suffer breathing problems for the rest of their lives once it becomes chronic. Some that do not become chronic, suffer while they are around pigeons but if they stop (or take measures to prevent heavy exposure) just suffer from being exposed and do not become chronic.
The official web sites concerning this disease recommends that masks always be worn (masks as described above) and that loft coats and hats be worn, when around pigeons. That is so the loft coats and hats can be left outside, and the dander (bloom) will not be brought into the house or in someones hair and on them until they take a bath. When you think about it, if the bloom is on your hair and you comb your hair, the "stuff" is dropping right into your airway, or it is on your pillow. The official web sites also recommend that open air lofts be used, instead of lofts with four walls. They recommend that a loft basically be a very large bird cage, with nesting/perching boxes inside it so that the birds can get out of the weather, but when you are in there, you are basically in an open area. I have one loft like that but I have another that is more traditional.
I use the mask. I do not use the loft coat nor hat (yet). When I get a "dose" of pigeon bloom, I get a bad cough for several days. This is always when I fail to use my mask.
Reminds me of when I was dating my wife of 36 years (started dating when I was ten and she was 7, and been together ever since). We were teenagers and she broke out in hives (itchy blotches all over her body), and the skin specialist doctor her parents took her to, stated that she was allergic to ME! It seems that because I was putting so much pressure on her for sexual favors, that she broke out in hives due to stress. I only mention this because two things I love in life, had something in common. I made her suffer and the birds make me suffer

(my wife hasn't suffered hives since she was 17)
I am now almost 56. I do not know if the birds will kill me sooner rather than later, but I ain't gonna get out of this life alive anyway. None of us are. So I am going to have racing pigeons until I can not.
Oh. One more thing. I tried "Hepa" filtering machines and they did not work. Apparently they do not filter particles small enough to help. I also wonder about using fans, since they actually throw the "stuff" around your loft, yard, property, etc. If the fans are going and you are in the back yard anywhere near your loft/s, wouldn't that be a bad thing?
It is a quandry for sure.