So a lot of dirt was stirred up resulting in inhaled particles of somethings. Soil bacteria or fungus. Or both. Copd presents that way with fungus if it persists after antibiotic treatment. Diesel particulates would after a very long term not in a short termOne thing I did remember though, is the neighbor has an old John Deere which really puts out some major diesel exhaust. He went round and round their pasture, while bush-hogging his own pasture. His machine really puts out a LOT of noxious smoke. There's not a lot I can do about that till next time and move the horses.