Hi I did review your concern. Extrinsic allergic alveolitis is also known as hypersensitivity pneumonitis and it represent allergic reaction to dust and organic matter. it occurs to people with occupations involving a lot of interaction with birds and animals, sugarcane and other vegetable products,coffee bean dust, fungal exposure from mist of water coming out of machine and so on. Fall or lipitor should usually not cause this condition. The best way is to review with a pulmonologist and analyse your husbands occupation and your household surrounding environment for a potential allergen that could have caused it. Once you identify the cause then proper preventive measures can be taken to remove its exposure and prevent progression. I hope this helps Wish you all the best. thank you for using healthcare magic.