Hmm...I just read this on mayoclinic.com as one of the risk factors:

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Are exposed to certain chemicals or pollutants. Your risk of developing some uncommon types of pneumonia may be increased if you work in agriculture, construction or around certain industrial chemicals or animals. Exposure to air pollution or toxic fumes can also contribute to lung inflammation, which makes it harder for the lungs to clear themselves.

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But I'm confused, because he specifically asked the doctor about the construction going on at his work. He works at a retail store and they are remodeling, and they have been tearing out concrete, so there is tons of dust all over, but he has to work thru it. We originally thought his cough was related to that. So....I guess it's possible that the dust fragments got into his lungs and caused the infection? Why would the doctor say that it wasn't related? Hmm...

I just hope he's okay. I am feeling soooooooo incredibly guilty seeing him suffer. I'm doing everything I can to help him but I just hate to see him in so much pain.