How to help the lungs???

My 14 yr old son has been suffering with a constant cough for months. I know it is because we bought a house and did major renovations to it, which he helped out with. So, I suspect he has dust and debris accumulated in his lungs. He did not wear a mask. Last week while playing soccer, he chested a ball and it caused him to cough up blood. Does anyone have any suggestions for aiding the lungs in ridding him of this bacteria in there? Tweet