Hi, I have these colored sputum all the time. After exercise and yoga especially. Then I nebulize and its sort of a clean up what sputum is left for the most part. I dont take antibiotics and my doctors encourage to rid my lungs of bacteria, this is what it is. I have been doing this for two years. I guess the good news is that my condition is not getting worse. My doctor said if it get worse, Ill have to have antibiotics. Good luck, Hal

Usually when I have an infection my sputum becomes greenish. And sometimes smells kind of rotten. However color alone cannot tell. Are you able to have a sputum culture done to determine your infection status? If I remember correctly you are not in the US.
Sue