I was diagnosed about 2 weeks ago with the same thing. Calcified just means scarred over from a former infection. It is calcified making it a round-like rock in the lung, no problems or pain occurs. It is non-cancerous because it is not to spread.
No worries.
These x-ray findings may or may not be from dust exposure. The good news for you and your husband, as a first responder, is that these are the only findings on his X-ray. Assuming that the parenchymal scar is small, as usual when reported this way, and with features strongly suggestive of a scar, rather than a solitary nodule or "coin lesion", the odds are very high that this "scar" is benign. The same can be said of the calcified granuloma. With very rare exceptions, calcification is a strong indicator that a lesion is benign. Basically, these x-ray findings do not suggest cancer.
You still need to discuss these x-ray findings with your husband's doctor. If not already performed, your husband should have spirometry done. This is a simple breathing test that will provide detailed information about how his lungs are working. It will assess any damage from his exposure on 9/11.
Thank you very much for your response. A Happy and Healthy New Year to you and yours.