There are multiple resources available to obtain reliable information about different pulmonary diseases.
1) The American Thoracic Society (ATS) has a website with educational resources for patients at http://patients.thoracic.org/information-series/
2) UpToDate is an online medical information resource where patients can go to learn about a medical condition, better understand management and treatment options, and find information to have a better dialogue with their healthcare providers. UpToDate provides in-depth, authoritative medical information, including recommendations based on the latest published evidence. Patients can view hundreds of free patient-level topics or subscribe to gain access to thousands of physician-level topics. UpToDate is the trusted resource of physicians around the world and is used by the majority of academic medical centers in the US. Visit them at www.uptodate.com/patients