The present invention provides methods for diagnosing a patient with emphysema or COPD by detecting the levels of EMAP II in a sample. Alternatively, methods are provided for determining the susceptibility of a patient to develop emphysema or COPD by detecting the levels of EMAP II in a sample. The levels of EMAP II may be determined by immunoassay techniques. The present invention also provides methods for treating patients with emphysema or COPD by administering a therapeutically effective amount of an EMAP II neutralizing compound. The compound may be an antibody, siRNA, antisense RNA or an antagonist of CXCR3.