Teko is correct. You are on the low side of moderate.
What is the lowest % of lung capacity a person can have?
Severity of COPD FEV1 % predicted
Mild ≥80
Moderate 50–79
Severe 30–49
Very severe <30 or Chronic respiratory failure symptoms
Anything above 40% is moderate to low, in your case it is most likely you are in the moderate stage of the disease.
it is a very progressive disease if you are a smoker things can happen cery quickly