A 45 yrs old with h/o chronic bronchtis showing SPO2 between 94-97 percent ,is it expected?pt is able to brisk walk for around 1 km,his pft computer report lable him as restrictive lung pattern. he is having seasonal cough for last 10 years in winter.he is non smoker,every winter he used to have dry cough for 2-3 months , but this winter he had cough with wheeze relieved after taking steroid inhaler and motilekast