What is worse on COPD patients Dew Point or Humidity?
Humidly percentage is a simplistic weather statistic. Evey 17 degrees the capacity of the air to hold water doubles. Dew point accounts for a lot more weather physics. Research on google.
In general when the dew point inters the 60's and certainly the 70's it will be hard for a person with COPD to breath.
We do see patients with COPD having various grades of clubbing. Most of them (>95%) do not show any evidence of lung cancer or associated ILD on X-ray or HRCT. All of these patients had low SpO2 and low DLCO. Probably chronic hypoxia leads to clubbing in COPD patients. Interestingly I never saw a severe asthma patient with chronic hypoxia developing clubbing.