Formulas used and UV Index Missing

I have acquired some datasets from your website. I am wondering:
  1. If the "humidity" term is relative humidity or absolute humidity.
  2. What formula is being used to go from the station's barometric pressure to sea level pressure?
  3. What formula is used to calculate "feels like" temperature from the regular "temp"?
  4. Why is the UV index missing until 2018? 
Many thanks in advance!


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