Environmental Science
The Gulf Coast states are more humid in summer than the coastal areas of Southern California mainly because of the:

Lower air temperature in Southern California
Low relative humidity of the air over the Pacific Ocean
Higher water temperature in the Gulf of Mexico
Higher air temperature in the Gulf States

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Environmental Science
Much of Tibet lies at altitudes over 18,000 feet where the pressure is about 500 mb. At such altitudes, the Tibetans are above roughly:

10% of the air molecules in the atmosphere
75% of the air molecules in the atmosphere
50% of the air molecules in the atmosphere
25% of the air molecules in the atmosphere

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